Swagger info corrections (#9441)

* use numbers and not http.Status___ enum

* fix test

* add many missing swagger responses

* code format

* Deletion Sould return 204 ...

* error handling improvements

* if special error type ... then add it to swagger too

* one smal nit

* invalidTopicsError is []string

* valid swagger specification 2.0
 - if you add responses swagger can tell you if you do it right :+1:

* use ctx.InternalServerError

* Revert "use numbers and not http.Status___ enum"

This reverts commit b1ff386e24.

* use http.Status* enum everywhere

modules/context/api.go

 	URL     string `json:"url"`
 }
 
+// APIInvalidTopicsError is error format response to invalid topics
+// swagger:response invalidTopicsError
+type APIInvalidTopicsError struct {
+	Topics  []string `json:"invalidTopics"`
+	Message string   `json:"message"`
+}
+
 //APIEmpty is an empty response
 // swagger:response empty
 type APIEmpty struct{}

routers/api/v1/admin/org.go

 package admin
 
 import (
+	"net/http"
+
 	"code.gitea.io/gitea/models"
 	"code.gitea.io/gitea/modules/context"
 	"code.gitea.io/gitea/modules/convert"
 	//     "$ref": "#/responses/forbidden"
 	//   "422":
 	//     "$ref": "#/responses/validationError"
+
 	u := user.GetUserByParams(ctx)
 	if ctx.Written() {
 		return
 		if models.IsErrUserAlreadyExist(err) ||
 			models.IsErrNameReserved(err) ||
 			models.IsErrNamePatternNotAllowed(err) {
-			ctx.Error(422, "", err)
+			ctx.Error(http.StatusUnprocessableEntity, "", err)
 		} else {
-			ctx.Error(500, "CreateOrganization", err)
+			ctx.Error(http.StatusInternalServerError, "CreateOrganization", err)
 		}
 		return
 	}
 
-	ctx.JSON(201, convert.ToOrganization(org))
+	ctx.JSON(http.StatusCreated, convert.ToOrganization(org))
 }
 
 //GetAllOrgs API for getting information of all the organizations
 	//     "$ref": "#/responses/OrganizationList"
 	//   "403":
 	//     "$ref": "#/responses/forbidden"
+
 	users, _, err := models.SearchUsers(&models.SearchUserOptions{
 		Type:     models.UserTypeOrganization,
 		OrderBy:  models.SearchOrderByAlphabetically,
 		Private:  true,
 	})
 	if err != nil {
-		ctx.Error(500, "SearchOrganizations", err)
+		ctx.Error(http.StatusInternalServerError, "SearchOrganizations", err)
 		return
 	}
 	orgs := make([]*api.Organization, len(users))
 	for i := range users {
 		orgs[i] = convert.ToOrganization(users[i])
 	}
-	ctx.JSON(200, &orgs)
+	ctx.JSON(http.StatusOK, &orgs)
 }

routers/api/v1/admin/repo.go

 	//     "$ref": "#/responses/Repository"
 	//   "403":
 	//     "$ref": "#/responses/forbidden"
+	//   "404":
+	//     "$ref": "#/responses/notFound"
+	//   "409":
+	//     "$ref": "#/responses/error"
 	//   "422":
 	//     "$ref": "#/responses/validationError"
+
 	owner := user.GetUserByParams(ctx)
 	if ctx.Written() {
 		return

routers/api/v1/admin/user.go

 
 import (
 	"errors"
+	"net/http"
 
 	"code.gitea.io/gitea/models"
 	"code.gitea.io/gitea/modules/context"
 	source, err := models.GetLoginSourceByID(sourceID)
 	if err != nil {
 		if models.IsErrLoginSourceNotExist(err) {
-			ctx.Error(422, "", err)
+			ctx.Error(http.StatusUnprocessableEntity, "", err)
 		} else {
-			ctx.Error(500, "GetLoginSourceByID", err)
+			ctx.Error(http.StatusInternalServerError, "GetLoginSourceByID", err)
 		}
 		return
 	}
 	//     "$ref": "#/responses/User"
 	//   "403":
 	//     "$ref": "#/responses/forbidden"
+	//   "400":
+	//     "$ref": "#/responses/error"
 	//   "422":
 	//     "$ref": "#/responses/validationError"
+
 	u := &models.User{
 		Name:               form.Username,
 		FullName:           form.FullName,
 	}
 	if !password.IsComplexEnough(form.Password) {
 		err := errors.New("PasswordComplexity")
-		ctx.Error(400, "PasswordComplexity", err)
+		ctx.Error(http.StatusBadRequest, "PasswordComplexity", err)
 		return
 	}
 	if err := models.CreateUser(u); err != nil {
 			models.IsErrEmailAlreadyUsed(err) ||
 			models.IsErrNameReserved(err) ||
 			models.IsErrNamePatternNotAllowed(err) {
-			ctx.Error(422, "", err)
+			ctx.Error(http.StatusUnprocessableEntity, "", err)
 		} else {
-			ctx.Error(500, "CreateUser", err)
+			ctx.Error(http.StatusInternalServerError, "CreateUser", err)
 		}
 		return
 	}
 	if form.SendNotify {
 		mailer.SendRegisterNotifyMail(ctx.Locale, u)
 	}
-	ctx.JSON(201, convert.ToUser(u, ctx.IsSigned, ctx.User.IsAdmin))
+	ctx.JSON(http.StatusCreated, convert.ToUser(u, ctx.IsSigned, ctx.User.IsAdmin))
 }
 
 // EditUser api for modifying a user's information
 	//     "$ref": "#/responses/forbidden"
 	//   "422":
 	//     "$ref": "#/responses/validationError"
+
 	u := user.GetUserByParams(ctx)
 	if ctx.Written() {
 		return
 	if len(form.Password) > 0 {
 		if !password.IsComplexEnough(form.Password) {
 			err := errors.New("PasswordComplexity")
-			ctx.Error(400, "PasswordComplexity", err)
+			ctx.Error(http.StatusBadRequest, "PasswordComplexity", err)
 			return
 		}
 		var err error
 		if u.Salt, err = models.GetUserSalt(); err != nil {
-			ctx.Error(500, "UpdateUser", err)
+			ctx.Error(http.StatusInternalServerError, "UpdateUser", err)
 			return
 		}
 		u.HashPassword(form.Password)
 
 	if err := models.UpdateUser(u); err != nil {
 		if models.IsErrEmailAlreadyUsed(err) {
-			ctx.Error(422, "", err)
+			ctx.Error(http.StatusUnprocessableEntity, "", err)
 		} else {
-			ctx.Error(500, "UpdateUser", err)
+			ctx.Error(http.StatusInternalServerError, "UpdateUser", err)
 		}
 		return
 	}
 	log.Trace("Account profile updated by admin (%s): %s", ctx.User.Name, u.Name)
 
-	ctx.JSON(200, convert.ToUser(u, ctx.IsSigned, ctx.User.IsAdmin))
+	ctx.JSON(http.StatusOK, convert.ToUser(u, ctx.IsSigned, ctx.User.IsAdmin))
 }
 
 // DeleteUser api for deleting a user
 	//     "$ref": "#/responses/forbidden"
 	//   "422":
 	//     "$ref": "#/responses/validationError"
+
 	u := user.GetUserByParams(ctx)
 	if ctx.Written() {
 		return
 	if err := models.DeleteUser(u); err != nil {
 		if models.IsErrUserOwnRepos(err) ||
 			models.IsErrUserHasOrgs(err) {
-			ctx.Error(422, "", err)
+			ctx.Error(http.StatusUnprocessableEntity, "", err)
 		} else {
-			ctx.Error(500, "DeleteUser", err)
+			ctx.Error(http.StatusInternalServerError, "DeleteUser", err)
 		}
 		return
 	}
 	log.Trace("Account deleted by admin(%s): %s", ctx.User.Name, u.Name)
 
-	ctx.Status(204)
+	ctx.Status(http.StatusNoContent)
 }
 
 // CreatePublicKey api for creating a public key to a user
 	//     "$ref": "#/responses/forbidden"
 	//   "422":
 	//     "$ref": "#/responses/validationError"
+
 	u := user.GetUserByParams(ctx)
 	if ctx.Written() {
 		return
 	//     "$ref": "#/responses/forbidden"
 	//   "404":
 	//     "$ref": "#/responses/notFound"
+
 	u := user.GetUserByParams(ctx)
 	if ctx.Written() {
 		return
 		if models.IsErrKeyNotExist(err) {
 			ctx.NotFound()
 		} else if models.IsErrKeyAccessDenied(err) {
-			ctx.Error(403, "", "You do not have access to this key")
+			ctx.Error(http.StatusForbidden, "", "You do not have access to this key")
 		} else {
-			ctx.Error(500, "DeleteUserPublicKey", err)
+			ctx.Error(http.StatusInternalServerError, "DeleteUserPublicKey", err)
 		}
 		return
 	}
 	log.Trace("Key deleted by admin(%s): %s", ctx.User.Name, u.Name)
 
-	ctx.Status(204)
+	ctx.Status(http.StatusNoContent)
 }
 
 //GetAllUsers API for getting information of all the users
 	//     "$ref": "#/responses/UserList"
 	//   "403":
 	//     "$ref": "#/responses/forbidden"
+
 	users, _, err := models.SearchUsers(&models.SearchUserOptions{
 		Type:     models.UserTypeIndividual,
 		OrderBy:  models.SearchOrderByAlphabetically,
 		PageSize: -1,
 	})
 	if err != nil {
-		ctx.Error(500, "GetAllUsers", err)
+		ctx.Error(http.StatusInternalServerError, "GetAllUsers", err)
 		return
 	}
 
 		results[i] = convert.ToUser(users[i], ctx.IsSigned, ctx.User.IsAdmin)
 	}
 
-	ctx.JSON(200, &results)
+	ctx.JSON(http.StatusOK, &results)
 }

routers/api/v1/api.go

 package v1
 
 import (
+	"net/http"
 	"strings"
 
 	"code.gitea.io/gitea/models"
 					if models.IsErrUserNotExist(err) {
 						ctx.NotFound()
 					} else {
-						ctx.Error(500, "GetUserByName", err)
+						ctx.Error(http.StatusInternalServerError, "GetUserByName", err)
 					}
 					return
 				}
 				log.Trace("Sudo from (%s) to: %s", ctx.User.Name, user.Name)
 				ctx.User = user
 			} else {
-				ctx.JSON(403, map[string]string{
+				ctx.JSON(http.StatusForbidden, map[string]string{
 					"message": "Only administrators allowed to sudo.",
 				})
 				return
 				if models.IsErrUserNotExist(err) {
 					ctx.NotFound()
 				} else {
-					ctx.Error(500, "GetUserByName", err)
+					ctx.Error(http.StatusInternalServerError, "GetUserByName", err)
 				}
 				return
 			}
 				} else if models.IsErrRepoRedirectNotExist(err) {
 					ctx.NotFound()
 				} else {
-					ctx.Error(500, "LookupRepoRedirect", err)
+					ctx.Error(http.StatusInternalServerError, "LookupRepoRedirect", err)
 				}
 			} else {
-				ctx.Error(500, "GetRepositoryByName", err)
+				ctx.Error(http.StatusInternalServerError, "GetRepositoryByName", err)
 			}
 			return
 		}
 
 		ctx.Repo.Permission, err = models.GetUserRepoPermission(repo, ctx.User)
 		if err != nil {
-			ctx.Error(500, "GetUserRepoPermission", err)
+			ctx.Error(http.StatusInternalServerError, "GetUserRepoPermission", err)
 			return
 		}
 
 			ctx.RequireCSRF()
 			return
 		}
-		ctx.Context.Error(401)
+		ctx.Context.Error(http.StatusUnauthorized)
 	}
 }
 
 func reqBasicAuth() macaron.Handler {
 	return func(ctx *context.APIContext) {
 		if !ctx.Context.IsBasicAuth {
-			ctx.Context.Error(401)
+			ctx.Context.Error(http.StatusUnauthorized)
 			return
 		}
 		ctx.CheckForOTP()
 func reqSiteAdmin() macaron.Handler {
 	return func(ctx *context.Context) {
 		if !ctx.IsUserSiteAdmin() {
-			ctx.Error(403)
+			ctx.Error(http.StatusForbidden)
 			return
 		}
 	}
 func reqOwner() macaron.Handler {
 	return func(ctx *context.Context) {
 		if !ctx.IsUserRepoOwner() && !ctx.IsUserSiteAdmin() {
-			ctx.Error(403)
+			ctx.Error(http.StatusForbidden)
 			return
 		}
 	}
 func reqAdmin() macaron.Handler {
 	return func(ctx *context.Context) {
 		if !ctx.IsUserRepoAdmin() && !ctx.IsUserSiteAdmin() {
-			ctx.Error(403)
+			ctx.Error(http.StatusForbidden)
 			return
 		}
 	}
 func reqRepoWriter(unitTypes ...models.UnitType) macaron.Handler {
 	return func(ctx *context.Context) {
 		if !ctx.IsUserRepoWriter(unitTypes) && !ctx.IsUserRepoAdmin() && !ctx.IsUserSiteAdmin() {
-			ctx.Error(403)
+			ctx.Error(http.StatusForbidden)
 			return
 		}
 	}
 func reqRepoReader(unitType models.UnitType) macaron.Handler {
 	return func(ctx *context.Context) {
 		if !ctx.IsUserRepoReaderSpecific(unitType) && !ctx.IsUserRepoAdmin() && !ctx.IsUserSiteAdmin() {
-			ctx.Error(403)
+			ctx.Error(http.StatusForbidden)
 			return
 		}
 	}
 func reqAnyRepoReader() macaron.Handler {
 	return func(ctx *context.Context) {
 		if !ctx.IsUserRepoReaderAny() && !ctx.IsUserSiteAdmin() {
-			ctx.Error(403)
+			ctx.Error(http.StatusForbidden)
 			return
 		}
 	}
 		} else if ctx.Org.Team != nil {
 			orgID = ctx.Org.Team.OrgID
 		} else {
-			ctx.Error(500, "", "reqOrgOwnership: unprepared context")
+			ctx.Error(http.StatusInternalServerError, "", "reqOrgOwnership: unprepared context")
 			return
 		}
 
 		isOwner, err := models.IsOrganizationOwner(orgID, ctx.User.ID)
 		if err != nil {
-			ctx.Error(500, "IsOrganizationOwner", err)
+			ctx.Error(http.StatusInternalServerError, "IsOrganizationOwner", err)
 			return
 		} else if !isOwner {
 			if ctx.Org.Organization != nil {
-				ctx.Error(403, "", "Must be an organization owner")
+				ctx.Error(http.StatusForbidden, "", "Must be an organization owner")
 			} else {
 				ctx.NotFound()
 			}
 			return
 		}
 		if ctx.Org.Team == nil {
-			ctx.Error(500, "", "reqTeamMembership: unprepared context")
+			ctx.Error(http.StatusInternalServerError, "", "reqTeamMembership: unprepared context")
 			return
 		}
 
 		var orgID = ctx.Org.Team.OrgID
 		isOwner, err := models.IsOrganizationOwner(orgID, ctx.User.ID)
 		if err != nil {
-			ctx.Error(500, "IsOrganizationOwner", err)
+			ctx.Error(http.StatusInternalServerError, "IsOrganizationOwner", err)
 			return
 		} else if isOwner {
 			return
 		}
 
 		if isTeamMember, err := models.IsTeamMember(orgID, ctx.Org.Team.ID, ctx.User.ID); err != nil {
-			ctx.Error(500, "IsTeamMember", err)
+			ctx.Error(http.StatusInternalServerError, "IsTeamMember", err)
 			return
 		} else if !isTeamMember {
 			isOrgMember, err := models.IsOrganizationMember(orgID, ctx.User.ID)
 			if err != nil {
-				ctx.Error(500, "IsOrganizationMember", err)
+				ctx.Error(http.StatusInternalServerError, "IsOrganizationMember", err)
 			} else if isOrgMember {
-				ctx.Error(403, "", "Must be a team member")
+				ctx.Error(http.StatusForbidden, "", "Must be a team member")
 			} else {
 				ctx.NotFound()
 			}
 		} else if ctx.Org.Team != nil {
 			orgID = ctx.Org.Team.OrgID
 		} else {
-			ctx.Error(500, "", "reqOrgMembership: unprepared context")
+			ctx.Error(http.StatusInternalServerError, "", "reqOrgMembership: unprepared context")
 			return
 		}
 
 		if isMember, err := models.IsOrganizationMember(orgID, ctx.User.ID); err != nil {
-			ctx.Error(500, "IsOrganizationMember", err)
+			ctx.Error(http.StatusInternalServerError, "IsOrganizationMember", err)
 			return
 		} else if !isMember {
 			if ctx.Org.Organization != nil {
-				ctx.Error(403, "", "Must be an organization member")
+				ctx.Error(http.StatusForbidden, "", "Must be an organization member")
 			} else {
 				ctx.NotFound()
 			}
 func reqGitHook() macaron.Handler {
 	return func(ctx *context.APIContext) {
 		if !ctx.User.CanEditGitHook() {
-			ctx.Error(403, "", "must be allowed to edit Git hooks")
+			ctx.Error(http.StatusForbidden, "", "must be allowed to edit Git hooks")
 			return
 		}
 	}
 				if models.IsErrOrgNotExist(err) {
 					ctx.NotFound()
 				} else {
-					ctx.Error(500, "GetOrgByName", err)
+					ctx.Error(http.StatusInternalServerError, "GetOrgByName", err)
 				}
 				return
 			}
 				if models.IsErrUserNotExist(err) {
 					ctx.NotFound()
 				} else {
-					ctx.Error(500, "GetTeamById", err)
+					ctx.Error(http.StatusInternalServerError, "GetTeamById", err)
 				}
 				return
 			}

routers/api/v1/misc/markdown.go

 	//     "$ref": "#/responses/MarkdownRender"
 	//   "422":
 	//     "$ref": "#/responses/validationError"
+
 	if ctx.HasAPIError() {
-		ctx.Error(422, "", ctx.GetErrMsg())
+		ctx.Error(http.StatusUnprocessableEntity, "", ctx.GetErrMsg())
 		return
 	}
 
 		if form.Wiki {
 			_, err := ctx.Write([]byte(markdown.RenderWiki(md, urlPrefix, meta)))
 			if err != nil {
-				ctx.Error(http.StatusInternalServerError, "", err)
+				ctx.InternalServerError(err)
 				return
 			}
 		} else {
 			_, err := ctx.Write(markdown.Render(md, urlPrefix, meta))
 			if err != nil {
-				ctx.Error(http.StatusInternalServerError, "", err)
+				ctx.InternalServerError(err)
 				return
 			}
 		}
 	default:
 		_, err := ctx.Write(markdown.RenderRaw([]byte(form.Text), "", false))
 		if err != nil {
-			ctx.Error(http.StatusInternalServerError, "", err)
+			ctx.InternalServerError(err)
 			return
 		}
 	}
 	//     "$ref": "#/responses/MarkdownRender"
 	//   "422":
 	//     "$ref": "#/responses/validationError"
+
 	body, err := ctx.Req.Body().Bytes()
 	if err != nil {
-		ctx.Error(422, "", err)
+		ctx.Error(http.StatusUnprocessableEntity, "", err)
 		return
 	}
 	_, err = ctx.Write(markdown.RenderRaw(body, "", false))
 	if err != nil {
-		ctx.Error(http.StatusInternalServerError, "", err)
+		ctx.InternalServerError(err)
 		return
 	}
 }

routers/api/v1/misc/swagger.go

 package misc
 
 import (
+	"net/http"
+
 	"code.gitea.io/gitea/modules/base"
 	"code.gitea.io/gitea/modules/context"
 )
 // Swagger render swagger-ui page with v1 json
 func Swagger(ctx *context.Context) {
 	ctx.Data["APIJSONVersion"] = "v1"
-	ctx.HTML(200, tplSwagger)
+	ctx.HTML(http.StatusOK, tplSwagger)
 }

routers/api/v1/misc/version.go

 package misc
 
 import (
+	"net/http"
+
 	"code.gitea.io/gitea/modules/context"
 	"code.gitea.io/gitea/modules/setting"
 	"code.gitea.io/gitea/modules/structs"
 	// responses:
 	//   "200":
 	//     "$ref": "#/responses/ServerVersion"
-	ctx.JSON(200, &structs.ServerVersion{Version: setting.AppVer})
+	ctx.JSON(http.StatusOK, &structs.ServerVersion{Version: setting.AppVer})
 }

routers/api/v1/org/hook.go

 package org
 
 import (
+	"net/http"
+
 	"code.gitea.io/gitea/models"
 	"code.gitea.io/gitea/modules/context"
 	"code.gitea.io/gitea/modules/convert"
 	// responses:
 	//   "200":
 	//     "$ref": "#/responses/HookList"
+
 	org := ctx.Org.Organization
 	orgHooks, err := models.GetWebhooksByOrgID(org.ID)
 	if err != nil {
-		ctx.Error(500, "GetWebhooksByOrgID", err)
+		ctx.Error(http.StatusInternalServerError, "GetWebhooksByOrgID", err)
 		return
 	}
 	hooks := make([]*api.Hook, len(orgHooks))
 	for i, hook := range orgHooks {
 		hooks[i] = convert.ToHook(org.HomeLink(), hook)
 	}
-	ctx.JSON(200, hooks)
+	ctx.JSON(http.StatusOK, hooks)
 }
 
 // GetHook get an organization's hook by id
 	// responses:
 	//   "200":
 	//     "$ref": "#/responses/Hook"
+
 	org := ctx.Org.Organization
 	hookID := ctx.ParamsInt64(":id")
 	hook, err := utils.GetOrgHook(ctx, org.ID, hookID)
 	if err != nil {
 		return
 	}
-	ctx.JSON(200, convert.ToHook(org.HomeLink(), hook))
+	ctx.JSON(http.StatusOK, convert.ToHook(org.HomeLink(), hook))
 }
 
 // CreateHook create a hook for an organization
 	// responses:
 	//   "204":
 	//     "$ref": "#/responses/empty"
+
 	org := ctx.Org.Organization
 	hookID := ctx.ParamsInt64(":id")
 	if err := models.DeleteWebhookByOrgID(org.ID, hookID); err != nil {
 		if models.IsErrWebhookNotExist(err) {
 			ctx.NotFound()
 		} else {
-			ctx.Error(500, "DeleteWebhookByOrgID", err)
+			ctx.Error(http.StatusInternalServerError, "DeleteWebhookByOrgID", err)
 		}
 		return
 	}
-	ctx.Status(204)
+	ctx.Status(http.StatusNoContent)
 }

routers/api/v1/org/member.go

 
 import (
 	"fmt"
+	"net/http"
 
 	"code.gitea.io/gitea/models"
 	"code.gitea.io/gitea/modules/context"
 		PublicOnly: publicOnly,
 	})
 	if err != nil {
-		ctx.Error(500, "GetUsersByIDs", err)
+		ctx.Error(http.StatusInternalServerError, "GetUsersByIDs", err)
 		return
 	}
 
 	for i, member := range members {
 		apiMembers[i] = convert.ToUser(member, ctx.IsSigned, ctx.User != nil && ctx.User.IsAdmin)
 	}
-	ctx.JSON(200, apiMembers)
+	ctx.JSON(http.StatusOK, apiMembers)
 }
 
 // ListMembers list an organization's members
 	// responses:
 	//   "200":
 	//     "$ref": "#/responses/UserList"
+
 	publicOnly := true
 	if ctx.User != nil {
 		isMember, err := ctx.Org.Organization.IsOrgMember(ctx.User.ID)
 		if err != nil {
-			ctx.Error(500, "IsOrgMember", err)
+			ctx.Error(http.StatusInternalServerError, "IsOrgMember", err)
 			return
 		}
 		publicOnly = !isMember
 	// responses:
 	//   "200":
 	//     "$ref": "#/responses/UserList"
+
 	listMembers(ctx, true)
 }
 
 	// responses:
 	//   "204":
 	//     description: user is a member
+	//   "302":
+	//     description: redirection to /orgs/{org}/public_members/{username}
 	//   "404":
 	//     description: user is not a member
+
 	userToCheck := user.GetUserByParams(ctx)
 	if ctx.Written() {
 		return
 	if ctx.User != nil {
 		userIsMember, err := ctx.Org.Organization.IsOrgMember(ctx.User.ID)
 		if err != nil {
-			ctx.Error(500, "IsOrgMember", err)
+			ctx.Error(http.StatusInternalServerError, "IsOrgMember", err)
 			return
 		} else if userIsMember {
 			userToCheckIsMember, err := ctx.Org.Organization.IsOrgMember(userToCheck.ID)
 			if err != nil {
-				ctx.Error(500, "IsOrgMember", err)
+				ctx.Error(http.StatusInternalServerError, "IsOrgMember", err)
 			} else if userToCheckIsMember {
-				ctx.Status(204)
+				ctx.Status(http.StatusNoContent)
 			} else {
 				ctx.NotFound()
 			}
 	//     description: user is a public member
 	//   "404":
 	//     description: user is not a public member
+
 	userToCheck := user.GetUserByParams(ctx)
 	if ctx.Written() {
 		return
 	}
 	if userToCheck.IsPublicMember(ctx.Org.Organization.ID) {
-		ctx.Status(204)
+		ctx.Status(http.StatusNoContent)
 	} else {
 		ctx.NotFound()
 	}
 	// responses:
 	//   "204":
 	//     description: membership publicized
+	//   "403":
+	//     "$ref": "#/responses/forbidden"
+
 	userToPublicize := user.GetUserByParams(ctx)
 	if ctx.Written() {
 		return
 	}
 	if userToPublicize.ID != ctx.User.ID {
-		ctx.Error(403, "", "Cannot publicize another member")
+		ctx.Error(http.StatusForbidden, "", "Cannot publicize another member")
 		return
 	}
 	err := models.ChangeOrgUserStatus(ctx.Org.Organization.ID, userToPublicize.ID, true)
 	if err != nil {
-		ctx.Error(500, "ChangeOrgUserStatus", err)
+		ctx.Error(http.StatusInternalServerError, "ChangeOrgUserStatus", err)
 		return
 	}
-	ctx.Status(204)
+	ctx.Status(http.StatusNoContent)
 }
 
 // ConcealMember make a member's membership not public
 	// responses:
 	//   "204":
 	//     "$ref": "#/responses/empty"
+	//   "403":
+	//     "$ref": "#/responses/forbidden"
+
 	userToConceal := user.GetUserByParams(ctx)
 	if ctx.Written() {
 		return
 	}
 	if userToConceal.ID != ctx.User.ID {
-		ctx.Error(403, "", "Cannot conceal another member")
+		ctx.Error(http.StatusForbidden, "", "Cannot conceal another member")
 		return
 	}
 	err := models.ChangeOrgUserStatus(ctx.Org.Organization.ID, userToConceal.ID, false)
 	if err != nil {
-		ctx.Error(500, "ChangeOrgUserStatus", err)
+		ctx.Error(http.StatusInternalServerError, "ChangeOrgUserStatus", err)
 		return
 	}
-	ctx.Status(204)
+	ctx.Status(http.StatusNoContent)
 }
 
 // DeleteMember remove a member from an organization
 	// responses:
 	//   "204":
 	//     description: member removed
+
 	member := user.GetUserByParams(ctx)
 	if ctx.Written() {
 		return
 	}
 	if err := ctx.Org.Organization.RemoveMember(member.ID); err != nil {
-		ctx.Error(500, "RemoveMember", err)
+		ctx.Error(http.StatusInternalServerError, "RemoveMember", err)
 	}
-	ctx.Status(204)
+	ctx.Status(http.StatusNoContent)
 }

routers/api/v1/org/org.go

 package org
 
 import (
+	"net/http"
+
 	"code.gitea.io/gitea/models"
 	"code.gitea.io/gitea/modules/context"
 	"code.gitea.io/gitea/modules/convert"
 
 func listUserOrgs(ctx *context.APIContext, u *models.User, all bool) {
 	if err := u.GetOrganizations(all); err != nil {
-		ctx.Error(500, "GetOrganizations", err)
+		ctx.Error(http.StatusInternalServerError, "GetOrganizations", err)
 		return
 	}
 
 	for i := range u.Orgs {
 		apiOrgs[i] = convert.ToOrganization(u.Orgs[i])
 	}
-	ctx.JSON(200, &apiOrgs)
+	ctx.JSON(http.StatusOK, &apiOrgs)
 }
 
 // ListMyOrgs list all my orgs
 	// responses:
 	//   "200":
 	//     "$ref": "#/responses/OrganizationList"
+
 	listUserOrgs(ctx, ctx.User, true)
 }
 
 	// responses:
 	//   "200":
 	//     "$ref": "#/responses/OrganizationList"
+
 	u := user.GetUserByParams(ctx)
 	if ctx.Written() {
 		return
 	//     "$ref": "#/responses/validationError"
 
 	if !ctx.User.CanCreateOrganization() {
-		ctx.Error(403, "Create organization not allowed", nil)
+		ctx.Error(http.StatusForbidden, "Create organization not allowed", nil)
 		return
 	}
 
 		if models.IsErrUserAlreadyExist(err) ||
 			models.IsErrNameReserved(err) ||
 			models.IsErrNamePatternNotAllowed(err) {
-			ctx.Error(422, "", err)
+			ctx.Error(http.StatusUnprocessableEntity, "", err)
 		} else {
-			ctx.Error(500, "CreateOrganization", err)
+			ctx.Error(http.StatusInternalServerError, "CreateOrganization", err)
 		}
 		return
 	}
 
-	ctx.JSON(201, convert.ToOrganization(org))
+	ctx.JSON(http.StatusCreated, convert.ToOrganization(org))
 }
 
 // Get get an organization
 	// responses:
 	//   "200":
 	//     "$ref": "#/responses/Organization"
+
 	if !models.HasOrgVisible(ctx.Org.Organization, ctx.User) {
 		ctx.NotFound("HasOrgVisible", nil)
 		return
 	}
-	ctx.JSON(200, convert.ToOrganization(ctx.Org.Organization))
+	ctx.JSON(http.StatusOK, convert.ToOrganization(ctx.Org.Organization))
 }
 
 // Edit change an organization's information
 	// responses:
 	//   "200":
 	//     "$ref": "#/responses/Organization"
+
 	org := ctx.Org.Organization
 	org.FullName = form.FullName
 	org.Description = form.Description
 		org.Visibility = api.VisibilityModes[form.Visibility]
 	}
 	if err := models.UpdateUserCols(org, "full_name", "description", "website", "location", "visibility"); err != nil {
-		ctx.Error(500, "EditOrganization", err)
+		ctx.Error(http.StatusInternalServerError, "EditOrganization", err)
 		return
 	}
 
-	ctx.JSON(200, convert.ToOrganization(org))
+	ctx.JSON(http.StatusOK, convert.ToOrganization(org))
 }
 
 //Delete an organization
 	// responses:
 	//   "204":
 	//     "$ref": "#/responses/empty"
+
 	if err := models.DeleteOrganization(ctx.Org.Organization); err != nil {
-		ctx.Error(500, "DeleteOrganization", err)
+		ctx.Error(http.StatusInternalServerError, "DeleteOrganization", err)
 		return
 	}
-	ctx.Status(204)
+	ctx.Status(http.StatusNoContent)
 }

routers/api/v1/org/team.go

 package org
 
 import (
+	"net/http"
 	"strings"
 
 	"code.gitea.io/gitea/models"
 	// responses:
 	//   "200":
 	//     "$ref": "#/responses/TeamList"
+
 	org := ctx.Org.Organization
 	if err := org.GetTeams(); err != nil {
-		ctx.Error(500, "GetTeams", err)
+		ctx.Error(http.StatusInternalServerError, "GetTeams", err)
 		return
 	}
 
 	apiTeams := make([]*api.Team, len(org.Teams))
 	for i := range org.Teams {
 		if err := org.Teams[i].GetUnits(); err != nil {
-			ctx.Error(500, "GetUnits", err)
+			ctx.Error(http.StatusInternalServerError, "GetUnits", err)
 			return
 		}
 
 		apiTeams[i] = convert.ToTeam(org.Teams[i])
 	}
-	ctx.JSON(200, apiTeams)
+	ctx.JSON(http.StatusOK, apiTeams)
 }
 
 // ListUserTeams list all the teams a user belongs to
 	// responses:
 	//   "200":
 	//     "$ref": "#/responses/TeamList"
+
 	teams, err := models.GetUserTeams(ctx.User.ID)
 	if err != nil {
-		ctx.Error(500, "GetUserTeams", err)
+		ctx.Error(http.StatusInternalServerError, "GetUserTeams", err)
 		return
 	}
 
 		if !ok {
 			org, err := models.GetUserByID(teams[i].OrgID)
 			if err != nil {
-				ctx.Error(500, "GetUserByID", err)
+				ctx.Error(http.StatusInternalServerError, "GetUserByID", err)
 				return
 			}
 			apiOrg = convert.ToOrganization(org)
 		apiTeams[i] = convert.ToTeam(teams[i])
 		apiTeams[i].Organization = apiOrg
 	}
-	ctx.JSON(200, apiTeams)
+	ctx.JSON(http.StatusOK, apiTeams)
 }
 
 // GetTeam api for get a team
 	// responses:
 	//   "200":
 	//     "$ref": "#/responses/Team"
-	ctx.JSON(200, convert.ToTeam(ctx.Org.Team))
+
+	ctx.JSON(http.StatusOK, convert.ToTeam(ctx.Org.Team))
 }
 
 // CreateTeam api for create a team
 	// responses:
 	//   "201":
 	//     "$ref": "#/responses/Team"
+	//   "422":
+	//     "$ref": "#/responses/validationError"
+
 	team := &models.Team{
 		OrgID:                   ctx.Org.Organization.ID,
 		Name:                    form.Name,
 
 	if err := models.NewTeam(team); err != nil {
 		if models.IsErrTeamAlreadyExist(err) {
-			ctx.Error(422, "", err)
+			ctx.Error(http.StatusUnprocessableEntity, "", err)
 		} else {
-			ctx.Error(500, "NewTeam", err)
+			ctx.Error(http.StatusInternalServerError, "NewTeam", err)
 		}
 		return
 	}
 
-	ctx.JSON(201, convert.ToTeam(team))
+	ctx.JSON(http.StatusCreated, convert.ToTeam(team))
 }
 
 // EditTeam api for edit a team
 	// responses:
 	//   "200":
 	//     "$ref": "#/responses/Team"
+
 	team := ctx.Org.Team
 	team.Description = form.Description
 	unitTypes := models.FindUnitTypes(form.Units...)
 	}
 
 	if err := models.UpdateTeam(team, isAuthChanged, isIncludeAllChanged); err != nil {
-		ctx.Error(500, "EditTeam", err)
+		ctx.Error(http.StatusInternalServerError, "EditTeam", err)
 		return
 	}
-	ctx.JSON(200, convert.ToTeam(team))
+	ctx.JSON(http.StatusOK, convert.ToTeam(team))
 }
 
 // DeleteTeam api for delete a team
 	// responses:
 	//   "204":
 	//     description: team deleted
+
 	if err := models.DeleteTeam(ctx.Org.Team); err != nil {
-		ctx.Error(500, "DeleteTeam", err)
+		ctx.Error(http.StatusInternalServerError, "DeleteTeam", err)
 		return
 	}
-	ctx.Status(204)
+	ctx.Status(http.StatusNoContent)
 }
 
 // GetTeamMembers api for get a team's members
 	// responses:
 	//   "200":
 	//     "$ref": "#/responses/UserList"
+
 	isMember, err := models.IsOrganizationMember(ctx.Org.Team.OrgID, ctx.User.ID)
 	if err != nil {
-		ctx.Error(500, "IsOrganizationMember", err)
+		ctx.Error(http.StatusInternalServerError, "IsOrganizationMember", err)
 		return
 	} else if !isMember {
 		ctx.NotFound()
 	}
 	team := ctx.Org.Team
 	if err := team.GetMembers(); err != nil {
-		ctx.Error(500, "GetTeamMembers", err)
+		ctx.Error(http.StatusInternalServerError, "GetTeamMembers", err)
 		return
 	}
 	members := make([]*api.User, len(team.Members))
 	for i, member := range team.Members {
 		members[i] = convert.ToUser(member, ctx.IsSigned, ctx.User.IsAdmin)
 	}
-	ctx.JSON(200, members)
+	ctx.JSON(http.StatusOK, members)
 }
 
 // GetTeamMember api for get a particular member of team
 	// responses:
 	//   "200":
 	//     "$ref": "#/responses/User"
+	//   "404":
+	//     "$ref": "#/responses/notFound"
+
 	u := user.GetUserByParams(ctx)
 	if ctx.Written() {
 		return
 	teamID := ctx.ParamsInt64("teamid")
 	isTeamMember, err := models.IsUserInTeams(u.ID, []int64{teamID})
 	if err != nil {
-		ctx.Error(500, "IsUserInTeams", err)
+		ctx.Error(http.StatusInternalServerError, "IsUserInTeams", err)
 		return
 	} else if !isTeamMember {
 		ctx.NotFound()
 		return
 	}
-	ctx.JSON(200, convert.ToUser(u, ctx.IsSigned, ctx.User.IsAdmin))
+	ctx.JSON(http.StatusOK, convert.ToUser(u, ctx.IsSigned, ctx.User.IsAdmin))
 }
 
 // AddTeamMember api for add a member to a team
 	// responses:
 	//   "204":
 	//     "$ref": "#/responses/empty"
+	//   "404":
+	//     "$ref": "#/responses/notFound"
+
 	u := user.GetUserByParams(ctx)
 	if ctx.Written() {
 		return
 	}
 	if err := ctx.Org.Team.AddMember(u.ID); err != nil {
-		ctx.Error(500, "AddMember", err)
+		ctx.Error(http.StatusInternalServerError, "AddMember", err)
 		return
 	}
-	ctx.Status(204)
+	ctx.Status(http.StatusNoContent)
 }
 
 // RemoveTeamMember api for remove one member from a team
 	// responses:
 	//   "204":
 	//     "$ref": "#/responses/empty"
+	//   "404":
+	//     "$ref": "#/responses/notFound"
+
 	u := user.GetUserByParams(ctx)
 	if ctx.Written() {
 		return
 	}
 
 	if err := ctx.Org.Team.RemoveMember(u.ID); err != nil {
-		ctx.Error(500, "RemoveMember", err)
+		ctx.Error(http.StatusInternalServerError, "RemoveMember", err)
 		return
 	}
-	ctx.Status(204)
+	ctx.Status(http.StatusNoContent)
 }
 
 // GetTeamRepos api for get a team's repos
 	// responses:
 	//   "200":
 	//     "$ref": "#/responses/RepositoryList"
+
 	team := ctx.Org.Team
 	if err := team.GetRepositories(); err != nil {
-		ctx.Error(500, "GetTeamRepos", err)
+		ctx.Error(http.StatusInternalServerError, "GetTeamRepos", err)
 	}
 	repos := make([]*api.Repository, len(team.Repos))
 	for i, repo := range team.Repos {
 		access, err := models.AccessLevel(ctx.User, repo)
 		if err != nil {
-			ctx.Error(500, "GetTeamRepos", err)
+			ctx.Error(http.StatusInternalServerError, "GetTeamRepos", err)
 			return
 		}
 		repos[i] = repo.APIFormat(access)
 	}
-	ctx.JSON(200, repos)
+	ctx.JSON(http.StatusOK, repos)
 }
 
 // getRepositoryByParams get repository by a team's organization ID and repo name
 		if models.IsErrRepoNotExist(err) {
 			ctx.NotFound()
 		} else {
-			ctx.Error(500, "GetRepositoryByName", err)
+			ctx.Error(http.StatusInternalServerError, "GetRepositoryByName", err)
 		}
 		return nil
 	}
 	// responses:
 	//   "204":
 	//     "$ref": "#/responses/empty"
+	//   "403":
+	//     "$ref": "#/responses/forbidden"
+
 	repo := getRepositoryByParams(ctx)
 	if ctx.Written() {
 		return
 	}
 	if access, err := models.AccessLevel(ctx.User, repo); err != nil {
-		ctx.Error(500, "AccessLevel", err)
+		ctx.Error(http.StatusInternalServerError, "AccessLevel", err)
 		return
 	} else if access < models.AccessModeAdmin {
-		ctx.Error(403, "", "Must have admin-level access to the repository")
+		ctx.Error(http.StatusForbidden, "", "Must have admin-level access to the repository")
 		return
 	}
 	if err := ctx.Org.Team.AddRepository(repo); err != nil {
-		ctx.Error(500, "AddRepository", err)
+		ctx.Error(http.StatusInternalServerError, "AddRepository", err)
 		return
 	}
-	ctx.Status(204)
+	ctx.Status(http.StatusNoContent)
 }
 
 // RemoveTeamRepository api for removing a repository from a team
 	// responses:
 	//   "204":
 	//     "$ref": "#/responses/empty"
+	//   "403":
+	//     "$ref": "#/responses/forbidden"
+
 	repo := getRepositoryByParams(ctx)
 	if ctx.Written() {
 		return
 	}
 	if access, err := models.AccessLevel(ctx.User, repo); err != nil {
-		ctx.Error(500, "AccessLevel", err)
+		ctx.Error(http.StatusInternalServerError, "AccessLevel", err)
 		return
 	} else if access < models.AccessModeAdmin {
-		ctx.Error(403, "", "Must have admin-level access to the repository")
+		ctx.Error(http.StatusForbidden, "", "Must have admin-level access to the repository")
 		return
 	}
 	if err := ctx.Org.Team.RemoveRepository(repo.ID); err != nil {
-		ctx.Error(500, "RemoveRepository", err)
+		ctx.Error(http.StatusInternalServerError, "RemoveRepository", err)
 		return
 	}
-	ctx.Status(204)
+	ctx.Status(http.StatusNoContent)
 }
 
 // SearchTeam api for searching teams
 	//           type: array
 	//           items:
 	//             "$ref": "#/definitions/Team"
+
 	opts := &models.SearchTeamOptions{
 		UserID:      ctx.User.ID,
 		Keyword:     strings.TrimSpace(ctx.Query("q")),
 	teams, _, err := models.SearchTeam(opts)
 	if err != nil {
 		log.Error("SearchTeam failed: %v", err)
-		ctx.JSON(500, map[string]interface{}{
+		ctx.JSON(http.StatusInternalServerError, map[string]interface{}{
 			"ok":    false,
 			"error": "SearchTeam internal failure",
 		})
 	for i := range teams {
 		if err := teams[i].GetUnits(); err != nil {
 			log.Error("Team GetUnits failed: %v", err)
-			ctx.JSON(500, map[string]interface{}{
+			ctx.JSON(http.StatusInternalServerError, map[string]interface{}{
 				"ok":    false,
 				"error": "SearchTeam failed to get units",
 			})
 		apiTeams[i] = convert.ToTeam(teams[i])
 	}
 
-	ctx.JSON(200, map[string]interface{}{
+	ctx.JSON(http.StatusOK, map[string]interface{}{
 		"ok":   true,
 		"data": apiTeams,
 	})

routers/api/v1/repo/blob.go

 	// responses:
 	//   "200":
 	//     "$ref": "#/responses/GitBlobResponse"
+	//   "400":
+	//     "$ref": "#/responses/error"
 
 	sha := ctx.Params("sha")
 	if len(sha) == 0 {

routers/api/v1/repo/branch.go

 package repo
 
 import (
+	"net/http"
+
 	"code.gitea.io/gitea/modules/context"
 	"code.gitea.io/gitea/modules/convert"
 	"code.gitea.io/gitea/modules/git"
 	// responses:
 	//   "200":
 	//     "$ref": "#/responses/Branch"
+
 	if ctx.Repo.TreePath != "" {
 		// if TreePath != "", then URL contained extra slashes
 		// (i.e. "master/subbranch" instead of "master"), so branch does
 		if git.IsErrBranchNotExist(err) {
 			ctx.NotFound(err)
 		} else {
-			ctx.Error(500, "GetBranch", err)
+			ctx.Error(http.StatusInternalServerError, "GetBranch", err)
 		}
 		return
 	}
 
 	c, err := branch.GetCommit()
 	if err != nil {
-		ctx.Error(500, "GetCommit", err)
+		ctx.Error(http.StatusInternalServerError, "GetCommit", err)
 		return
 	}
 
 	branchProtection, err := ctx.Repo.Repository.GetBranchProtection(ctx.Repo.BranchName)
 	if err != nil {
-		ctx.Error(500, "GetBranchProtection", err)
+		ctx.Error(http.StatusInternalServerError, "GetBranchProtection", err)
 		return
 	}
 
-	ctx.JSON(200, convert.ToBranch(ctx.Repo.Repository, branch, c, branchProtection, ctx.User))
+	ctx.JSON(http.StatusOK, convert.ToBranch(ctx.Repo.Repository, branch, c, branchProtection, ctx.User))
 }
 
 // ListBranches list all the branches of a repository
 	// responses:
 	//   "200":
 	//     "$ref": "#/responses/BranchList"
+
 	branches, err := ctx.Repo.Repository.GetBranches()
 	if err != nil {
-		ctx.Error(500, "GetBranches", err)
+		ctx.Error(http.StatusInternalServerError, "GetBranches", err)
 		return
 	}
 
 	for i := range branches {
 		c, err := branches[i].GetCommit()
 		if err != nil {
-			ctx.Error(500, "GetCommit", err)
+			ctx.Error(http.StatusInternalServerError, "GetCommit", err)
 			return
 		}
 		branchProtection, err := ctx.Repo.Repository.GetBranchProtection(branches[i].Name)
 		if err != nil {
-			ctx.Error(500, "GetBranchProtection", err)
+			ctx.Error(http.StatusInternalServerError, "GetBranchProtection", err)
 			return
 		}
 		apiBranches[i] = convert.ToBranch(ctx.Repo.Repository, branches[i], c, branchProtection, ctx.User)
 	}
 
-	ctx.JSON(200, &apiBranches)
+	ctx.JSON(http.StatusOK, &apiBranches)
 }

routers/api/v1/repo/collaborators.go

 
 import (
 	"errors"
+	"net/http"
 
 	"code.gitea.io/gitea/models"
 	"code.gitea.io/gitea/modules/context"
 	// responses:
 	//   "200":
 	//     "$ref": "#/responses/UserList"
+
 	collaborators, err := ctx.Repo.Repository.GetCollaborators()
 	if err != nil {
-		ctx.Error(500, "ListCollaborators", err)
+		ctx.Error(http.StatusInternalServerError, "ListCollaborators", err)
 		return
 	}
 	users := make([]*api.User, len(collaborators))
 	for i, collaborator := range collaborators {
 		users[i] = convert.ToUser(collaborator.User, ctx.IsSigned, ctx.User != nil && ctx.User.IsAdmin)
 	}
-	ctx.JSON(200, users)
+	ctx.JSON(http.StatusOK, users)
 }
 
 // IsCollaborator check if a user is a collaborator of a repository
 	//   "204":
 	//     "$ref": "#/responses/empty"
 	//   "404":
-	//     "$ref": "#/responses/empty"
+	//     "$ref": "#/responses/notFound"
+	//   "422":
+	//     "$ref": "#/responses/validationError"
+
 	user, err := models.GetUserByName(ctx.Params(":collaborator"))
 	if err != nil {
 		if models.IsErrUserNotExist(err) {
-			ctx.Error(422, "", err)
+			ctx.Error(http.StatusUnprocessableEntity, "", err)
 		} else {
-			ctx.Error(500, "GetUserByName", err)
+			ctx.Error(http.StatusInternalServerError, "GetUserByName", err)
 		}
 		return
 	}
 	isColab, err := ctx.Repo.Repository.IsCollaborator(user.ID)
 	if err != nil {
-		ctx.Error(500, "IsCollaborator", err)
+		ctx.Error(http.StatusInternalServerError, "IsCollaborator", err)
 		return
 	}
 	if isColab {
-		ctx.Status(204)
+		ctx.Status(http.StatusNoContent)
 	} else {
 		ctx.NotFound()
 	}
 	// responses:
 	//   "204":
 	//     "$ref": "#/responses/empty"
+	//   "422":
+	//     "$ref": "#/responses/validationError"
+
 	collaborator, err := models.GetUserByName(ctx.Params(":collaborator"))
 	if err != nil {
 		if models.IsErrUserNotExist(err) {
-			ctx.Error(422, "", err)
+			ctx.Error(http.StatusUnprocessableEntity, "", err)
 		} else {
-			ctx.Error(500, "GetUserByName", err)
+			ctx.Error(http.StatusInternalServerError, "GetUserByName", err)
 		}
 		return
 	}
 
 	if !collaborator.IsActive {
-		ctx.Error(500, "InactiveCollaborator", errors.New("collaborator's account is inactive"))
+		ctx.Error(http.StatusInternalServerError, "InactiveCollaborator", errors.New("collaborator's account is inactive"))
 		return
 	}
 
 	if err := ctx.Repo.Repository.AddCollaborator(collaborator); err != nil {
-		ctx.Error(500, "AddCollaborator", err)
+		ctx.Error(http.StatusInternalServerError, "AddCollaborator", err)
 		return
 	}
 
 	if form.Permission != nil {
 		if err := ctx.Repo.Repository.ChangeCollaborationAccessMode(collaborator.ID, models.ParseAccessMode(*form.Permission)); err != nil {
-			ctx.Error(500, "ChangeCollaborationAccessMode", err)
+			ctx.Error(http.StatusInternalServerError, "ChangeCollaborationAccessMode", err)
 			return
 		}
 	}
 
-	ctx.Status(204)
+	ctx.Status(http.StatusNoContent)
 }
 
 // DeleteCollaborator delete a collaborator from a repository
 	// responses:
 	//   "204":
 	//     "$ref": "#/responses/empty"
+	//   "422":
+	//     "$ref": "#/responses/validationError"
+
 	collaborator, err := models.GetUserByName(ctx.Params(":collaborator"))
 	if err != nil {
 		if models.IsErrUserNotExist(err) {
-			ctx.Error(422, "", err)
+			ctx.Error(http.StatusUnprocessableEntity, "", err)
 		} else {
-			ctx.Error(500, "GetUserByName", err)
+			ctx.Error(http.StatusInternalServerError, "GetUserByName", err)
 		}
 		return
 	}
 
 	if err := ctx.Repo.Repository.DeleteCollaboration(collaborator.ID); err != nil {
-		ctx.Error(500, "DeleteCollaboration", err)
+		ctx.Error(http.StatusInternalServerError, "DeleteCollaboration", err)
 		return
 	}
-	ctx.Status(204)
+	ctx.Status(http.StatusNoContent)
 }

routers/api/v1/repo/commits.go

 
 import (
 	"math"
+	"net/http"
 	"strconv"
 	"time"
 
 		return
 	}
 
-	ctx.JSON(200, json)
+	ctx.JSON(http.StatusOK, json)
 }
 
 // GetAllCommits get all commits via
 	//     "$ref": "#/responses/EmptyRepository"
 
 	if ctx.Repo.Repository.IsEmpty {
-		ctx.JSON(409, api.APIError{
+		ctx.JSON(http.StatusConflict, api.APIError{
 			Message: "Git Repository is empty.",
 			URL:     setting.API.SwaggerURL,
 		})
 	ctx.Header().Set("X-PageCount", strconv.Itoa(pageCount))
 	ctx.Header().Set("X-HasMore", strconv.FormatBool(page < pageCount))
 
-	ctx.JSON(200, &apiCommits)
+	ctx.JSON(http.StatusOK, &apiCommits)
 }
 
 func toCommit(ctx *context.APIContext, repo *models.Repository, commit *git.Commit, userCache map[string]*models.User) (*api.Commit, error) {

routers/api/v1/repo/file.go

 	// responses:
 	//   200:
 	//     description: success
+	//   "404":
+	//     "$ref": "#/responses/notFound"
+
 	if ctx.Repo.Repository.IsEmpty {
 		ctx.NotFound()
 		return
 	// responses:
 	//   200:
 	//     description: success
+	//   "404":
+	//     "$ref": "#/responses/notFound"
+
 	repoPath := models.RepoPath(ctx.Params(":username"), ctx.Params(":reponame"))
 	gitRepo, err := git.OpenRepository(repoPath)
 	if err != nil {
 	// responses:
 	//   200:
 	//     description: success
+	//   "404":
+	//     "$ref": "#/responses/notFound"
+
 	ec, err := ctx.Repo.GetEditorconfig()
 	if err != nil {
 		if git.IsErrNotExist(err) {
 	// responses:
 	//   "200":
 	//     "$ref": "#/responses/FileDeleteResponse"
+
 	if !CanWriteFiles(ctx.Repo) {
 		ctx.Error(http.StatusInternalServerError, "DeleteFile", models.ErrUserDoesNotHaveAccessToRepo{
 			UserID:   ctx.User.ID,

routers/api/v1/repo/fork.go

 package repo
 
 import (
+	"fmt"
+	"net/http"
+
 	"code.gitea.io/gitea/models"
 	"code.gitea.io/gitea/modules/context"
 	api "code.gitea.io/gitea/modules/structs"
 	// responses:
 	//   "200":
 	//     "$ref": "#/responses/RepositoryList"
+
 	forks, err := ctx.Repo.Repository.GetForks()
 	if err != nil {
-		ctx.Error(500, "GetForks", err)
+		ctx.Error(http.StatusInternalServerError, "GetForks", err)
 		return
 	}
 	apiForks := make([]*api.Repository, len(forks))
 	for i, fork := range forks {
 		access, err := models.AccessLevel(ctx.User, fork)
 		if err != nil {
-			ctx.Error(500, "AccessLevel", err)
+			ctx.Error(http.StatusInternalServerError, "AccessLevel", err)
 			return
 		}
 		apiForks[i] = fork.APIFormat(access)
 	}
-	ctx.JSON(200, apiForks)
+	ctx.JSON(http.StatusOK, apiForks)
 }
 
 // CreateFork create a fork of a repo
 	// responses:
 	//   "202":
 	//     "$ref": "#/responses/Repository"
+	//   "403":
+	//     "$ref": "#/responses/forbidden"
+	//   "422":
+	//     "$ref": "#/responses/validationError"
+
 	repo := ctx.Repo.Repository
 	var forker *models.User // user/org that will own the fork
 	if form.Organization == nil {
 		org, err := models.GetOrgByName(*form.Organization)
 		if err != nil {
 			if models.IsErrOrgNotExist(err) {
-				ctx.Error(422, "", err)
+				ctx.Error(http.StatusUnprocessableEntity, "", err)
 			} else {
-				ctx.Error(500, "GetOrgByName", err)
+				ctx.Error(http.StatusInternalServerError, "GetOrgByName", err)
 			}
 			return
 		}
 			ctx.ServerError("IsOrgMember", err)
 			return
 		} else if !isMember {
-			ctx.Status(403)
+			ctx.Error(http.StatusForbidden, "isMemberNot", fmt.Sprintf("User is no Member of Organisation '%s'", org.Name))
 			return
 		}
 		forker = org
 
 	fork, err := repo_service.ForkRepository(ctx.User, forker, repo, repo.Name, repo.Description)
 	if err != nil {
-		ctx.Error(500, "ForkRepository", err)
+		ctx.Error(http.StatusInternalServerError, "ForkRepository", err)
 		return
 	}
 
-	ctx.JSON(202, fork.APIFormat(models.AccessModeOwner))
+	//TODO change back to 201
+	ctx.JSON(http.StatusAccepted, fork.APIFormat(models.AccessModeOwner))
 }

routers/api/v1/repo/git_hook.go

 package repo
 
 import (
+	"net/http"
+
 	"code.gitea.io/gitea/modules/context"
 	"code.gitea.io/gitea/modules/convert"
 	"code.gitea.io/gitea/modules/git"
 	// responses:
 	//   "200":
 	//     "$ref": "#/responses/GitHookList"
+
 	hooks, err := ctx.Repo.GitRepo.Hooks()
 	if err != nil {
-		ctx.Error(500, "Hooks", err)
+		ctx.Error(http.StatusInternalServerError, "Hooks", err)
 		return
 	}
 
 	for i := range hooks {
 		apiHooks[i] = convert.ToGitHook(hooks[i])
 	}
-	ctx.JSON(200, &apiHooks)
+	ctx.JSON(http.StatusOK, &apiHooks)
 }
 
 // GetGitHook get a repo's Git hook by id
 	//     "$ref": "#/responses/GitHook"
 	//   "404":
 	//     "$ref": "#/responses/notFound"
+
 	hookID := ctx.Params(":id")
 	hook, err := ctx.Repo.GitRepo.GetHook(hookID)
 	if err != nil {
 		if err == git.ErrNotValidHook {
 			ctx.NotFound()
 		} else {
-			ctx.Error(500, "GetHook", err)
+			ctx.Error(http.StatusInternalServerError, "GetHook", err)
 		}
 		return
 	}
-	ctx.JSON(200, convert.ToGitHook(hook))
+	ctx.JSON(http.StatusOK, convert.ToGitHook(hook))
 }
 
 // EditGitHook modify a Git hook of a repository
 	//     "$ref": "#/responses/GitHook"
 	//   "404":
 	//     "$ref": "#/responses/notFound"
+
 	hookID := ctx.Params(":id")
 	hook, err := ctx.Repo.GitRepo.GetHook(hookID)
 	if err != nil {
 		if err == git.ErrNotValidHook {
 			ctx.NotFound()
 		} else {
-			ctx.Error(500, "GetHook", err)
+			ctx.Error(http.StatusInternalServerError, "GetHook", err)
 		}
 		return
 	}
 
 	hook.Content = form.Content
 	if err = hook.Update(); err != nil {
-		ctx.Error(500, "hook.Update", err)
+		ctx.Error(http.StatusInternalServerError, "hook.Update", err)
 		return
 	}
 
-	ctx.JSON(200, convert.ToGitHook(hook))
+	ctx.JSON(http.StatusOK, convert.ToGitHook(hook))
 }
 
 // DeleteGitHook delete a Git hook of a repository
 	//     "$ref": "#/responses/empty"
 	//   "404":
 	//     "$ref": "#/responses/notFound"
+
 	hookID := ctx.Params(":id")
 	hook, err := ctx.Repo.GitRepo.GetHook(hookID)
 	if err != nil {
 		if err == git.ErrNotValidHook {
 			ctx.NotFound()
 		} else {
-			ctx.Error(500, "GetHook", err)
+			ctx.Error(http.StatusInternalServerError, "GetHook", err)
 		}
 		return
 	}
 
 	hook.Content = ""
 	if err = hook.Update(); err != nil {
-		ctx.Error(500, "hook.Update", err)
+		ctx.Error(http.StatusInternalServerError, "hook.Update", err)
 		return
 	}
 
-	ctx.Status(204)
+	ctx.Status(http.StatusNoContent)
 }

routers/api/v1/repo/git_ref.go

 package repo
 
 import (
+	"net/http"
+
 	"code.gitea.io/gitea/modules/context"
 	"code.gitea.io/gitea/modules/git"
 	api "code.gitea.io/gitea/modules/structs"
 func getGitRefsInternal(ctx *context.APIContext, filter string) {
 	refs, lastMethodName, err := getGitRefs(ctx, filter)
 	if err != nil {
-		ctx.Error(500, lastMethodName, err)
+		ctx.Error(http.StatusInternalServerError, lastMethodName, err)
 		return
 	}
 
 	}
 	// If single reference is found and it matches filter exactly return it as object
 	if len(apiRefs) == 1 && apiRefs[0].Ref == filter {
-		ctx.JSON(200, &apiRefs[0])
+		ctx.JSON(http.StatusOK, &apiRefs[0])
 		return
 	}
-	ctx.JSON(200, &apiRefs)
+	ctx.JSON(http.StatusOK, &apiRefs)
 }

routers/api/v1/repo/hook.go

 package repo
 
 import (
+	"net/http"
+
 	"code.gitea.io/gitea/models"
 	"code.gitea.io/gitea/modules/context"
 	"code.gitea.io/gitea/modules/convert"
 	// responses:
 	//   "200":
 	//     "$ref": "#/responses/HookList"
+
 	hooks, err := models.GetWebhooksByRepoID(ctx.Repo.Repository.ID)
 	if err != nil {
-		ctx.Error(500, "GetWebhooksByRepoID", err)
+		ctx.Error(http.StatusInternalServerError, "GetWebhooksByRepoID", err)
 		return
 	}
 
 	for i := range hooks {
 		apiHooks[i] = convert.ToHook(ctx.Repo.RepoLink, hooks[i])
 	}
-	ctx.JSON(200, &apiHooks)
+	ctx.JSON(http.StatusOK, &apiHooks)
 }
 
 // GetHook get a repo's hook by id
 	// responses:
 	//   "200":
 	//     "$ref": "#/responses/Hook"
+	//   "404":
+	//     "$ref": "#/responses/notFound"
+
 	repo := ctx.Repo
 	hookID := ctx.ParamsInt64(":id")
 	hook, err := utils.GetRepoHook(ctx, repo.Repository.ID, hookID)
 	if err != nil {
 		return
 	}
-	ctx.JSON(200, convert.ToHook(repo.RepoLink, hook))
+	ctx.JSON(http.StatusOK, convert.ToHook(repo.RepoLink, hook))
 }
 
 // TestHook tests a hook
 	// responses:
 	//   "204":
 	//     "$ref": "#/responses/empty"
+
 	if ctx.Repo.Commit == nil {
 		// if repo does not have any commits, then don't send a webhook
-		ctx.Status(204)
+		ctx.Status(http.StatusNoContent)
 		return
 	}
 
 		Pusher: convert.ToUser(ctx.User, ctx.IsSigned, false),
 		Sender: convert.ToUser(ctx.User, ctx.IsSigned, false),
 	}); err != nil {
-		ctx.Error(500, "PrepareWebhook: ", err)
+		ctx.Error(http.StatusInternalServerError, "PrepareWebhook: ", err)
 		return
 	}
 
-	ctx.Status(204)
+	ctx.Status(http.StatusNoContent)
 }
 
 // CreateHook create a hook for a repository
 		if models.IsErrWebhookNotExist(err) {
 			ctx.NotFound()
 		} else {
-			ctx.Error(500, "DeleteWebhookByRepoID", err)
+			ctx.Error(http.StatusInternalServerError, "DeleteWebhookByRepoID", err)
 		}
 		return
 	}
-	ctx.Status(204)
+	ctx.Status(http.StatusNoContent)
 }

routers/api/v1/repo/issue.go

 	// responses:
 	//   "200":
 	//     "$ref": "#/responses/IssueList"
+
 	var isClosed util.OptionalBool
 	switch ctx.Query("state") {
 	case "closed":
 			OrderBy:     models.SearchOrderByRecentUpdated,
 		})
 		if err != nil {
-			ctx.Error(500, "SearchRepositoryByName", err)
+			ctx.Error(http.StatusInternalServerError, "SearchRepositoryByName", err)
 			return
 		}
 
 	if splitted := strings.Split(labels, ","); labels != "" && len(splitted) > 0 {
 		labelIDs, err = models.GetLabelIDsInReposByNames(repoIDs, splitted)
 		if err != nil {
-			ctx.Error(500, "GetLabelIDsInRepoByNames", err)
+			ctx.Error(http.StatusInternalServerError, "GetLabelIDsInRepoByNames", err)
 			return
 		}
 	}
 	}
 
 	if err != nil {
-		ctx.Error(500, "Issues", err)
+		ctx.Error(http.StatusInternalServerError, "Issues", err)
 		return
 	}
 
 	}
 
 	ctx.SetLinkHeader(issueCount, setting.UI.IssuePagingNum)
-	ctx.JSON(200, &apiIssues)
+	ctx.JSON(http.StatusOK, &apiIssues)
 }
 
 // ListIssues list the issues of a repository
 	// responses:
 	//   "200":
 	//     "$ref": "#/responses/IssueList"
+
 	var isClosed util.OptionalBool
 	switch ctx.Query("state") {
 	case "closed":
 	if splitted := strings.Split(ctx.Query("labels"), ","); len(splitted) > 0 {
 		labelIDs, err = models.GetLabelIDsInRepoByNames(ctx.Repo.Repository.ID, splitted)
 		if err != nil {
-			ctx.Error(500, "GetLabelIDsInRepoByNames", err)
+			ctx.Error(http.StatusInternalServerError, "GetLabelIDsInRepoByNames", err)
 			return
 		}
 	}
 	}
 
 	if err != nil {
-		ctx.Error(500, "Issues", err)
+		ctx.Error(http.StatusInternalServerError, "Issues", err)
 		return
 	}
 
 	}
 
 	ctx.SetLinkHeader(ctx.Repo.Repository.NumIssues, setting.UI.IssuePagingNum)
-	ctx.JSON(200, &apiIssues)
+	ctx.JSON(http.StatusOK, &apiIssues)
 }
 
 // GetIssue get an issue of a repository
 	// responses:
 	//   "200":
 	//     "$ref": "#/responses/Issue"
+	//   "404":
+	//     "$ref": "#/responses/notFound"
+
 	issue, err := models.GetIssueWithAttrsByIndex(ctx.Repo.Repository.ID, ctx.ParamsInt64(":index"))
 	if err != nil {
 		if models.IsErrIssueNotExist(err) {
 			ctx.NotFound()
 		} else {
-			ctx.Error(500, "GetIssueByIndex", err)
+			ctx.Error(http.StatusInternalServerError, "GetIssueByIndex", err)
 		}
 		return
 	}
-	ctx.JSON(200, issue.APIFormat())
+	ctx.JSON(http.StatusOK, issue.APIFormat())
 }
 
 // CreateIssue create an issue of a repository
 	// responses:
 	//   "201":
 	//     "$ref": "#/responses/Issue"
+	//   "403":
+	//     "$ref": "#/responses/forbidden"
+	//   "412":
+	//     "$ref": "#/responses/error"
+	//   "422":
+	//     "$ref": "#/responses/validationError"
 
 	var deadlineUnix timeutil.TimeStamp
 	if form.Deadline != nil && ctx.Repo.CanWrite(models.UnitTypeIssues) {
 		assigneeIDs, err = models.MakeIDsFromAPIAssigneesToAdd(form.Assignee, form.Assignees)
 		if err != nil {
 			if models.IsErrUserNotExist(err) {
-				ctx.Error(422, "", fmt.Sprintf("Assignee does not exist: [name: %s]", err))
+				ctx.Error(http.StatusUnprocessableEntity, "", fmt.Sprintf("Assignee does not exist: [name: %s]", err))
 			} else {
-				ctx.Error(500, "AddAssigneeByName", err)
+				ctx.Error(http.StatusInternalServerError, "AddAssigneeByName", err)
 			}
 			return
 		}
 		for _, aID := range assigneeIDs {
 			assignee, err := models.GetUserByID(aID)
 			if err != nil {
-				ctx.Error(500, "GetUserByID", err)
+				ctx.Error(http.StatusInternalServerError, "GetUserByID", err)
 				return
 			}
 
 			valid, err := models.CanBeAssigned(assignee, ctx.Repo.Repository, false)
 			if err != nil {
-				ctx.Error(500, "canBeAssigned", err)
+				ctx.Error(http.StatusInternalServerError, "canBeAssigned", err)
 				return
 			}
 			if !valid {
-				ctx.Error(422, "canBeAssigned", models.ErrUserDoesNotHaveAccessToRepo{UserID: aID, RepoName: ctx.Repo.Repository.Name})
+				ctx.Error(http.StatusUnprocessableEntity, "canBeAssigned", models.ErrUserDoesNotHaveAccessToRepo{UserID: aID, RepoName: ctx.Repo.Repository.Name})
 				return
 			}
 		}
 
 	if err := issue_service.NewIssue(ctx.Repo.Repository, issue, form.Labels, nil, assigneeIDs); err != nil {
 		if models.IsErrUserDoesNotHaveAccessToRepo(err) {
-			ctx.Error(400, "UserDoesNotHaveAccessToRepo", err)
+			ctx.Error(http.StatusBadRequest, "UserDoesNotHaveAccessToRepo", err)
 			return
 		}
-		ctx.Error(500, "NewIssue", err)
+		ctx.Error(http.StatusInternalServerError, "NewIssue", err)
 		return
 	}
 
 				ctx.Error(http.StatusPreconditionFailed, "DependenciesLeft", "cannot close this issue because it still has open dependencies")
 				return
 			}
-			ctx.Error(500, "ChangeStatus", err)
+			ctx.Error(http.StatusInternalServerError, "ChangeStatus", err)
 			return
 		}
 	}
 	// Refetch from database to assign some automatic values
 	issue, err = models.GetIssueByID(issue.ID)
 	if err != nil {
-		ctx.Error(500, "GetIssueByID", err)
+		ctx.Error(http.StatusInternalServerError, "GetIssueByID", err)
 		return
 	}
-	ctx.JSON(201, issue.APIFormat())
+	ctx.JSON(http.StatusCreated, issue.APIFormat())
 }
 
 // EditIssue modify an issue of a repository
 	// responses:
 	//   "201":
 	//     "$ref": "#/responses/Issue"
+	//   "403":
+	//     "$ref": "#/responses/forbidden"
+	//   "404":
+	//     "$ref": "#/responses/notFound"
+	//   "412":
+	//     "$ref": "#/responses/error"
+
 	issue, err := models.GetIssueByIndex(ctx.Repo.Repository.ID, ctx.ParamsInt64(":index"))
 	if err != nil {
 		if models.IsErrIssueNotExist(err) {
 			ctx.NotFound()
 		} else {
-			ctx.Error(500, "GetIssueByIndex", err)
+			ctx.Error(http.StatusInternalServerError, "GetIssueByIndex", err)
 		}
 		return
 	}
 
 	err = issue.LoadAttributes()
 	if err != nil {
-		ctx.Error(500, "LoadAttributes", err)
+		ctx.Error(http.StatusInternalServerError, "LoadAttributes", err)
 		return
 	}
 
 	if !issue.IsPoster(ctx.User.ID) && !ctx.Repo.CanWrite(models.UnitTypeIssues) {
-		ctx.Status(403)
+		ctx.Status(http.StatusForbidden)
 		return
 	}
 
 		}
 
 		if err := models.UpdateIssueDeadline(issue, deadlineUnix, ctx.User); err != nil {
-			ctx.Error(500, "UpdateIssueDeadline", err)
+			ctx.Error(http.StatusInternalServerError, "UpdateIssueDeadline", err)
 			return
 		}
 		issue.DeadlineUnix = deadlineUnix
 
 		err = issue_service.UpdateAssignees(issue, oneAssignee, form.Assignees, ctx.User)
 		if err != nil {
-			ctx.Error(500, "UpdateAssignees", err)
+			ctx.Error(http.StatusInternalServerError, "UpdateAssignees", err)
 			return
 		}
 	}
 		oldMilestoneID := issue.MilestoneID
 		issue.MilestoneID = *form.Milestone
 		if err = issue_service.ChangeMilestoneAssign(issue, ctx.User, oldMilestoneID); err != nil {
-			ctx.Error(500, "ChangeMilestoneAssign", err)
+			ctx.Error(http.StatusInternalServerError, "ChangeMilestoneAssign", err)
 			return
 		}
 	}
 
 	if err = models.UpdateIssue(issue); err != nil {
-		ctx.Error(500, "UpdateIssue", err)
+		ctx.Error(http.StatusInternalServerError, "UpdateIssue", err)
 		return
 	}
 	if form.State != nil {
 				ctx.Error(http.StatusPreconditionFailed, "DependenciesLeft", "cannot close this issue because it still has open dependencies")
 				return
 			}
-			ctx.Error(500, "ChangeStatus", err)
+			ctx.Error(http.StatusInternalServerError, "ChangeStatus", err)
 			return
 		}
 	}
 	// Refetch from database to assign some automatic values
 	issue, err = models.GetIssueByID(issue.ID)
 	if err != nil {
-		ctx.Error(500, "GetIssueByID", err)
+		ctx.Error(http.StatusInternalServerError, "GetIssueByID", err)
 		return
 	}
-	ctx.JSON(201, issue.APIFormat())
+	ctx.JSON(http.StatusCreated, issue.APIFormat())
 }
 
 // UpdateIssueDeadline updates an issue deadline
 	//   "201":
 	//     "$ref": "#/responses/IssueDeadline"
 	//   "403":
-	//     description: Not repo writer
+	//     "$ref": "#/responses/forbidden"
 	//   "404":
-	//     description: Issue not found
+	//     "$ref": "#/responses/notFound"
 
 	issue, err := models.GetIssueByIndex(ctx.Repo.Repository.ID, ctx.ParamsInt64(":index"))
 	if err != nil {
 		if models.IsErrIssueNotExist(err) {
 			ctx.NotFound()
 		} else {
-			ctx.Error(500, "GetIssueByIndex", err)
+			ctx.Error(http.StatusInternalServerError, "GetIssueByIndex", err)
 		}
 		return
 	}
 
 	if !ctx.Repo.CanWrite(models.UnitTypeIssues) {
-		ctx.Status(403)
+		ctx.Error(http.StatusForbidden, "", "Not repo writer")
 		return
 	}
 
 	}
 
 	if err := models.UpdateIssueDeadline(issue, deadlineUnix, ctx.User); err != nil {
-		ctx.Error(500, "UpdateIssueDeadline", err)
+		ctx.Error(http.StatusInternalServerError, "UpdateIssueDeadline", err)
 		return
 	}
 
-	ctx.JSON(201, api.IssueDeadline{Deadline: &deadline})
+	ctx.JSON(http.StatusCreated, api.IssueDeadline{Deadline: &deadline})
 }

routers/api/v1/repo/issue_comment.go

 
 import (
 	"errors"
+	"net/http"
 	"time"
 
 	"code.gitea.io/gitea/models"
 	// responses:
 	//   "200":
 	//     "$ref": "#/responses/CommentList"
+
 	var since time.Time
 	if len(ctx.Query("since")) > 0 {
 		since, _ = time.Parse(time.RFC3339, ctx.Query("since"))
 	// comments,err:=models.GetCommentsByIssueIDSince(, since)
 	issue, err := models.GetIssueByIndex(ctx.Repo.Repository.ID, ctx.ParamsInt64(":index"))
 	if err != nil {
-		ctx.Error(500, "GetRawIssueByIndex", err)
+		ctx.Error(http.StatusInternalServerError, "GetRawIssueByIndex", err)
 		return
 	}
 	issue.Repo = ctx.Repo.Repository
 		Type:    models.CommentTypeComment,
 	})
 	if err != nil {
-		ctx.Error(500, "FindComments", err)
+		ctx.Error(http.StatusInternalServerError, "FindComments", err)
 		return
 	}
 
 	if err := models.CommentList(comments).LoadPosters(); err != nil {
-		ctx.Error(500, "LoadPosters", err)
+		ctx.Error(http.StatusInternalServerError, "LoadPosters", err)
 		return
 	}
 
 		comment.Issue = issue
 		apiComments[i] = comments[i].APIFormat()
 	}
-	ctx.JSON(200, &apiComments)
+	ctx.JSON(http.StatusOK, &apiComments)
 }
 
 // ListRepoIssueComments returns all issue-comments for a repo
 	// responses:
 	//   "200":
 	//     "$ref": "#/responses/CommentList"
+
 	var since time.Time
 	if len(ctx.Query("since")) > 0 {
 		since, _ = time.Parse(time.RFC3339, ctx.Query("since"))
 		Type:   models.CommentTypeComment,
 	})
 	if err != nil {
-		ctx.Error(500, "FindComments", err)
+		ctx.Error(http.StatusInternalServerError, "FindComments", err)
 		return
 	}
 
 	if err = models.CommentList(comments).LoadPosters(); err != nil {
-		ctx.Error(500, "LoadPosters", err)
+		ctx.Error(http.StatusInternalServerError, "LoadPosters", err)
 		return
 	}
 
 	apiComments := make([]*api.Comment, len(comments))
 	if err := models.CommentList(comments).LoadIssues(); err != nil {
-		ctx.Error(500, "LoadIssues", err)
+		ctx.Error(http.StatusInternalServerError, "LoadIssues", err)
 		return
 	}
 	if err := models.CommentList(comments).LoadPosters(); err != nil {
-		ctx.Error(500, "LoadPosters", err)
+		ctx.Error(http.StatusInternalServerError, "LoadPosters", err)
 		return
 	}
 	if _, err := models.CommentList(comments).Issues().LoadRepositories(); err != nil {
-		ctx.Error(500, "LoadRepositories", err)
+		ctx.Error(http.StatusInternalServerError, "LoadRepositories", err)
 		return
 	}
 	for i := range comments {
 		apiComments[i] = comments[i].APIFormat()
 	}
-	ctx.JSON(200, &apiComments)
+	ctx.JSON(http.StatusOK, &apiComments)
 }
 
 // CreateIssueComment create a comment for an issue
 	// responses:
 	//   "201":
 	//     "$ref": "#/responses/Comment"
+	//   "403":
+	//     "$ref": "#/responses/forbidden"
+
 	issue, err := models.GetIssueByIndex(ctx.Repo.Repository.ID, ctx.ParamsInt64(":index"))
 	if err != nil {
-		ctx.Error(500, "GetIssueByIndex", err)
+		ctx.Error(http.StatusInternalServerError, "GetIssueByIndex", err)
 		return
 	}
 
 	if issue.IsLocked && !ctx.Repo.CanWrite(models.UnitTypeIssues) && !ctx.User.IsAdmin {
-		ctx.Error(403, "CreateIssueComment", errors.New(ctx.Tr("repo.issues.comment_on_locked")))
+		ctx.Error(http.StatusForbidden, "CreateIssueComment", errors.New(ctx.Tr("repo.issues.comment_on_locked")))
 		return
 	}
 
 	comment, err := comment_service.CreateIssueComment(ctx.User, ctx.Repo.Repository, issue, form.Body, nil)
 	if err != nil {
-		ctx.Error(500, "CreateIssueComment", err)
+		ctx.Error(http.StatusInternalServerError, "CreateIssueComment", err)
 		return
 	}
 
-	ctx.JSON(201, comment.APIFormat())
+	ctx.JSON(http.StatusCreated, comment.APIFormat())
 }
 
 // EditIssueComment modify a comment of an issue
 	// responses:
 	//   "200":
 	//     "$ref": "#/responses/Comment"
+	//   "204":
+	//     "$ref": "#/responses/empty"
+	//   "403":
+	//     "$ref": "#/responses/forbidden"
+
 	editIssueComment(ctx, form)
 }
 
 		if models.IsErrCommentNotExist(err) {
 			ctx.NotFound(err)
 		} else {
-			ctx.Error(500, "GetCommentByID", err)
+			ctx.Error(http.StatusInternalServerError, "GetCommentByID", err)
 		}
 		return
 	}
 
 	if !ctx.IsSigned || (ctx.User.ID != comment.PosterID && !ctx.Repo.IsAdmin()) {
-		ctx.Status(403)
+		ctx.Status(http.StatusForbidden)
 		return
 	} else if comment.Type != models.CommentTypeComment {
-		ctx.Status(204)
+		ctx.Status(http.StatusNoContent)
 		return
 	}
 
 	oldContent := comment.Content
 	comment.Content = form.Body
 	if err := comment_service.UpdateComment(comment, ctx.User, oldContent); err != nil {
-		ctx.Error(500, "UpdateComment", err)
+		ctx.Error(http.StatusInternalServerError, "UpdateComment", err)
 		return
 	}
 
-	ctx.JSON(200, comment.APIFormat())
+	ctx.JSON(http.StatusOK, comment.APIFormat())
 }
 
 // DeleteIssueComment delete a comment from an issue
 	// responses:
 	//   "204":
 	//     "$ref": "#/responses/empty"
+	//   "403":
+	//     "$ref": "#/responses/forbidden"
+
 	deleteIssueComment(ctx)
 }
 
 	// responses:
 	//   "204":
 	//     "$ref": "#/responses/empty"
+	//   "403":
+	//     "$ref": "#/responses/forbidden"
+
 	deleteIssueComment(ctx)
 }
 
 		if models.IsErrCommentNotExist(err) {
 			ctx.NotFound(err)
 		} else {
-			ctx.Error(500, "GetCommentByID", err)
+			ctx.Error(http.StatusInternalServerError, "GetCommentByID", err)
 		}
 		return
 	}
 
 	if !ctx.IsSigned || (ctx.User.ID != comment.PosterID && !ctx.Repo.IsAdmin()) {
-		ctx.Status(403)
+		ctx.Status(http.StatusForbidden)
 		return
 	} else if comment.Type != models.CommentTypeComment {
-		ctx.Status(204)
+		ctx.Status(http.StatusNoContent)
 		return
 	}
 
 	if err = comment_service.DeleteComment(comment, ctx.User); err != nil {
-		ctx.Error(500, "DeleteCommentByID", err)
+		ctx.Error(http.StatusInternalServerError, "DeleteCommentByID", err)
 		return
 	}
 
-	ctx.Status(204)
+	ctx.Status(http.StatusNoContent)
 }

routers/api/v1/repo/issue_label.go

 package repo
 
 import (
+	"net/http"
+
 	"code.gitea.io/gitea/models"
 	"code.gitea.io/gitea/modules/context"
 	api "code.gitea.io/gitea/modules/structs"
 	//     "$ref": "#/responses/LabelList"
 	//   "404":
 	//     "$ref": "#/responses/notFound"
+
 	issue, err := models.GetIssueByIndex(ctx.Repo.Repository.ID, ctx.ParamsInt64(":index"))
 	if err != nil {
 		if models.IsErrIssueNotExist(err) {
 			ctx.NotFound()
 		} else {
-			ctx.Error(500, "GetIssueByIndex", err)
+			ctx.Error(http.StatusInternalServerError, "GetIssueByIndex", err)
 		}
 		return
 	}
 
 	if err := issue.LoadAttributes(); err != nil {
-		ctx.Error(500, "LoadAttributes", err)
+		ctx.Error(http.StatusInternalServerError, "LoadAttributes", err)
 		return
 	}
 
 	for i := range issue.Labels {
 		apiLabels[i] = issue.Labels[i].APIFormat()
 	}
-	ctx.JSON(200, &apiLabels)
+	ctx.JSON(http.StatusOK, &apiLabels)
 }
 
 // AddIssueLabels add labels for an issue
 	// responses:
 	//   "200":
 	//     "$ref": "#/responses/LabelList"
+	//   "403":
+	//     "$ref": "#/responses/forbidden"
+
 	issue, err := models.GetIssueByIndex(ctx.Repo.Repository.ID, ctx.ParamsInt64(":index"))
 	if err != nil {
 		if models.IsErrIssueNotExist(err) {
 			ctx.NotFound()
 		} else {
-			ctx.Error(500, "GetIssueByIndex", err)
+			ctx.Error(http.StatusInternalServerError, "GetIssueByIndex", err)
 		}
 		return
 	}
 
 	if !ctx.Repo.CanWriteIssuesOrPulls(issue.IsPull) {
-		ctx.Status(403)
+		ctx.Status(http.StatusForbidden)
 		return
 	}
 
 	labels, err := models.GetLabelsInRepoByIDs(ctx.Repo.Repository.ID, form.Labels)
 	if err != nil {
-		ctx.Error(500, "GetLabelsInRepoByIDs", err)
+		ctx.Error(http.StatusInternalServerError, "GetLabelsInRepoByIDs", err)
 		return
 	}
 
 	if err = issue_service.AddLabels(issue, ctx.User, labels); err != nil {
-		ctx.Error(500, "AddLabels", err)
+		ctx.Error(http.StatusInternalServerError, "AddLabels", err)
 		return
 	}
 
 	labels, err = models.GetLabelsByIssueID(issue.ID)
 	if err != nil {
-		ctx.Error(500, "GetLabelsByIssueID", err)
+		ctx.Error(http.StatusInternalServerError, "GetLabelsByIssueID", err)
 		return
 	}
 
 	for i := range labels {
 		apiLabels[i] = labels[i].APIFormat()
 	}
-	ctx.JSON(200, &apiLabels)
+	ctx.JSON(http.StatusOK, &apiLabels)
 }
 
 // DeleteIssueLabel delete a label for an issue
 	// responses:
 	//   "204":
 	//     "$ref": "#/responses/empty"
+	//   "403":
+	//     "$ref": "#/responses/forbidden"
+	//   "422":
+	//     "$ref": "#/responses/validationError"
+
 	issue, err := models.GetIssueByIndex(ctx.Repo.Repository.ID, ctx.ParamsInt64(":index"))
 	if err != nil {
 		if models.IsErrIssueNotExist(err) {
 			ctx.NotFound()
 		} else {
-			ctx.Error(500, "GetIssueByIndex", err)
+			ctx.Error(http.StatusInternalServerError, "GetIssueByIndex", err)
 		}
 		return
 	}
 
 	if !ctx.Repo.CanWriteIssuesOrPulls(issue.IsPull) {
-		ctx.Status(403)
+		ctx.Status(http.StatusForbidden)
 		return
 	}
 
 	label, err := models.GetLabelInRepoByID(ctx.Repo.Repository.ID, ctx.ParamsInt64(":id"))
 	if err != nil {
 		if models.IsErrLabelNotExist(err) {
-			ctx.Error(422, "", err)
+			ctx.Error(http.StatusUnprocessableEntity, "", err)
 		} else {
-			ctx.Error(500, "GetLabelInRepoByID", err)
+			ctx.Error(http.StatusInternalServerError, "GetLabelInRepoByID", err)
 		}
 		return
 	}
 
 	if err := models.DeleteIssueLabel(issue, label, ctx.User); err != nil {
-		ctx.Error(500, "DeleteIssueLabel", err)
+		ctx.Error(http.StatusInternalServerError, "DeleteIssueLabel", err)
 		return
 	}
 
-	ctx.Status(204)
+	ctx.Status(http.StatusNoContent)
 }
 
 // ReplaceIssueLabels replace labels for an issue
 	// responses:
 	//   "200":
 	//     "$ref": "#/responses/LabelList"
+	//   "403":
+	//     "$ref": "#/responses/forbidden"
+
 	issue, err := models.GetIssueByIndex(ctx.Repo.Repository.ID, ctx.ParamsInt64(":index"))
 	if err != nil {
 		if models.IsErrIssueNotExist(err) {
 			ctx.NotFound()
 		} else {
-			ctx.Error(500, "GetIssueByIndex", err)
+			ctx.Error(http.StatusInternalServerError, "GetIssueByIndex", err)
 		}
 		return
 	}
 
 	if !ctx.Repo.CanWriteIssuesOrPulls(issue.IsPull) {
-		ctx.Status(403)
+		ctx.Status(http.StatusForbidden)
 		return
 	}
 
 	labels, err := models.GetLabelsInRepoByIDs(ctx.Repo.Repository.ID, form.Labels)
 	if err != nil {
-		ctx.Error(500, "GetLabelsInRepoByIDs", err)
+		ctx.Error(http.StatusInternalServerError, "GetLabelsInRepoByIDs", err)
 		return
 	}
 
 	if err := issue.ReplaceLabels(labels, ctx.User); err != nil {
-		ctx.Error(500, "ReplaceLabels", err)
+		ctx.Error(http.StatusInternalServerError, "ReplaceLabels", err)
 		return
 	}
 
 	labels, err = models.GetLabelsByIssueID(issue.ID)
 	if err != nil {
-		ctx.Error(500, "GetLabelsByIssueID", err)
+		ctx.Error(http.StatusInternalServerError, "GetLabelsByIssueID", err)
 		return
 	}
 
 	for i := range labels {
 		apiLabels[i] = labels[i].APIFormat()
 	}
-	ctx.JSON(200, &apiLabels)
+	ctx.JSON(http.StatusOK, &apiLabels)
 }
 
 // ClearIssueLabels delete all the labels for an issue
 	// responses:
 	//   "204":
 	//     "$ref": "#/responses/empty"
+	//   "403":
+	//     "$ref": "#/responses/forbidden"
+
 	issue, err := models.GetIssueByIndex(ctx.Repo.Repository.ID, ctx.ParamsInt64(":index"))
 	if err != nil {
 		if models.IsErrIssueNotExist(err) {
 			ctx.NotFound()
 		} else {
-			ctx.Error(500, "GetIssueByIndex", err)
+			ctx.Error(http.StatusInternalServerError, "GetIssueByIndex", err)
 		}
 		return
 	}
 
 	if !ctx.Repo.CanWriteIssuesOrPulls(issue.IsPull) {
-		ctx.Status(403)
+		ctx.Status(http.StatusForbidden)
 		return
 	}
 
 	if err := issue_service.ClearLabels(issue, ctx.User); err != nil {
-		ctx.Error(500, "ClearLabels", err)
+		ctx.Error(http.StatusInternalServerError, "ClearLabels", err)
 		return
 	}
 
-	ctx.Status(204)
+	ctx.Status(http.StatusNoContent)
 }

routers/api/v1/repo/issue_reaction.go

 
 import (
 	"errors"
+	"net/http"
 
 	"code.gitea.io/gitea/models"
 	"code.gitea.io/gitea/modules/context"
 	// responses:
 	//   "200":
 	//     "$ref": "#/responses/ReactionResponseList"
+	//   "403":
+	//     "$ref": "#/responses/forbidden"
+
 	comment, err := models.GetCommentByID(ctx.ParamsInt64(":id"))
 	if err != nil {
 		if models.IsErrCommentNotExist(err) {
 			ctx.NotFound(err)
 		} else {
-			ctx.Error(500, "GetCommentByID", err)
+			ctx.Error(http.StatusInternalServerError, "GetCommentByID", err)
 		}
 		return
 	}
 
 	if !ctx.Repo.CanRead(models.UnitTypeIssues) && !ctx.User.IsAdmin {
-		ctx.Error(403, "GetIssueCommentReactions", errors.New("no permission to get reactions"))
+		ctx.Error(http.StatusForbidden, "GetIssueCommentReactions", errors.New("no permission to get reactions"))
 		return
 	}
 
 	reactions, err := models.FindCommentReactions(comment)
 	if err != nil {
-		ctx.Error(500, "FindIssueReactions", err)
+		ctx.Error(http.StatusInternalServerError, "FindIssueReactions", err)
 		return
 	}
 	_, err = reactions.LoadUsers()
 	if err != nil {
-		ctx.Error(500, "ReactionList.LoadUsers()", err)
+		ctx.Error(http.StatusInternalServerError, "ReactionList.LoadUsers()", err)
 		return
 	}
 
 		})
 	}
 
-	ctx.JSON(200, result)
+	ctx.JSON(http.StatusOK, result)
 }
 
 // PostIssueCommentReaction add a reaction to a comment of a issue
 	// responses:
 	//   "201":
 	//     "$ref": "#/responses/ReactionResponse"
+	//   "403":
+	//     "$ref": "#/responses/forbidden"
+
 	changeIssueCommentReaction(ctx, form, true)
 }
 
 	// responses:
 	//   "200":
 	//     "$ref": "#/responses/empty"
+	//   "403":
+	//     "$ref": "#/responses/forbidden"
+
 	changeIssueCommentReaction(ctx, form, false)
 }
 
 		if models.IsErrCommentNotExist(err) {
 			ctx.NotFound(err)
 		} else {
-			ctx.Error(500, "GetCommentByID", err)
+			ctx.Error(http.StatusInternalServerError, "GetCommentByID", err)
 		}
 		return
 	}
 
 	err = comment.LoadIssue()
 	if err != nil {
-		ctx.Error(500, "comment.LoadIssue() failed", err)
+		ctx.Error(http.StatusInternalServerError, "comment.LoadIssue() failed", err)
 	}
 
 	if comment.Issue.IsLocked && !ctx.Repo.CanWrite(models.UnitTypeIssues) && !ctx.User.IsAdmin {
-		ctx.Error(403, "ChangeIssueCommentReaction", errors.New("no permission to change reaction"))
+		ctx.Error(http.StatusForbidden, "ChangeIssueCommentReaction", errors.New("no permission to change reaction"))
 		return
 	}
 
 		reaction, err := models.CreateCommentReaction(ctx.User, comment.Issue, comment, form.Reaction)
 		if err != nil {
 			if models.IsErrForbiddenIssueReaction(err) {
-				ctx.Error(403, err.Error(), err)
+				ctx.Error(http.StatusForbidden, err.Error(), err)
 			} else {
-				ctx.Error(500, "CreateCommentReaction", err)
+				ctx.Error(http.StatusInternalServerError, "CreateCommentReaction", err)
 			}
 			return
 		}
 		_, err = reaction.LoadUser()
 		if err != nil {
-			ctx.Error(500, "Reaction.LoadUser()", err)
+			ctx.Error(http.StatusInternalServerError, "Reaction.LoadUser()", err)
 			return
 		}
 
-		ctx.JSON(201, api.ReactionResponse{
+		ctx.JSON(http.StatusCreated, api.ReactionResponse{
 			User:     reaction.User.APIFormat(),
 			Reaction: reaction.Type,
 			Created:  reaction.CreatedUnix.AsTime(),
 		// DeleteIssueCommentReaction part
 		err = models.DeleteCommentReaction(ctx.User, comment.Issue, comment, form.Reaction)
 		if err != nil {
-			ctx.Error(500, "DeleteCommentReaction", err)
+			ctx.Error(http.StatusInternalServerError, "DeleteCommentReaction", err)
 			return
 		}
-		ctx.Status(200)
+		//ToDo respond 204
+		ctx.Status(http.StatusOK)
 	}
 }
 
 	// responses:
 	//   "200":
 	//     "$ref": "#/responses/ReactionResponseList"
+	//   "403":
+	//     "$ref": "#/responses/forbidden"
+
 	issue, err := models.GetIssueWithAttrsByIndex(ctx.Repo.Repository.ID, ctx.ParamsInt64(":index"))
 	if err != nil {
 		if models.IsErrIssueNotExist(err) {
 			ctx.NotFound()
 		} else {
-			ctx.Error(500, "GetIssueByIndex", err)
+			ctx.Error(http.StatusInternalServerError, "GetIssueByIndex", err)
 		}
 		return
 	}
 
 	if !ctx.Repo.CanRead(models.UnitTypeIssues) && !ctx.User.IsAdmin {
-		ctx.Error(403, "GetIssueReactions", errors.New("no permission to get reactions"))
+		ctx.Error(http.StatusForbidden, "GetIssueReactions", errors.New("no permission to get reactions"))
 		return
 	}
 
 	reactions, err := models.FindIssueReactions(issue)
 	if err != nil {
-		ctx.Error(500, "FindIssueReactions", err)
+		ctx.Error(http.StatusInternalServerError, "FindIssueReactions", err)
 		return
 	}
 	_, err = reactions.LoadUsers()
 	if err != nil {
-		ctx.Error(500, "ReactionList.LoadUsers()", err)
+		ctx.Error(http.StatusInternalServerError, "ReactionList.LoadUsers()", err)
 		return
 	}
 
 		})
 	}
 
-	ctx.JSON(200, result)
+	ctx.JSON(http.StatusOK, result)
 }
 
 // PostIssueReaction add a reaction to a comment of a issue
 	// responses:
 	//   "201":
 	//     "$ref": "#/responses/ReactionResponse"
+	//   "403":
+	//     "$ref": "#/responses/forbidden"
+
 	changeIssueReaction(ctx, form, true)
 }
 
 	// responses:
 	//   "200":
 	//     "$ref": "#/responses/empty"
+	//   "403":
+	//     "$ref": "#/responses/forbidden"
+
 	changeIssueReaction(ctx, form, false)
 }
 
 		if models.IsErrIssueNotExist(err) {
 			ctx.NotFound()
 		} else {
-			ctx.Error(500, "GetIssueByIndex", err)
+			ctx.Error(http.StatusInternalServerError, "GetIssueByIndex", err)
 		}
 		return
 	}
 
 	if issue.IsLocked && !ctx.Repo.CanWrite(models.UnitTypeIssues) && !ctx.User.IsAdmin {
-		ctx.Error(403, "ChangeIssueCommentReaction", errors.New("no permission to change reaction"))
+		ctx.Error(http.StatusForbidden, "ChangeIssueCommentReaction", errors.New("no permission to change reaction"))
 		return
 	}
 
 		reaction, err := models.CreateIssueReaction(ctx.User, issue, form.Reaction)
 		if err != nil {
 			if models.IsErrForbiddenIssueReaction(err) {
-				ctx.Error(403, err.Error(), err)
+				ctx.Error(http.StatusForbidden, err.Error(), err)
 			} else {
-				ctx.Error(500, "CreateCommentReaction", err)
+				ctx.Error(http.StatusInternalServerError, "CreateCommentReaction", err)
 			}
 			return
 		}
 		_, err = reaction.LoadUser()
 		if err != nil {
-			ctx.Error(500, "Reaction.LoadUser()", err)
+			ctx.Error(http.StatusInternalServerError, "Reaction.LoadUser()", err)
 			return
 		}
 
-		ctx.JSON(201, api.ReactionResponse{
+		ctx.JSON(http.StatusCreated, api.ReactionResponse{
 			User:     reaction.User.APIFormat(),
 			Reaction: reaction.Type,
 			Created:  reaction.CreatedUnix.AsTime(),
 		// DeleteIssueReaction part
 		err = models.DeleteIssueReaction(ctx.User, issue, form.Reaction)
 		if err != nil {
-			ctx.Error(500, "DeleteIssueReaction", err)
+			ctx.Error(http.StatusInternalServerError, "DeleteIssueReaction", err)
 			return
 		}
-		ctx.Status(200)
+		//ToDo respond 204
+		ctx.Status(http.StatusOK)
 	}
 }

routers/api/v1/repo/issue_stopwatch.go

 package repo
 
 import (
+	"net/http"
+
 	"code.gitea.io/gitea/models"
 	"code.gitea.io/gitea/modules/context"
 )
 	//   "403":
 	//     description: Not repo writer, user does not have rights to toggle stopwatch
 	//   "404":
-	//     description: Issue not found
+	//     "$ref": "#/responses/notFound"
 	//   "409":
 	//     description: Cannot start a stopwatch again if it already exists
+
 	issue, err := prepareIssueStopwatch(ctx, false)
 	if err != nil {
 		return
 	}
 
 	if err := models.CreateOrStopIssueStopwatch(ctx.User, issue); err != nil {
-		ctx.Error(500, "CreateOrStopIssueStopwatch", err)
+		ctx.Error(http.StatusInternalServerError, "CreateOrStopIssueStopwatch", err)
 		return
 	}
 
-	ctx.Status(201)
+	ctx.Status(http.StatusCreated)
 }
 
 // StopIssueStopwatch stops a stopwatch for the given issue.
 	//   "403":
 	//     description: Not repo writer, user does not have rights to toggle stopwatch
 	//   "404":
-	//     description: Issue not found
+	//     "$ref": "#/responses/notFound"
 	//   "409":
 	//     description:  Cannot stop a non existent stopwatch
+
 	issue, err := prepareIssueStopwatch(ctx, true)
 	if err != nil {
 		return
 	}
 
 	if err := models.CreateOrStopIssueStopwatch(ctx.User, issue); err != nil {
-		ctx.Error(500, "CreateOrStopIssueStopwatch", err)
+		ctx.Error(http.StatusInternalServerError, "CreateOrStopIssueStopwatch", err)
 		return
 	}
 
-	ctx.Status(201)
+	ctx.Status(http.StatusCreated)
 }
 
 // DeleteIssueStopwatch delete a specific stopwatch
 	//   "403":
 	//     description: Not repo writer, user does not have rights to toggle stopwatch
 	//   "404":
-	//     description: Issue not found
+	//     "$ref": "#/responses/notFound"
 	//   "409":
 	//     description:  Cannot cancel a non existent stopwatch
+
 	issue, err := prepareIssueStopwatch(ctx, true)
 	if err != nil {
 		return
 	}
 
 	if err := models.CancelStopwatch(ctx.User, issue); err != nil {
-		ctx.Error(500, "CancelStopwatch", err)
+		ctx.Error(http.StatusInternalServerError, "CancelStopwatch", err)
 		return
 	}
 
-	ctx.Status(204)
+	ctx.Status(http.StatusNoContent)
 }
 
 func prepareIssueStopwatch(ctx *context.APIContext, shouldExist bool) (*models.Issue, error) {
 		if models.IsErrIssueNotExist(err) {
 			ctx.NotFound()
 		} else {
-			ctx.Error(500, "GetIssueByIndex", err)
+			ctx.Error(http.StatusInternalServerError, "GetIssueByIndex", err)
 		}
 
 		return nil, err
 	}
 
 	if !ctx.Repo.CanWrite(models.UnitTypeIssues) {
-		ctx.Status(403)
+		ctx.Status(http.StatusForbidden)
 		return nil, err
 	}
 
 	if !ctx.Repo.CanUseTimetracker(issue, ctx.User) {
-		ctx.Status(403)
+		ctx.Status(http.StatusForbidden)
 		return nil, err
 	}
 
 	if models.StopwatchExists(ctx.User.ID, issue.ID) != shouldExist {
 		if shouldExist {
-			ctx.Error(409, "StopwatchExists", "cannot stop/cancel a non existent stopwatch")
+			ctx.Error(http.StatusConflict, "StopwatchExists", "cannot stop/cancel a non existent stopwatch")
 		} else {
-			ctx.Error(409, "StopwatchExists", "cannot start a stopwatch again if it already exists")
+			ctx.Error(http.StatusConflict, "StopwatchExists", "cannot start a stopwatch again if it already exists")
 		}
 		return nil, err
 	}
 
 	sws, err := models.GetUserStopwatches(ctx.User.ID)
 	if err != nil {
-		ctx.Error(500, "GetUserStopwatches", err)
+		ctx.Error(http.StatusInternalServerError, "GetUserStopwatches", err)
 		return
 	}
 
 	apiSWs, err := sws.APIFormat()
 	if err != nil {
-		ctx.Error(500, "APIFormat", err)
+		ctx.Error(http.StatusInternalServerError, "APIFormat", err)
 		return
 	}
 
-	ctx.JSON(200, apiSWs)
+	ctx.JSON(http.StatusOK, apiSWs)
 }

routers/api/v1/repo/issue_subscription.go

 package repo
 
 import (
+	"net/http"
+
 	"code.gitea.io/gitea/models"
 	"code.gitea.io/gitea/modules/context"
 )
 	//   "304":
 	//     description: User can only subscribe itself if he is no admin
 	//   "404":
-	//     description: Issue not found
+	//     "$ref": "#/responses/notFound"
+
 	setIssueSubscription(ctx, true)
 }
 
 	//   "304":
 	//     description: User can only subscribe itself if he is no admin
 	//   "404":
-	//     description: Issue not found
+	//     "$ref": "#/responses/notFound"
+
 	setIssueSubscription(ctx, false)
 }
 
 		if models.IsErrIssueNotExist(err) {
 			ctx.NotFound()
 		} else {
-			ctx.Error(500, "GetIssueByIndex", err)
+			ctx.Error(http.StatusInternalServerError, "GetIssueByIndex", err)
 		}
 
 		return
 		if models.IsErrUserNotExist(err) {
 			ctx.NotFound()
 		} else {
-			ctx.Error(500, "GetUserByName", err)
+			ctx.Error(http.StatusInternalServerError, "GetUserByName", err)
 		}
 
 		return
 
 	//only admin and user for itself can change subscription
 	if user.ID != ctx.User.ID && !ctx.User.IsAdmin {
-		ctx.Error(403, "User", nil)
+		ctx.Error(http.StatusForbidden, "User", nil)
 		return
 	}
 
 	if err := models.CreateOrUpdateIssueWatch(user.ID, issue.ID, watch); err != nil {
-		ctx.Error(500, "CreateOrUpdateIssueWatch", err)
+		ctx.Error(http.StatusInternalServerError, "CreateOrUpdateIssueWatch", err)
 		return
 	}
 
-	ctx.Status(201)
+	ctx.Status(http.StatusCreated)
 }
 
 // GetIssueSubscribers return subscribers of an issue
 	//   "200":
 	//     "$ref": "#/responses/UserList"
 	//   "404":
-	//     description: Issue not found
+	//     "$ref": "#/responses/notFound"
+
 	issue, err := models.GetIssueByIndex(ctx.Repo.Repository.ID, ctx.ParamsInt64(":index"))
 	if err != nil {
 		if models.IsErrIssueNotExist(err) {
 			ctx.NotFound()
 		} else {
-			ctx.Error(500, "GetIssueByIndex", err)
+			ctx.Error(http.StatusInternalServerError, "GetIssueByIndex", err)
 		}
 
 		return
 
 	iwl, err := models.GetIssueWatchers(issue.ID)
 	if err != nil {
-		ctx.Error(500, "GetIssueWatchers", err)
+		ctx.Error(http.StatusInternalServerError, "GetIssueWatchers", err)
 		return
 	}
 
 	users, err := iwl.LoadWatchUsers()
 	if err != nil {
-		ctx.Error(500, "LoadWatchUsers", err)
+		ctx.Error(http.StatusInternalServerError, "LoadWatchUsers", err)
 		return
 	}
 
-	ctx.JSON(200, users.APIFormat())
+	ctx.JSON(http.StatusOK, users.APIFormat())
 }

routers/api/v1/repo/issue_tracked_time.go

 package repo
 
 import (
+	"net/http"
+
 	"code.gitea.io/gitea/models"
 	"code.gitea.io/gitea/modules/context"
 	api "code.gitea.io/gitea/modules/structs"
 	// responses:
 	//   "200":
 	//     "$ref": "#/responses/TrackedTimeList"
+	//   "404":
+	//     "$ref": "#/responses/notFound"
+
 	if !ctx.Repo.Repository.IsTimetrackerEnabled() {
 		ctx.NotFound("Timetracker is disabled")
 		return
 		if models.IsErrIssueNotExist(err) {
 			ctx.NotFound(err)
 		} else {
-			ctx.Error(500, "GetIssueByIndex", err)
+			ctx.Error(http.StatusInternalServerError, "GetIssueByIndex", err)
 		}
 		return
 	}
 
 	trackedTimes, err := models.GetTrackedTimes(models.FindTrackedTimesOptions{IssueID: issue.ID})
 	if err != nil {
-		ctx.Error(500, "GetTrackedTimesByIssue", err)
+		ctx.Error(http.StatusInternalServerError, "GetTrackedTimesByIssue", err)
 		return
 	}
 	apiTrackedTimes := trackedTimesToAPIFormat(trackedTimes)
-	ctx.JSON(200, &apiTrackedTimes)
+	ctx.JSON(http.StatusOK, &apiTrackedTimes)
 }
 
 // AddTime adds time manual to the given issue
 	//   "400":
 	//     "$ref": "#/responses/error"
 	//   "403":
-	//     "$ref": "#/responses/error"
+	//     "$ref": "#/responses/forbidden"
+
 	issue, err := models.GetIssueByIndex(ctx.Repo.Repository.ID, ctx.ParamsInt64(":index"))
 	if err != nil {
 		if models.IsErrIssueNotExist(err) {
 			ctx.NotFound(err)
 		} else {
-			ctx.Error(500, "GetIssueByIndex", err)
+			ctx.Error(http.StatusInternalServerError, "GetIssueByIndex", err)
 		}
 		return
 	}
 
 	if !ctx.Repo.CanUseTimetracker(issue, ctx.User) {
 		if !ctx.Repo.Repository.IsTimetrackerEnabled() {
-			ctx.JSON(400, struct{ Message string }{Message: "time tracking disabled"})
+			ctx.Error(http.StatusBadRequest, "", "time tracking disabled")
 			return
 		}
-		ctx.Status(403)
+		ctx.Status(http.StatusForbidden)
 		return
 	}
 	trackedTime, err := models.AddTime(ctx.User, issue, form.Time)
 	if err != nil {
-		ctx.Error(500, "AddTime", err)
+		ctx.Error(http.StatusInternalServerError, "AddTime", err)
 		return
 	}
-	ctx.JSON(200, trackedTime.APIFormat())
+	ctx.JSON(http.StatusOK, trackedTime.APIFormat())
 }
 
 // ListTrackedTimesByUser  lists all tracked times of the user
 	// responses:
 	//   "200":
 	//     "$ref": "#/responses/TrackedTimeList"
+	//   "400":
+	//     "$ref": "#/responses/error"
+
 	if !ctx.Repo.Repository.IsTimetrackerEnabled() {
-		ctx.JSON(400, struct{ Message string }{Message: "time tracking disabled"})
+		ctx.Error(http.StatusBadRequest, "", "time tracking disabled")
 		return
 	}
 	user, err := models.GetUserByName(ctx.Params(":timetrackingusername"))
 		if models.IsErrUserNotExist(err) {
 			ctx.NotFound(err)
 		} else {
-			ctx.Error(500, "GetUserByName", err)
+			ctx.Error(http.StatusInternalServerError, "GetUserByName", err)
 		}
 		return
 	}
 		UserID:       user.ID,
 		RepositoryID: ctx.Repo.Repository.ID})
 	if err != nil {
-		ctx.Error(500, "GetTrackedTimesByUser", err)
+		ctx.Error(http.StatusInternalServerError, "GetTrackedTimesByUser", err)
 		return
 	}
 	apiTrackedTimes := trackedTimesToAPIFormat(trackedTimes)
-	ctx.JSON(200, &apiTrackedTimes)
+	ctx.JSON(http.StatusOK, &apiTrackedTimes)
 }
 
 // ListTrackedTimesByRepository lists all tracked times of the repository
 	// responses:
 	//   "200":
 	//     "$ref": "#/responses/TrackedTimeList"
+	//   "400":
+	//     "$ref": "#/responses/error"
+
 	if !ctx.Repo.Repository.IsTimetrackerEnabled() {
-		ctx.JSON(400, struct{ Message string }{Message: "time tracking disabled"})
+		ctx.Error(http.StatusBadRequest, "", "time tracking disabled")
 		return
 	}
 	trackedTimes, err := models.GetTrackedTimes(models.FindTrackedTimesOptions{
 		RepositoryID: ctx.Repo.Repository.ID})
 	if err != nil {
-		ctx.Error(500, "GetTrackedTimesByUser", err)
+		ctx.Error(http.StatusInternalServerError, "GetTrackedTimesByUser", err)
 		return
 	}
 	apiTrackedTimes := trackedTimesToAPIFormat(trackedTimes)
-	ctx.JSON(200, &apiTrackedTimes)
+	ctx.JSON(http.StatusOK, &apiTrackedTimes)
 }
 
 // ListMyTrackedTimes lists all tracked times of the current user
 	// responses:
 	//   "200":
 	//     "$ref": "#/responses/TrackedTimeList"
+
 	trackedTimes, err := models.GetTrackedTimes(models.FindTrackedTimesOptions{UserID: ctx.User.ID})
 	if err != nil {
-		ctx.Error(500, "GetTrackedTimesByUser", err)
+		ctx.Error(http.StatusInternalServerError, "GetTrackedTimesByUser", err)
 		return
 	}
 	apiTrackedTimes := trackedTimesToAPIFormat(trackedTimes)
-	ctx.JSON(200, &apiTrackedTimes)
+	ctx.JSON(http.StatusOK, &apiTrackedTimes)
 }

routers/api/v1/repo/key.go

 
 import (
 	"fmt"
+	"net/http"
 
 	"code.gitea.io/gitea/models"
 	"code.gitea.io/gitea/modules/context"
 	// responses:
 	//   "200":
 	//     "$ref": "#/responses/DeployKeyList"
+
 	var keys []*models.DeployKey
 	var err error
 
 	}
 
 	if err != nil {
-		ctx.Error(500, "ListDeployKeys", err)
+		ctx.Error(http.StatusInternalServerError, "ListDeployKeys", err)
 		return
 	}
 
 	apiKeys := make([]*api.DeployKey, len(keys))
 	for i := range keys {
 		if err = keys[i].GetContent(); err != nil {
-			ctx.Error(500, "GetContent", err)
+			ctx.Error(http.StatusInternalServerError, "GetContent", err)
 			return
 		}
 		apiKeys[i] = convert.ToDeployKey(apiLink, keys[i])
 		}
 	}
 
-	ctx.JSON(200, &apiKeys)
+	ctx.JSON(http.StatusOK, &apiKeys)
 }
 
 // GetDeployKey get a deploy key by id
 	// responses:
 	//   "200":
 	//     "$ref": "#/responses/DeployKey"
+
 	key, err := models.GetDeployKeyByID(ctx.ParamsInt64(":id"))
 	if err != nil {
 		if models.IsErrDeployKeyNotExist(err) {
 			ctx.NotFound()
 		} else {
-			ctx.Error(500, "GetDeployKeyByID", err)
+			ctx.Error(http.StatusInternalServerError, "GetDeployKeyByID", err)
 		}
 		return
 	}
 
 	if err = key.GetContent(); err != nil {
-		ctx.Error(500, "GetContent", err)
+		ctx.Error(http.StatusInternalServerError, "GetContent", err)
 		return
 	}
 
 	if ctx.User.IsAdmin || ((ctx.Repo.Repository.ID == key.RepoID) && (ctx.User.ID == ctx.Repo.Owner.ID)) {
 		apiKey, _ = appendPrivateInformation(apiKey, key, ctx.Repo.Repository)
 	}
-	ctx.JSON(200, apiKey)
+	ctx.JSON(http.StatusOK, apiKey)
 }
 
 // HandleCheckKeyStringError handle check key error
 func HandleCheckKeyStringError(ctx *context.APIContext, err error) {
 	if models.IsErrSSHDisabled(err) {
-		ctx.Error(422, "", "SSH is disabled")
+		ctx.Error(http.StatusUnprocessableEntity, "", "SSH is disabled")
 	} else if models.IsErrKeyUnableVerify(err) {
-		ctx.Error(422, "", "Unable to verify key content")
+		ctx.Error(http.StatusUnprocessableEntity, "", "Unable to verify key content")
 	} else {
-		ctx.Error(422, "", fmt.Errorf("Invalid key content: %v", err))
+		ctx.Error(http.StatusUnprocessableEntity, "", fmt.Errorf("Invalid key content: %v", err))
 	}
 }
 
 func HandleAddKeyError(ctx *context.APIContext, err error) {
 	switch {
 	case models.IsErrDeployKeyAlreadyExist(err):
-		ctx.Error(422, "", "This key has already been added to this repository")
+		ctx.Error(http.StatusUnprocessableEntity, "", "This key has already been added to this repository")
 	case models.IsErrKeyAlreadyExist(err):
-		ctx.Error(422, "", "Key content has been used as non-deploy key")
+		ctx.Error(http.StatusUnprocessableEntity, "", "Key content has been used as non-deploy key")
 	case models.IsErrKeyNameAlreadyUsed(err):
-		ctx.Error(422, "", "Key title has been used")
+		ctx.Error(http.StatusUnprocessableEntity, "", "Key title has been used")
 	default:
-		ctx.Error(500, "AddKey", err)
+		ctx.Error(http.StatusInternalServerError, "AddKey", err)
 	}
 }
 
 	// responses:
 	//   "201":
 	//     "$ref": "#/responses/DeployKey"
+	//   "422":
+	//     "$ref": "#/responses/validationError"
+
 	content, err := models.CheckPublicKeyString(form.Key)
 	if err != nil {
 		HandleCheckKeyStringError(ctx, err)
 
 	key.Content = content
 	apiLink := composeDeployKeysAPILink(ctx.Repo.Owner.Name + "/" + ctx.Repo.Repository.Name)
-	ctx.JSON(201, convert.ToDeployKey(apiLink, key))
+	ctx.JSON(http.StatusCreated, convert.ToDeployKey(apiLink, key))
 }
 
 // DeleteDeploykey delete deploy key for a repository
 	// responses:
 	//   "204":
 	//     "$ref": "#/responses/empty"
+	//   "403":
+	//     "$ref": "#/responses/forbidden"
+
 	if err := models.DeleteDeployKey(ctx.User, ctx.ParamsInt64(":id")); err != nil {
 		if models.IsErrKeyAccessDenied(err) {
-			ctx.Error(403, "", "You do not have access to this key")
+			ctx.Error(http.StatusForbidden, "", "You do not have access to this key")
 		} else {
-			ctx.Error(500, "DeleteDeployKey", err)
+			ctx.Error(http.StatusInternalServerError, "DeleteDeployKey", err)
 		}
 		return
 	}
 
-	ctx.Status(204)
+	ctx.Status(http.StatusNoContent)
 }

routers/api/v1/repo/label.go

 package repo
 
 import (
+	"net/http"
 	"strconv"
 
 	"code.gitea.io/gitea/models"
 	// responses:
 	//   "200":
 	//     "$ref": "#/responses/LabelList"
+
 	labels, err := models.GetLabelsByRepoID(ctx.Repo.Repository.ID, ctx.Query("sort"))
 	if err != nil {
-		ctx.Error(500, "GetLabelsByRepoID", err)
+		ctx.Error(http.StatusInternalServerError, "GetLabelsByRepoID", err)
 		return
 	}
 
 	for i := range labels {
 		apiLabels[i] = labels[i].APIFormat()
 	}
-	ctx.JSON(200, &apiLabels)
+	ctx.JSON(http.StatusOK, &apiLabels)
 }
 
 // GetLabel get label by repository and label id
 	// responses:
 	//   "200":
 	//     "$ref": "#/responses/Label"
+
 	var (
 		label *models.Label
 		err   error
 		if models.IsErrLabelNotExist(err) {
 			ctx.NotFound()
 		} else {
-			ctx.Error(500, "GetLabelByRepoID", err)
+			ctx.Error(http.StatusInternalServerError, "GetLabelByRepoID", err)
 		}
 		return
 	}
 
-	ctx.JSON(200, label.APIFormat())
+	ctx.JSON(http.StatusOK, label.APIFormat())
 }
 
 // CreateLabel create a label for a repository
 	// responses:
 	//   "201":
 	//     "$ref": "#/responses/Label"
+
 	label := &models.Label{
 		Name:        form.Name,
 		Color:       form.Color,
 		Description: form.Description,
 	}
 	if err := models.NewLabel(label); err != nil {
-		ctx.Error(500, "NewLabel", err)
+		ctx.Error(http.StatusInternalServerError, "NewLabel", err)
 		return
 	}
-	ctx.JSON(201, label.APIFormat())
+	ctx.JSON(http.StatusCreated, label.APIFormat())
 }
 
 // EditLabel modify a label for a repository
 	// responses:
 	//   "200":
 	//     "$ref": "#/responses/Label"
+
 	label, err := models.GetLabelInRepoByID(ctx.Repo.Repository.ID, ctx.ParamsInt64(":id"))
 	if err != nil {
 		if models.IsErrLabelNotExist(err) {
 			ctx.NotFound()
 		} else {
-			ctx.Error(500, "GetLabelByRepoID", err)
+			ctx.Error(http.StatusInternalServerError, "GetLabelByRepoID", err)
 		}
 		return
 	}
 		ctx.ServerError("UpdateLabel", err)
 		return
 	}
-	ctx.JSON(200, label.APIFormat())
+	ctx.JSON(http.StatusOK, label.APIFormat())
 }
 
 // DeleteLabel delete a label for a repository
 	// responses:
 	//   "204":
 	//     "$ref": "#/responses/empty"
+
 	if err := models.DeleteLabel(ctx.Repo.Repository.ID, ctx.ParamsInt64(":id")); err != nil {
-		ctx.Error(500, "DeleteLabel", err)
+		ctx.Error(http.StatusInternalServerError, "DeleteLabel", err)
 		return
 	}
 
-	ctx.Status(204)
+	ctx.Status(http.StatusNoContent)
 }

routers/api/v1/repo/milestone.go

 package repo
 
 import (
+	"net/http"
 	"time"
 
 	"code.gitea.io/gitea/models"
 	// responses:
 	//   "200":
 	//     "$ref": "#/responses/MilestoneList"
+
 	milestones, err := models.GetMilestonesByRepoID(ctx.Repo.Repository.ID, api.StateType(ctx.Query("state")))
 	if err != nil {
-		ctx.Error(500, "GetMilestonesByRepoID", err)
+		ctx.Error(http.StatusInternalServerError, "GetMilestonesByRepoID", err)
 		return
 	}
 
 	for i := range milestones {
 		apiMilestones[i] = milestones[i].APIFormat()
 	}
-	ctx.JSON(200, &apiMilestones)
+	ctx.JSON(http.StatusOK, &apiMilestones)
 }
 
 // GetMilestone get a milestone for a repository
 	// responses:
 	//   "200":
 	//     "$ref": "#/responses/Milestone"
+
 	milestone, err := models.GetMilestoneByRepoID(ctx.Repo.Repository.ID, ctx.ParamsInt64(":id"))
 	if err != nil {
 		if models.IsErrMilestoneNotExist(err) {
 			ctx.NotFound()
 		} else {
-			ctx.Error(500, "GetMilestoneByRepoID", err)
+			ctx.Error(http.StatusInternalServerError, "GetMilestoneByRepoID", err)
 		}
 		return
 	}
-	ctx.JSON(200, milestone.APIFormat())
+	ctx.JSON(http.StatusOK, milestone.APIFormat())
 }
 
 // CreateMilestone create a milestone for a repository
 	// responses:
 	//   "201":
 	//     "$ref": "#/responses/Milestone"
+
 	if form.Deadline == nil {
 		defaultDeadline, _ := time.ParseInLocation("2006-01-02", "9999-12-31", time.Local)
 		form.Deadline = &defaultDeadline
 	}
 
 	if err := models.NewMilestone(milestone); err != nil {
-		ctx.Error(500, "NewMilestone", err)
+		ctx.Error(http.StatusInternalServerError, "NewMilestone", err)
 		return
 	}
-	ctx.JSON(201, milestone.APIFormat())
+	ctx.JSON(http.StatusCreated, milestone.APIFormat())
 }
 
 // EditMilestone modify a milestone for a repository
 	// responses:
 	//   "200":
 	//     "$ref": "#/responses/Milestone"
+
 	milestone, err := models.GetMilestoneByRepoID(ctx.Repo.Repository.ID, ctx.ParamsInt64(":id"))
 	if err != nil {
 		if models.IsErrMilestoneNotExist(err) {
 			ctx.NotFound()
 		} else {
-			ctx.Error(500, "GetMilestoneByRepoID", err)
+			ctx.Error(http.StatusInternalServerError, "GetMilestoneByRepoID", err)
 		}
 		return
 	}
 		ctx.ServerError("UpdateMilestone", err)
 		return
 	}
-	ctx.JSON(200, milestone.APIFormat())
+	ctx.JSON(http.StatusOK, milestone.APIFormat())
 }
 
 // DeleteMilestone delete a milestone for a repository
 	// responses:
 	//   "204":
 	//     "$ref": "#/responses/empty"
+
 	if err := models.DeleteMilestoneByRepoID(ctx.Repo.Repository.ID, ctx.ParamsInt64(":id")); err != nil {
-		ctx.Error(500, "DeleteMilestoneByRepoID", err)
+		ctx.Error(http.StatusInternalServerError, "DeleteMilestoneByRepoID", err)
 		return
 	}
-	ctx.Status(204)
+	ctx.Status(http.StatusNoContent)
 }

routers/api/v1/repo/pull.go

 	// responses:
 	//   "200":
 	//     "$ref": "#/responses/PullRequestList"
+
 	prs, maxResults, err := models.PullRequests(ctx.Repo.Repository.ID, &models.PullRequestsOptions{
 		Page:        ctx.QueryInt("page"),
 		State:       ctx.QueryTrim("state"),
 	})
 
 	if err != nil {
-		ctx.Error(500, "PullRequests", err)
+		ctx.Error(http.StatusInternalServerError, "PullRequests", err)
 		return
 	}
 
 	apiPrs := make([]*api.PullRequest, len(prs))
 	for i := range prs {
 		if err = prs[i].LoadIssue(); err != nil {
-			ctx.Error(500, "LoadIssue", err)
+			ctx.Error(http.StatusInternalServerError, "LoadIssue", err)
 			return
 		}
 		if err = prs[i].LoadAttributes(); err != nil {
-			ctx.Error(500, "LoadAttributes", err)
+			ctx.Error(http.StatusInternalServerError, "LoadAttributes", err)
 			return
 		}
 		if err = prs[i].GetBaseRepo(); err != nil {
-			ctx.Error(500, "GetBaseRepo", err)
+			ctx.Error(http.StatusInternalServerError, "GetBaseRepo", err)
 			return
 		}
 		if err = prs[i].GetHeadRepo(); err != nil {
-			ctx.Error(500, "GetHeadRepo", err)
+			ctx.Error(http.StatusInternalServerError, "GetHeadRepo", err)
 			return
 		}
 		apiPrs[i] = prs[i].APIFormat()
 	}
 
 	ctx.SetLinkHeader(int(maxResults), models.ItemsPerPage)
-	ctx.JSON(200, &apiPrs)
+	ctx.JSON(http.StatusOK, &apiPrs)
 }
 
 // GetPullRequest returns a single PR based on index
 	// responses:
 	//   "200":
 	//     "$ref": "#/responses/PullRequest"
+
 	pr, err := models.GetPullRequestByIndex(ctx.Repo.Repository.ID, ctx.ParamsInt64(":index"))
 	if err != nil {
 		if models.IsErrPullRequestNotExist(err) {
 			ctx.NotFound()
 		} else {
-			ctx.Error(500, "GetPullRequestByIndex", err)
+			ctx.Error(http.StatusInternalServerError, "GetPullRequestByIndex", err)
 		}
 		return
 	}
 
 	if err = pr.GetBaseRepo(); err != nil {
-		ctx.Error(500, "GetBaseRepo", err)
+		ctx.Error(http.StatusInternalServerError, "GetBaseRepo", err)
 		return
 	}
 	if err = pr.GetHeadRepo(); err != nil {
-		ctx.Error(500, "GetHeadRepo", err)
+		ctx.Error(http.StatusInternalServerError, "GetHeadRepo", err)
 		return
 	}
-	ctx.JSON(200, pr.APIFormat())
+	ctx.JSON(http.StatusOK, pr.APIFormat())
 }
 
 // CreatePullRequest does what it says
 	// responses:
 	//   "201":
 	//     "$ref": "#/responses/PullRequest"
+	//   "409":
+	//     "$ref": "#/responses/error"
+	//   "422":
+	//     "$ref": "#/responses/validationError"
+
 	var (
 		repo        = ctx.Repo.Repository
 		labelIDs    []int64
 	existingPr, err := models.GetUnmergedPullRequest(headRepo.ID, ctx.Repo.Repository.ID, headBranch, baseBranch)
 	if err != nil {
 		if !models.IsErrPullRequestNotExist(err) {
-			ctx.Error(500, "GetUnmergedPullRequest", err)
+			ctx.Error(http.StatusInternalServerError, "GetUnmergedPullRequest", err)
 			return
 		}
 	} else {
 			HeadBranch: existingPr.HeadBranch,
 			BaseBranch: existingPr.BaseBranch,
 		}
-		ctx.Error(409, "GetUnmergedPullRequest", err)
+		ctx.Error(http.StatusConflict, "GetUnmergedPullRequest", err)
 		return
 	}
 
 	if len(form.Labels) > 0 {
 		labels, err := models.GetLabelsInRepoByIDs(ctx.Repo.Repository.ID, form.Labels)
 		if err != nil {
-			ctx.Error(500, "GetLabelsInRepoByIDs", err)
+			ctx.Error(http.StatusInternalServerError, "GetLabelsInRepoByIDs", err)
 			return
 		}
 
 			if models.IsErrMilestoneNotExist(err) {
 				ctx.NotFound()
 			} else {
-				ctx.Error(500, "GetMilestoneByRepoID", err)
+				ctx.Error(http.StatusInternalServerError, "GetMilestoneByRepoID", err)
 			}
 			return
 		}
 	assigneeIDs, err := models.MakeIDsFromAPIAssigneesToAdd(form.Assignee, form.Assignees)
 	if err != nil {
 		if models.IsErrUserNotExist(err) {
-			ctx.Error(422, "", fmt.Sprintf("Assignee does not exist: [name: %s]", err))
+			ctx.Error(http.StatusUnprocessableEntity, "", fmt.Sprintf("Assignee does not exist: [name: %s]", err))
 		} else {
-			ctx.Error(500, "AddAssigneeByName", err)
+			ctx.Error(http.StatusInternalServerError, "AddAssigneeByName", err)
 		}
 		return
 	}
 	for _, aID := range assigneeIDs {
 		assignee, err := models.GetUserByID(aID)
 		if err != nil {
-			ctx.Error(500, "GetUserByID", err)
+			ctx.Error(http.StatusInternalServerError, "GetUserByID", err)
 			return
 		}
 
 		valid, err := models.CanBeAssigned(assignee, repo, true)
 		if err != nil {
-			ctx.Error(500, "canBeAssigned", err)
+			ctx.Error(http.StatusInternalServerError, "canBeAssigned", err)
 			return
 		}
 		if !valid {
-			ctx.Error(422, "canBeAssigned", models.ErrUserDoesNotHaveAccessToRepo{UserID: aID, RepoName: repo.Name})
+			ctx.Error(http.StatusUnprocessableEntity, "canBeAssigned", models.ErrUserDoesNotHaveAccessToRepo{UserID: aID, RepoName: repo.Name})
 			return
 		}
 	}
 
 	if err := pull_service.NewPullRequest(repo, prIssue, labelIDs, []string{}, pr, assigneeIDs); err != nil {
 		if models.IsErrUserDoesNotHaveAccessToRepo(err) {
-			ctx.Error(400, "UserDoesNotHaveAccessToRepo", err)
+			ctx.Error(http.StatusBadRequest, "UserDoesNotHaveAccessToRepo", err)
 			return
 		}
-		ctx.Error(500, "NewPullRequest", err)
+		ctx.Error(http.StatusInternalServerError, "NewPullRequest", err)
 		return
 	}
 
 	notification.NotifyNewPullRequest(pr)
 
 	log.Trace("Pull request created: %d/%d", repo.ID, prIssue.ID)
-	ctx.JSON(201, pr.APIFormat())
+	ctx.JSON(http.StatusCreated, pr.APIFormat())
 }
 
 // EditPullRequest does what it says
 	// responses:
 	//   "201":
 	//     "$ref": "#/responses/PullRequest"
+	//   "403":
+	//     "$ref": "#/responses/forbidden"
+	//   "412":
+	//     "$ref": "#/responses/error"
+	//   "422":
+	//     "$ref": "#/responses/validationError"
+
 	pr, err := models.GetPullRequestByIndex(ctx.Repo.Repository.ID, ctx.ParamsInt64(":index"))
 	if err != nil {
 		if models.IsErrPullRequestNotExist(err) {
 			ctx.NotFound()
 		} else {
-			ctx.Error(500, "GetPullRequestByIndex", err)
+			ctx.Error(http.StatusInternalServerError, "GetPullRequestByIndex", err)
 		}
 		return
 	}
 	issue.Repo = ctx.Repo.Repository
 
 	if !issue.IsPoster(ctx.User.ID) && !ctx.Repo.CanWrite(models.UnitTypePullRequests) {
-		ctx.Status(403)
+		ctx.Status(http.StatusForbidden)
 		return
 	}
 
 		}
 
 		if err := models.UpdateIssueDeadline(issue, deadlineUnix, ctx.User); err != nil {
-			ctx.Error(500, "UpdateIssueDeadline", err)
+			ctx.Error(http.StatusInternalServerError, "UpdateIssueDeadline", err)
 			return
 		}
 		issue.DeadlineUnix = deadlineUnix
 		err = issue_service.UpdateAssignees(issue, form.Assignee, form.Assignees, ctx.User)
 		if err != nil {
 			if models.IsErrUserNotExist(err) {
-				ctx.Error(422, "", fmt.Sprintf("Assignee does not exist: [name: %s]", err))
+				ctx.Error(http.StatusUnprocessableEntity, "", fmt.Sprintf("Assignee does not exist: [name: %s]", err))
 			} else {
-				ctx.Error(500, "UpdateAssignees", err)
+				ctx.Error(http.StatusInternalServerError, "UpdateAssignees", err)
 			}
 			return
 		}
 		oldMilestoneID := issue.MilestoneID
 		issue.MilestoneID = form.Milestone
 		if err = issue_service.ChangeMilestoneAssign(issue, ctx.User, oldMilestoneID); err != nil {
-			ctx.Error(500, "ChangeMilestoneAssign", err)
+			ctx.Error(http.StatusInternalServerError, "ChangeMilestoneAssign", err)
 			return
 		}
 	}
 	if ctx.Repo.CanWrite(models.UnitTypePullRequests) && form.Labels != nil {
 		labels, err := models.GetLabelsInRepoByIDs(ctx.Repo.Repository.ID, form.Labels)
 		if err != nil {
-			ctx.Error(500, "GetLabelsInRepoByIDsError", err)
+			ctx.Error(http.StatusInternalServerError, "GetLabelsInRepoByIDsError", err)
 			return
 		}
 		if err = issue.ReplaceLabels(labels, ctx.User); err != nil {
-			ctx.Error(500, "ReplaceLabelsError", err)
+			ctx.Error(http.StatusInternalServerError, "ReplaceLabelsError", err)
 			return
 		}
 	}
 
 	if err = models.UpdateIssue(issue); err != nil {
-		ctx.Error(500, "UpdateIssue", err)
+		ctx.Error(http.StatusInternalServerError, "UpdateIssue", err)
 		return
 	}
 	if form.State != nil {
 				ctx.Error(http.StatusPreconditionFailed, "DependenciesLeft", "cannot close this pull request because it still has open dependencies")
 				return
 			}
-			ctx.Error(500, "ChangeStatus", err)
+			ctx.Error(http.StatusInternalServerError, "ChangeStatus", err)
 			return
 		}
 	}
 		if models.IsErrPullRequestNotExist(err) {
 			ctx.NotFound()
 		} else {
-			ctx.Error(500, "GetPullRequestByIndex", err)
+			ctx.Error(http.StatusInternalServerError, "GetPullRequestByIndex", err)
 		}
 		return
 	}
 
 	// TODO this should be 200, not 201
-	ctx.JSON(201, pr.APIFormat())
+	ctx.JSON(http.StatusCreated, pr.APIFormat())
 }
 
 // IsPullRequestMerged checks if a PR exists given an index
 	//     description: pull request has been merged
 	//   "404":
 	//     description: pull request has not been merged
+
 	pr, err := models.GetPullRequestByIndex(ctx.Repo.Repository.ID, ctx.ParamsInt64(":index"))
 	if err != nil {
 		if models.IsErrPullRequestNotExist(err) {
 			ctx.NotFound()
 		} else {
-			ctx.Error(500, "GetPullRequestByIndex", err)
+			ctx.Error(http.StatusInternalServerError, "GetPullRequestByIndex", err)
 		}
 		return
 	}
 
 	if pr.HasMerged {
-		ctx.Status(204)
+		ctx.Status(http.StatusNoContent)
 	}
 	ctx.NotFound()
 }
 	//     "$ref": "#/responses/empty"
 	//   "405":
 	//     "$ref": "#/responses/empty"
+	//   "409":
+	//     "$ref": "#/responses/error"
+
 	pr, err := models.GetPullRequestByIndex(ctx.Repo.Repository.ID, ctx.ParamsInt64(":index"))
 	if err != nil {
 		if models.IsErrPullRequestNotExist(err) {
 			ctx.NotFound("GetPullRequestByIndex", err)
 		} else {
-			ctx.Error(500, "GetPullRequestByIndex", err)
+			ctx.Error(http.StatusInternalServerError, "GetPullRequestByIndex", err)
 		}
 		return
 	}
 	if ctx.IsSigned {
 		// Update issue-user.
 		if err = pr.Issue.ReadBy(ctx.User.ID); err != nil {
-			ctx.Error(500, "ReadBy", err)
+			ctx.Error(http.StatusInternalServerError, "ReadBy", err)
 			return
 		}
 	}
 	}
 
 	if !pr.CanAutoMerge() || pr.HasMerged || pr.IsWorkInProgress() {
-		ctx.Status(405)
+		ctx.Status(http.StatusMethodNotAllowed)
 		return
 	}
 
 	isPass, err := pull_service.IsPullCommitStatusPass(pr)
 	if err != nil {
-		ctx.Error(500, "IsPullCommitStatusPass", err)
+		ctx.Error(http.StatusInternalServerError, "IsPullCommitStatusPass", err)
 		return
 	}
 
 	if !isPass && !ctx.IsUserRepoAdmin() {
-		ctx.Status(405)
+		ctx.Status(http.StatusMethodNotAllowed)
 		return
 	}
 
 
 	if err := pull_service.Merge(pr, ctx.User, ctx.Repo.GitRepo, models.MergeStyle(form.Do), message); err != nil {
 		if models.IsErrInvalidMergeStyle(err) {
-			ctx.Status(405)
+			ctx.Status(http.StatusMethodNotAllowed)
 			return
 		} else if models.IsErrMergeConflicts(err) {
 			conflictError := err.(models.ErrMergeConflicts)
 			conflictError := err.(models.ErrMergeUnrelatedHistories)
 			ctx.JSON(http.StatusConflict, conflictError)
 		} else if models.IsErrMergePushOutOfDate(err) {
-			ctx.Status(http.StatusConflict)
+			ctx.Error(http.StatusConflict, "Merge", "merge push out of date")
 			return
 		}
-		ctx.Error(500, "Merge", err)
+		ctx.Error(http.StatusInternalServerError, "Merge", err)
 		return
 	}
 
 	log.Trace("Pull request merged: %d", pr.ID)
-	ctx.Status(200)
+	ctx.Status(http.StatusOK)
 }
 
 func parseCompareInfo(ctx *context.APIContext, form api.CreatePullRequestOption) (*models.User, *models.Repository, *git.Repository, *git.CompareInfo, string, string) {
 	} else {
 		headGitRepo, err = git.OpenRepository(models.RepoPath(headUser.Name, headRepo.Name))
 		if err != nil {
-			ctx.Error(500, "OpenRepository", err)
+			ctx.Error(http.StatusInternalServerError, "OpenRepository", err)
 			return nil, nil, nil, nil, "", ""
 		}
 	}
 	compareInfo, err := headGitRepo.GetCompareInfo(models.RepoPath(baseRepo.Owner.Name, baseRepo.Name), baseBranch, headBranch)
 	if err != nil {
 		headGitRepo.Close()
-		ctx.Error(500, "GetCompareInfo", err)
+		ctx.Error(http.StatusInternalServerError, "GetCompareInfo", err)
 		return nil, nil, nil, nil, "", ""
 	}
 

routers/api/v1/repo/release.go

 package repo
 
 import (
+	"net/http"
+
 	"code.gitea.io/gitea/models"
 	"code.gitea.io/gitea/modules/context"
 	"code.gitea.io/gitea/modules/setting"
 	// responses:
 	//   "200":
 	//     "$ref": "#/responses/Release"
+
 	id := ctx.ParamsInt64(":id")
 	release, err := models.GetReleaseByID(id)
 	if err != nil {
-		ctx.Error(500, "GetReleaseByID", err)
+		ctx.Error(http.StatusInternalServerError, "GetReleaseByID", err)
 		return
 	}
 	if release.RepoID != ctx.Repo.Repository.ID {
 		return
 	}
 	if err := release.LoadAttributes(); err != nil {
-		ctx.Error(500, "LoadAttributes", err)
+		ctx.Error(http.StatusInternalServerError, "LoadAttributes", err)
 		return
 	}
-	ctx.JSON(200, release.APIFormat())
+	ctx.JSON(http.StatusOK, release.APIFormat())
 }
 
 func getPagesInfo(ctx *context.APIContext) (int, int) {
 	// responses:
 	//   "200":
 	//     "$ref": "#/responses/ReleaseList"
+
 	page, limit := getPagesInfo(ctx)
 	releases, err := models.GetReleasesByRepoID(ctx.Repo.Repository.ID, models.FindReleasesOptions{
 		IncludeDrafts: ctx.Repo.AccessMode >= models.AccessModeWrite,
 		IncludeTags:   false,
 	}, page, limit)
 	if err != nil {
-		ctx.Error(500, "GetReleasesByRepoID", err)
+		ctx.Error(http.StatusInternalServerError, "GetReleasesByRepoID", err)
 		return
 	}
 	rels := make([]*api.Release, len(releases))
 	for i, release := range releases {
 		if err := release.LoadAttributes(); err != nil {
-			ctx.Error(500, "LoadAttributes", err)
+			ctx.Error(http.StatusInternalServerError, "LoadAttributes", err)
 			return
 		}
 		rels[i] = release.APIFormat()
 	}
-	ctx.JSON(200, rels)
+	ctx.JSON(http.StatusOK, rels)
 }
 
 // CreateRelease create a release
 	// responses:
 	//   "201":
 	//     "$ref": "#/responses/Release"
+	//   "409":
+	//     "$ref": "#/responses/error"
+
 	rel, err := models.GetRelease(ctx.Repo.Repository.ID, form.TagName)
 	if err != nil {
 		if !models.IsErrReleaseNotExist(err) {
 		}
 		if err := releaseservice.CreateRelease(ctx.Repo.GitRepo, rel, nil); err != nil {
 			if models.IsErrReleaseAlreadyExist(err) {
-				ctx.Status(409)
+				ctx.Error(http.StatusConflict, "ReleaseAlreadyExist", err)
 			} else {
-				ctx.Error(500, "CreateRelease", err)
+				ctx.Error(http.StatusInternalServerError, "CreateRelease", err)
 			}
 			return
 		}
 	} else {
 		if !rel.IsTag {
-			ctx.Status(409)
+			ctx.Error(http.StatusConflict, "GetRelease", "Release is has no Tag")
 			return
 		}
 
 			return
 		}
 	}
-	ctx.JSON(201, rel.APIFormat())
+	ctx.JSON(http.StatusCreated, rel.APIFormat())
 }
 
 // EditRelease edit a release
 	// responses:
 	//   "200":
 	//     "$ref": "#/responses/Release"
+
 	id := ctx.ParamsInt64(":id")
 	rel, err := models.GetReleaseByID(id)
 	if err != nil && !models.IsErrReleaseNotExist(err) {
-		ctx.Error(500, "GetReleaseByID", err)
+		ctx.Error(http.StatusInternalServerError, "GetReleaseByID", err)
 		return
 	}
 	if err != nil && models.IsErrReleaseNotExist(err) ||
 		rel.IsPrerelease = *form.IsPrerelease
 	}
 	if err := releaseservice.UpdateRelease(ctx.User, ctx.Repo.GitRepo, rel, nil); err != nil {
-		ctx.Error(500, "UpdateRelease", err)
+		ctx.Error(http.StatusInternalServerError, "UpdateRelease", err)
 		return
 	}
 
 	rel, err = models.GetReleaseByID(id)
 	if err != nil {
-		ctx.Error(500, "GetReleaseByID", err)
+		ctx.Error(http.StatusInternalServerError, "GetReleaseByID", err)
 		return
 	}
 	if err := rel.LoadAttributes(); err != nil {
-		ctx.Error(500, "LoadAttributes", err)
+		ctx.Error(http.StatusInternalServerError, "LoadAttributes", err)
 		return
 	}
-	ctx.JSON(200, rel.APIFormat())
+	ctx.JSON(http.StatusOK, rel.APIFormat())
 }
 
 // DeleteRelease delete a release from a repository
 	// responses:
 	//   "204":
 	//     "$ref": "#/responses/empty"
+
 	id := ctx.ParamsInt64(":id")
 	rel, err := models.GetReleaseByID(id)
 	if err != nil && !models.IsErrReleaseNotExist(err) {
-		ctx.Error(500, "GetReleaseByID", err)
+		ctx.Error(http.StatusInternalServerError, "GetReleaseByID", err)
 		return
 	}
 	if err != nil && models.IsErrReleaseNotExist(err) ||
 		return
 	}
 	if err := releaseservice.DeleteReleaseByID(id, ctx.User, false); err != nil {
-		ctx.Error(500, "DeleteReleaseByID", err)
+		ctx.Error(http.StatusInternalServerError, "DeleteReleaseByID", err)
 		return
 	}
-	ctx.Status(204)
+	ctx.Status(http.StatusNoContent)
 }

routers/api/v1/repo/release_attachment.go

 package repo
 
 import (
+	"net/http"
 	"strings"
 
 	"code.gitea.io/gitea/models"
 	// responses:
 	//   "200":
 	//     "$ref": "#/responses/Attachment"
+
 	releaseID := ctx.ParamsInt64(":id")
 	attachID := ctx.ParamsInt64(":asset")
 	attach, err := models.GetAttachmentByID(attachID)
 	if err != nil {
-		ctx.Error(500, "GetAttachmentByID", err)
+		ctx.Error(http.StatusInternalServerError, "GetAttachmentByID", err)
 		return
 	}
 	if attach.ReleaseID != releaseID {
 		return
 	}
 	// FIXME Should prove the existence of the given repo, but results in unnecessary database requests
-	ctx.JSON(200, attach.APIFormat())
+	ctx.JSON(http.StatusOK, attach.APIFormat())
 }
 
 // ListReleaseAttachments lists all attachments of the release
 	// responses:
 	//   "200":
 	//     "$ref": "#/responses/AttachmentList"
+
 	releaseID := ctx.ParamsInt64(":id")
 	release, err := models.GetReleaseByID(releaseID)
 	if err != nil {
-		ctx.Error(500, "GetReleaseByID", err)
+		ctx.Error(http.StatusInternalServerError, "GetReleaseByID", err)
 		return
 	}
 	if release.RepoID != ctx.Repo.Repository.ID {
 		return
 	}
 	if err := release.LoadAttributes(); err != nil {
-		ctx.Error(500, "LoadAttributes", err)
+		ctx.Error(http.StatusInternalServerError, "LoadAttributes", err)
 		return
 	}
-	ctx.JSON(200, release.APIFormat().Attachments)
+	ctx.JSON(http.StatusOK, release.APIFormat().Attachments)
 }
 
 // CreateReleaseAttachment creates an attachment and saves the given file
 	// responses:
 	//   "201":
 	//     "$ref": "#/responses/Attachment"
+	//   "400":
+	//     "$ref": "#/responses/error"
 
 	// Check if attachments are enabled
 	if !setting.AttachmentEnabled {
 	releaseID := ctx.ParamsInt64(":id")
 	release, err := models.GetReleaseByID(releaseID)
 	if err != nil {
-		ctx.Error(500, "GetReleaseByID", err)
+		ctx.Error(http.StatusInternalServerError, "GetReleaseByID", err)
 		return
 	}
 
 	// Get uploaded file from request
 	file, header, err := ctx.GetFile("attachment")
 	if err != nil {
-		ctx.Error(500, "GetFile", err)
+		ctx.Error(http.StatusInternalServerError, "GetFile", err)
 		return
 	}
 	defer file.Close()
 	// Check if the filetype is allowed by the settings
 	err = upload.VerifyAllowedContentType(buf, strings.Split(setting.AttachmentAllowedTypes, ","))
 	if err != nil {
-		ctx.Error(400, "DetectContentType", err)
+		ctx.Error(http.StatusBadRequest, "DetectContentType", err)
 		return
 	}
 
 		ReleaseID:  release.ID,
 	}, buf, file)
 	if err != nil {
-		ctx.Error(500, "NewAttachment", err)
+		ctx.Error(http.StatusInternalServerError, "NewAttachment", err)
 		return
 	}
 
-	ctx.JSON(201, attach.APIFormat())
+	ctx.JSON(http.StatusCreated, attach.APIFormat())
 }
 
 // EditReleaseAttachment updates the given attachment
 	attachID := ctx.ParamsInt64(":asset")
 	attach, err := models.GetAttachmentByID(attachID)
 	if err != nil {
-		ctx.Error(500, "GetAttachmentByID", err)
+		ctx.Error(http.StatusInternalServerError, "GetAttachmentByID", err)
 		return
 	}
 	if attach.ReleaseID != releaseID {
 	}
 
 	if err := models.UpdateAttachment(attach); err != nil {
-		ctx.Error(500, "UpdateAttachment", attach)
+		ctx.Error(http.StatusInternalServerError, "UpdateAttachment", attach)
 	}
-	ctx.JSON(201, attach.APIFormat())
+	ctx.JSON(http.StatusCreated, attach.APIFormat())
 }
 
 // DeleteReleaseAttachment delete a given attachment
 	attachID := ctx.ParamsInt64(":asset")
 	attach, err := models.GetAttachmentByID(attachID)
 	if err != nil {
-		ctx.Error(500, "GetAttachmentByID", err)
+		ctx.Error(http.StatusInternalServerError, "GetAttachmentByID", err)
 		return
 	}
 	if attach.ReleaseID != releaseID {
 	// FIXME Should prove the existence of the given repo, but results in unnecessary database requests
 
 	if err := models.DeleteAttachment(attach, true); err != nil {
-		ctx.Error(500, "DeleteAttachment", err)
+		ctx.Error(http.StatusInternalServerError, "DeleteAttachment", err)
 		return
 	}
-	ctx.Status(204)
+	ctx.Status(http.StatusNoContent)
 }

routers/api/v1/repo/repo.go

 	//     "$ref": "#/responses/SearchResults"
 	//   "422":
 	//     "$ref": "#/responses/validationError"
+
 	opts := &models.SearchRepoOptions{
 		Keyword:            strings.Trim(ctx.Query("q"), " "),
 		OwnerID:            ctx.QueryInt64("uid"),
 	var err error
 	repos, count, err := models.SearchRepository(opts)
 	if err != nil {
-		ctx.JSON(500, api.SearchError{
+		ctx.JSON(http.StatusInternalServerError, api.SearchError{
 			OK:    false,
 			Error: err.Error(),
 		})
 	results := make([]*api.Repository, len(repos))
 	for i, repo := range repos {
 		if err = repo.GetOwner(); err != nil {
-			ctx.JSON(500, api.SearchError{
+			ctx.JSON(http.StatusInternalServerError, api.SearchError{
 				OK:    false,
 				Error: err.Error(),
 			})
 		}
 		accessMode, err := models.AccessLevel(ctx.User, repo)
 		if err != nil {
-			ctx.JSON(500, api.SearchError{
+			ctx.JSON(http.StatusInternalServerError, api.SearchError{
 				OK:    false,
 				Error: err.Error(),
 			})
 
 	ctx.SetLinkHeader(int(count), setting.API.MaxResponseItems)
 	ctx.Header().Set("X-Total-Count", fmt.Sprintf("%d", count))
-	ctx.JSON(200, api.SearchResults{
+	ctx.JSON(http.StatusOK, api.SearchResults{
 		OK:   true,
 		Data: results,
 	})
 	})
 	if err != nil {
 		if models.IsErrRepoAlreadyExist(err) {
-			ctx.Error(409, "", "The repository with the same name already exists.")
+			ctx.Error(http.StatusConflict, "", "The repository with the same name already exists.")
 		} else if models.IsErrNameReserved(err) ||
 			models.IsErrNamePatternNotAllowed(err) {
-			ctx.Error(422, "", err)
+			ctx.Error(http.StatusUnprocessableEntity, "", err)
 		} else {
-			ctx.Error(500, "CreateRepository", err)
+			ctx.Error(http.StatusInternalServerError, "CreateRepository", err)
 		}
 		return
 	}
 
-	ctx.JSON(201, repo.APIFormat(models.AccessModeOwner))
+	ctx.JSON(http.StatusCreated, repo.APIFormat(models.AccessModeOwner))
 }
 
 // Create one repository of mine
 	//     description: The repository with the same name already exists.
 	//   "422":
 	//     "$ref": "#/responses/validationError"
+
 	if ctx.User.IsOrganization() {
 		// Shouldn't reach this condition, but just in case.
-		ctx.Error(422, "", "not allowed creating repository for organization")
+		ctx.Error(http.StatusUnprocessableEntity, "", "not allowed creating repository for organization")
 		return
 	}
 	CreateUserRepo(ctx, ctx.User, opt)
 	//     "$ref": "#/responses/validationError"
 	//   "403":
 	//     "$ref": "#/responses/forbidden"
+
 	org, err := models.GetOrgByName(ctx.Params(":org"))
 	if err != nil {
 		if models.IsErrOrgNotExist(err) {
-			ctx.Error(422, "", err)
+			ctx.Error(http.StatusUnprocessableEntity, "", err)
 		} else {
-			ctx.Error(500, "GetOrgByName", err)
+			ctx.Error(http.StatusInternalServerError, "GetOrgByName", err)
 		}
 		return
 	}
 			ctx.ServerError("CanCreateOrgRepo", err)
 			return
 		} else if !canCreate {
-			ctx.Error(403, "", "Given user is not allowed to create repository in organization.")
+			ctx.Error(http.StatusForbidden, "", "Given user is not allowed to create repository in organization.")
 			return
 		}
 	}
 	// responses:
 	//   "201":
 	//     "$ref": "#/responses/Repository"
+	//   "403":
+	//     "$ref": "#/responses/forbidden"
+	//   "422":
+	//     "$ref": "#/responses/validationError"
+
 	ctxUser := ctx.User
 	// Not equal means context user is an organization,
 	// or is another user/organization if current user is admin.
 		org, err := models.GetUserByID(form.UID)
 		if err != nil {
 			if models.IsErrUserNotExist(err) {
-				ctx.Error(422, "", err)
+				ctx.Error(http.StatusUnprocessableEntity, "", err)
 			} else {
-				ctx.Error(500, "GetUserByID", err)
+				ctx.Error(http.StatusInternalServerError, "GetUserByID", err)
 			}
 			return
 		}
 	}
 
 	if ctx.HasError() {
-		ctx.Error(422, "", ctx.GetErrMsg())
+		ctx.Error(http.StatusUnprocessableEntity, "", ctx.GetErrMsg())
 		return
 	}
 
 	if !ctx.User.IsAdmin {
 		if !ctxUser.IsOrganization() && ctx.User.ID != ctxUser.ID {
-			ctx.Error(403, "", "Given user is not an organization.")
+			ctx.Error(http.StatusForbidden, "", "Given user is not an organization.")
 			return
 		}
 
 			// Check ownership of organization.
 			isOwner, err := ctxUser.IsOwnedBy(ctx.User.ID)
 			if err != nil {
-				ctx.Error(500, "IsOwnedBy", err)
+				ctx.Error(http.StatusInternalServerError, "IsOwnedBy", err)
 				return
 			} else if !isOwner {
-				ctx.Error(403, "", "Given user is not owner of organization.")
+				ctx.Error(http.StatusForbidden, "", "Given user is not owner of organization.")
 				return
 			}
 		}
 			addrErr := err.(models.ErrInvalidCloneAddr)
 			switch {
 			case addrErr.IsURLError:
-				ctx.Error(422, "", err)
+				ctx.Error(http.StatusUnprocessableEntity, "", err)
 			case addrErr.IsPermissionDenied:
-				ctx.Error(422, "", "You are not allowed to import local repositories.")
+				ctx.Error(http.StatusUnprocessableEntity, "", "You are not allowed to import local repositories.")
 			case addrErr.IsInvalidPath:
-				ctx.Error(422, "", "Invalid local path, it does not exist or not a directory.")
+				ctx.Error(http.StatusUnprocessableEntity, "", "Invalid local path, it does not exist or not a directory.")
 			default:
-				ctx.Error(500, "ParseRemoteAddr", "Unknown error type (ErrInvalidCloneAddr): "+err.Error())
+				ctx.Error(http.StatusInternalServerError, "ParseRemoteAddr", "Unknown error type (ErrInvalidCloneAddr): "+err.Error())
 			}
 		} else {
-			ctx.Error(500, "ParseRemoteAddr", err)
+			ctx.Error(http.StatusInternalServerError, "ParseRemoteAddr", err)
 		}
 		return
 	}
 	}
 
 	log.Trace("Repository migrated: %s/%s", ctxUser.Name, form.RepoName)
-	ctx.JSON(201, repo.APIFormat(models.AccessModeAdmin))
+	ctx.JSON(http.StatusCreated, repo.APIFormat(models.AccessModeAdmin))
 }
 
 func handleMigrateError(ctx *context.APIContext, repoOwner *models.User, remoteAddr string, err error) {
 	switch {
 	case models.IsErrRepoAlreadyExist(err):
-		ctx.Error(409, "", "The repository with the same name already exists.")
+		ctx.Error(http.StatusConflict, "", "The repository with the same name already exists.")
 	case migrations.IsRateLimitError(err):
-		ctx.Error(422, "", "Remote visit addressed rate limitation.")
+		ctx.Error(http.StatusUnprocessableEntity, "", "Remote visit addressed rate limitation.")
 	case migrations.IsTwoFactorAuthError(err):
-		ctx.Error(422, "", "Remote visit required two factors authentication.")
+		ctx.Error(http.StatusUnprocessableEntity, "", "Remote visit required two factors authentication.")
 	case models.IsErrReachLimitOfRepo(err):
-		ctx.Error(422, "", fmt.Sprintf("You have already reached your limit of %d repositories.", repoOwner.MaxCreationLimit()))
+		ctx.Error(http.StatusUnprocessableEntity, "", fmt.Sprintf("You have already reached your limit of %d repositories.", repoOwner.MaxCreationLimit()))
 	case models.IsErrNameReserved(err):
-		ctx.Error(422, "", fmt.Sprintf("The username '%s' is reserved.", err.(models.ErrNameReserved).Name))
+		ctx.Error(http.StatusUnprocessableEntity, "", fmt.Sprintf("The username '%s' is reserved.", err.(models.ErrNameReserved).Name))
 	case models.IsErrNamePatternNotAllowed(err):
-		ctx.Error(422, "", fmt.Sprintf("The pattern '%s' is not allowed in a username.", err.(models.ErrNamePatternNotAllowed).Pattern))
+		ctx.Error(http.StatusUnprocessableEntity, "", fmt.Sprintf("The pattern '%s' is not allowed in a username.", err.(models.ErrNamePatternNotAllowed).Pattern))
 	default:
 		err = util.URLSanitizedError(err, remoteAddr)
 		if strings.Contains(err.Error(), "Authentication failed") ||
 			strings.Contains(err.Error(), "Bad credentials") ||
 			strings.Contains(err.Error(), "could not read Username") {
-			ctx.Error(422, "", fmt.Sprintf("Authentication failed: %v.", err))
+			ctx.Error(http.StatusUnprocessableEntity, "", fmt.Sprintf("Authentication failed: %v.", err))
 		} else if strings.Contains(err.Error(), "fatal:") {
-			ctx.Error(422, "", fmt.Sprintf("Migration failed: %v.", err))
+			ctx.Error(http.StatusUnprocessableEntity, "", fmt.Sprintf("Migration failed: %v.", err))
 		} else {
-			ctx.Error(500, "MigrateRepository", err)
+			ctx.Error(http.StatusInternalServerError, "MigrateRepository", err)
 		}
 	}
 }
 	// responses:
 	//   "200":
 	//     "$ref": "#/responses/Repository"
-	ctx.JSON(200, ctx.Repo.Repository.APIFormat(ctx.Repo.AccessMode))
+
+	ctx.JSON(http.StatusOK, ctx.Repo.Repository.APIFormat(ctx.Repo.AccessMode))
 }
 
 // GetByID returns a single Repository
 	// responses:
 	//   "200":
 	//     "$ref": "#/responses/Repository"
+
 	repo, err := models.GetRepositoryByID(ctx.ParamsInt64(":id"))
 	if err != nil {
 		if models.IsErrRepoNotExist(err) {
 			ctx.NotFound()
 		} else {
-			ctx.Error(500, "GetRepositoryByID", err)
+			ctx.Error(http.StatusInternalServerError, "GetRepositoryByID", err)
 		}
 		return
 	}
 
 	perm, err := models.GetUserRepoPermission(repo, ctx.User)
 	if err != nil {
-		ctx.Error(500, "AccessLevel", err)
+		ctx.Error(http.StatusInternalServerError, "AccessLevel", err)
 		return
 	} else if !perm.HasAccess() {
 		ctx.NotFound()
 		return
 	}
-	ctx.JSON(200, repo.APIFormat(perm.AccessMode))
+	ctx.JSON(http.StatusOK, repo.APIFormat(perm.AccessMode))
 }
 
 // Edit edit repository properties
 	//     "$ref": "#/responses/forbidden"
 	//   "422":
 	//     "$ref": "#/responses/validationError"
+
 	if err := updateBasicProperties(ctx, opts); err != nil {
 		return
 	}
 	//     "$ref": "#/responses/empty"
 	//   "403":
 	//     "$ref": "#/responses/forbidden"
+
 	owner := ctx.Repo.Owner
 	repo := ctx.Repo.Repository
 
 	canDelete, err := repo.CanUserDelete(ctx.User)
 	if err != nil {
-		ctx.Error(500, "CanUserDelete", err)
+		ctx.Error(http.StatusInternalServerError, "CanUserDelete", err)
 		return
 	} else if !canDelete {
-		ctx.Error(403, "", "Given user is not owner of organization.")
+		ctx.Error(http.StatusForbidden, "", "Given user is not owner of organization.")
 		return
 	}
 
 	if err := repo_service.DeleteRepository(ctx.User, repo); err != nil {
-		ctx.Error(500, "DeleteRepository", err)
+		ctx.Error(http.StatusInternalServerError, "DeleteRepository", err)
 		return
 	}
 
 	log.Trace("Repository deleted: %s/%s", owner.Name, repo.Name)
-	ctx.Status(204)
+	ctx.Status(http.StatusNoContent)
 }
 
 // MirrorSync adds a mirrored repository to the sync queue
 	// responses:
 	//   "200":
 	//     "$ref": "#/responses/empty"
+	//   "403":
+	//     "$ref": "#/responses/forbidden"
+
 	repo := ctx.Repo.Repository
 
 	if !ctx.Repo.CanWrite(models.UnitTypeCode) {
-		ctx.Error(403, "MirrorSync", "Must have write access")
+		ctx.Error(http.StatusForbidden, "MirrorSync", "Must have write access")
 	}
 
 	mirror_service.StartToMirror(repo.ID)
 
-	ctx.Status(200)
+	ctx.Status(http.StatusOK)
 }

routers/api/v1/repo/star.go

 package repo
 
 import (
+	"net/http"
+
 	"code.gitea.io/gitea/modules/context"
 	"code.gitea.io/gitea/modules/convert"
 	api "code.gitea.io/gitea/modules/structs"
 	// responses:
 	//   "200":
 	//     "$ref": "#/responses/UserList"
+
 	stargazers, err := ctx.Repo.Repository.GetStargazers(-1)
 	if err != nil {
-		ctx.Error(500, "GetStargazers", err)
+		ctx.Error(http.StatusInternalServerError, "GetStargazers", err)
 		return
 	}
 	users := make([]*api.User, len(stargazers))
 	for i, stargazer := range stargazers {
 		users[i] = convert.ToUser(stargazer, ctx.IsSigned, ctx.User != nil && ctx.User.IsAdmin)
 	}
-	ctx.JSON(200, users)
+	ctx.JSON(http.StatusOK, users)
 }

routers/api/v1/repo/status.go

 
 import (
 	"fmt"
+	"net/http"
 
 	"code.gitea.io/gitea/models"
 	"code.gitea.io/gitea/modules/context"
 	// responses:
 	//   "201":
 	//     "$ref": "#/responses/Status"
+	//   "400":
+	//     "$ref": "#/responses/error"
+
 	sha := ctx.Params("sha")
 	if len(sha) == 0 {
-		ctx.Error(400, "sha not given", nil)
+		ctx.Error(http.StatusBadRequest, "sha not given", nil)
 		return
 	}
 	status := &models.CommitStatus{
 		Context:     form.Context,
 	}
 	if err := repofiles.CreateCommitStatus(ctx.Repo.Repository, ctx.User, sha, status); err != nil {
-		ctx.Error(500, "CreateCommitStatus", err)
+		ctx.Error(http.StatusInternalServerError, "CreateCommitStatus", err)
 		return
 	}
 
-	ctx.JSON(201, status.APIFormat())
+	ctx.JSON(http.StatusCreated, status.APIFormat())
 }
 
 // GetCommitStatuses returns all statuses for any given commit hash
 	// responses:
 	//   "200":
 	//     "$ref": "#/responses/StatusList"
+	//   "400":
+	//     "$ref": "#/responses/error"
+
 	getCommitStatuses(ctx, ctx.Params("sha"))
 }
 
 	// responses:
 	//   "200":
 	//     "$ref": "#/responses/StatusList"
+	//   "400":
+	//     "$ref": "#/responses/error"
 
 	filter := ctx.Params("ref")
 	if len(filter) == 0 {
-		ctx.Error(400, "ref not given", nil)
+		ctx.Error(http.StatusBadRequest, "ref not given", nil)
 		return
 	}
 
 	for _, reftype := range []string{"heads", "tags"} { //Search branches and tags
 		refSHA, lastMethodName, err := searchRefCommitByType(ctx, reftype, filter)
 		if err != nil {
-			ctx.Error(500, lastMethodName, err)
+			ctx.Error(http.StatusInternalServerError, lastMethodName, err)
 			return
 		}
 		if refSHA != "" {
 
 func getCommitStatuses(ctx *context.APIContext, sha string) {
 	if len(sha) == 0 {
-		ctx.Error(400, "ref/sha not given", nil)
+		ctx.Error(http.StatusBadRequest, "ref/sha not given", nil)
 		return
 	}
 	repo := ctx.Repo.Repository
 		State:    ctx.QueryTrim("state"),
 	})
 	if err != nil {
-		ctx.Error(500, "GetCommitStatuses", fmt.Errorf("GetCommitStatuses[%s, %s, %d]: %v", repo.FullName(), sha, ctx.QueryInt("page"), err))
+		ctx.Error(http.StatusInternalServerError, "GetCommitStatuses", fmt.Errorf("GetCommitStatuses[%s, %s, %d]: %v", repo.FullName(), sha, ctx.QueryInt("page"), err))
 		return
 	}
 
 		apiStatuses = append(apiStatuses, status.APIFormat())
 	}
 
-	ctx.JSON(200, apiStatuses)
+	ctx.JSON(http.StatusOK, apiStatuses)
 }
 
 type combinedCommitStatus struct {
 	// responses:
 	//   "200":
 	//     "$ref": "#/responses/Status"
+	//   "400":
+	//     "$ref": "#/responses/error"
+
 	sha := ctx.Params("ref")
 	if len(sha) == 0 {
-		ctx.Error(400, "ref/sha not given", nil)
+		ctx.Error(http.StatusBadRequest, "ref/sha not given", nil)
 		return
 	}
 	repo := ctx.Repo.Repository
 
 	statuses, err := models.GetLatestCommitStatus(repo, sha, page)
 	if err != nil {
-		ctx.Error(500, "GetLatestCommitStatus", fmt.Errorf("GetLatestCommitStatus[%s, %s, %d]: %v", repo.FullName(), sha, page, err))
+		ctx.Error(http.StatusInternalServerError, "GetLatestCommitStatus", fmt.Errorf("GetLatestCommitStatus[%s, %s, %d]: %v", repo.FullName(), sha, page, err))
 		return
 	}
 
 	if len(statuses) == 0 {
-		ctx.Status(200)
+		ctx.Status(http.StatusOK)
 		return
 	}
 
 		}
 	}
 
-	ctx.JSON(200, retStatus)
+	ctx.JSON(http.StatusOK, retStatus)
 }

routers/api/v1/repo/subscriber.go

 package repo
 
 import (
+	"net/http"
+
 	"code.gitea.io/gitea/modules/context"
 	"code.gitea.io/gitea/modules/convert"
 	api "code.gitea.io/gitea/modules/structs"
 	// responses:
 	//   "200":
 	//     "$ref": "#/responses/UserList"
+
 	subscribers, err := ctx.Repo.Repository.GetWatchers(0)
 	if err != nil {
-		ctx.Error(500, "GetWatchers", err)
+		ctx.Error(http.StatusInternalServerError, "GetWatchers", err)
 		return
 	}
 	users := make([]*api.User, len(subscribers))
 	for i, subscriber := range subscribers {
 		users[i] = convert.ToUser(subscriber, ctx.IsSigned, ctx.User != nil && ctx.User.IsAdmin)
 	}
-	ctx.JSON(200, users)
+	ctx.JSON(http.StatusOK, users)
 }

routers/api/v1/repo/tag.go

 	// responses:
 	//   "200":
 	//     "$ref": "#/responses/TagList"
+
 	tags, err := ctx.Repo.GitRepo.GetTagInfos()
 	if err != nil {
-		ctx.Error(500, "GetTags", err)
+		ctx.Error(http.StatusInternalServerError, "GetTags", err)
 		return
 	}
 
 		apiTags[i] = convert.ToTag(ctx.Repo.Repository, tags[i])
 	}
 
-	ctx.JSON(200, &apiTags)
+	ctx.JSON(http.StatusOK, &apiTags)
 }
 
 // GetTag get the tag of a repository.
 	// responses:
 	//   "200":
 	//     "$ref": "#/responses/AnnotatedTag"
+	//   "400":
+	//     "$ref": "#/responses/error"
 
 	sha := ctx.Params("sha")
 	if len(sha) == 0 {

routers/api/v1/repo/topic.go

 	})
 	if err != nil {
 		log.Error("ListTopics failed: %v", err)
-		ctx.JSON(http.StatusInternalServerError, map[string]interface{}{
-			"message": "ListTopics failed.",
-		})
+		ctx.InternalServerError(err)
 		return
 	}
 
 	// responses:
 	//   "204":
 	//     "$ref": "#/responses/empty"
+	//   "422":
+	//     "$ref": "#/responses/invalidTopicsError"
 
 	topicNames := form.Topics
 	validTopics, invalidTopics := models.SanitizeAndValidateTopics(topicNames)
 	err := models.SaveTopics(ctx.Repo.Repository.ID, validTopics...)
 	if err != nil {
 		log.Error("SaveTopics failed: %v", err)
-		ctx.JSON(http.StatusInternalServerError, map[string]interface{}{
-			"message": "Save topics failed.",
-		})
+		ctx.InternalServerError(err)
 		return
 	}
 
 	// responses:
 	//   "204":
 	//     "$ref": "#/responses/empty"
+	//   "422":
+	//     "$ref": "#/responses/invalidTopicsError"
 
 	topicName := strings.TrimSpace(strings.ToLower(ctx.Params(":topic")))
 
 	if !models.ValidateTopic(topicName) {
-		ctx.Error(http.StatusUnprocessableEntity, "", "Topic name is invalid")
+		ctx.JSON(http.StatusUnprocessableEntity, map[string]interface{}{
+			"invalidTopics": topicName,
+			"message":       "Topic name is invalid",
+		})
 		return
 	}
 
 	})
 	if err != nil {
 		log.Error("AddTopic failed: %v", err)
-		ctx.JSON(http.StatusInternalServerError, map[string]interface{}{
-			"message": "ListTopics failed.",
-		})
+		ctx.InternalServerError(err)
 		return
 	}
 	if len(topics) >= 25 {
 	_, err = models.AddTopic(ctx.Repo.Repository.ID, topicName)
 	if err != nil {
 		log.Error("AddTopic failed: %v", err)
-		ctx.JSON(http.StatusInternalServerError, map[string]interface{}{
-			"message": "AddTopic failed.",
-		})
+		ctx.InternalServerError(err)
 		return
 	}
 
 	// responses:
 	//   "204":
 	//     "$ref": "#/responses/empty"
+	//   "422":
+	//     "$ref": "#/responses/invalidTopicsError"
+
 	topicName := strings.TrimSpace(strings.ToLower(ctx.Params(":topic")))
 
 	if !models.ValidateTopic(topicName) {
-		ctx.Error(http.StatusUnprocessableEntity, "", "Topic name is invalid")
+		ctx.JSON(http.StatusUnprocessableEntity, map[string]interface{}{
+			"invalidTopics": topicName,
+			"message":       "Topic name is invalid",
+		})
 		return
 	}
 
 	topic, err := models.DeleteTopic(ctx.Repo.Repository.ID, topicName)
 	if err != nil {
 		log.Error("DeleteTopic failed: %v", err)
-		ctx.JSON(http.StatusInternalServerError, map[string]interface{}{
-			"message": "DeleteTopic failed.",
-		})
+		ctx.InternalServerError(err)
 		return
 	}
 
 	// responses:
 	//   "200":
 	//     "$ref": "#/responses/TopicListResponse"
+	//   "403":
+	//     "$ref": "#/responses/forbidden"
+
 	if ctx.User == nil {
-		ctx.JSON(http.StatusForbidden, map[string]interface{}{
-			"message": "Only owners could change the topics.",
-		})
+		ctx.Error(http.StatusForbidden, "UserIsNil", "Only owners could change the topics.")
 		return
 	}
 
 	})
 	if err != nil {
 		log.Error("SearchTopics failed: %v", err)
-		ctx.JSON(http.StatusInternalServerError, map[string]interface{}{
-			"message": "Search topics failed.",
-		})
+		ctx.InternalServerError(err)
 		return
 	}
 

routers/api/v1/repo/tree.go

 package repo
 
 import (
+	"net/http"
+
 	"code.gitea.io/gitea/modules/context"
 	"code.gitea.io/gitea/modules/repofiles"
 )
 	// responses:
 	//   "200":
 	//     "$ref": "#/responses/GitTreeResponse"
+	//   "400":
+	//     "$ref": "#/responses/error"
 
 	sha := ctx.Params(":sha")
 	if len(sha) == 0 {
-		ctx.Error(400, "", "sha not provided")
+		ctx.Error(http.StatusBadRequest, "", "sha not provided")
 		return
 	}
 	if tree, err := repofiles.GetTreeBySHA(ctx.Repo.Repository, sha, ctx.QueryInt("page"), ctx.QueryInt("per_page"), ctx.QueryBool("recursive")); err != nil {
-		ctx.Error(400, "", err.Error())
+		ctx.Error(http.StatusBadRequest, "", err.Error())
 	} else {
-		ctx.JSON(200, tree)
+		ctx.JSON(http.StatusOK, tree)
 	}
 }

routers/api/v1/user/app.go

 package user
 
 import (
+	"net/http"
+
 	"code.gitea.io/gitea/models"
 	"code.gitea.io/gitea/modules/context"
 	api "code.gitea.io/gitea/modules/structs"
 	// responses:
 	//   "200":
 	//     "$ref": "#/responses/AccessTokenList"
+
 	tokens, err := models.ListAccessTokens(ctx.User.ID)
 	if err != nil {
-		ctx.Error(500, "ListAccessTokens", err)
+		ctx.Error(http.StatusInternalServerError, "ListAccessTokens", err)
 		return
 	}
 
 			TokenLastEight: tokens[i].TokenLastEight,
 		}
 	}
-	ctx.JSON(200, &apiTokens)
+	ctx.JSON(http.StatusOK, &apiTokens)
 }
 
 // CreateAccessToken create access tokens
 	// responses:
 	//   "200":
 	//     "$ref": "#/responses/AccessToken"
+
 	t := &models.AccessToken{
 		UID:  ctx.User.ID,
 		Name: form.Name,
 	}
 	if err := models.NewAccessToken(t); err != nil {
-		ctx.Error(500, "NewAccessToken", err)
+		ctx.Error(http.StatusInternalServerError, "NewAccessToken", err)
 		return
 	}
-	ctx.JSON(201, &api.AccessToken{
+	ctx.JSON(http.StatusCreated, &api.AccessToken{
 		Name:           t.Name,
 		Token:          t.Token,
 		ID:             t.ID,
 	// responses:
 	//   "204":
 	//     "$ref": "#/responses/empty"
+
 	tokenID := ctx.ParamsInt64(":id")
 	if err := models.DeleteAccessTokenByID(tokenID, ctx.User.ID); err != nil {
 		if models.IsErrAccessTokenNotExist(err) {
 			ctx.NotFound()
 		} else {
-			ctx.Error(500, "DeleteAccessTokenByID", err)
+			ctx.Error(http.StatusInternalServerError, "DeleteAccessTokenByID", err)
 		}
 		return
 	}
 
-	ctx.Status(204)
+	ctx.Status(http.StatusNoContent)
 }

routers/api/v1/user/email.go

 package user
 
 import (
+	"net/http"
+
 	"code.gitea.io/gitea/models"
 	"code.gitea.io/gitea/modules/context"
 	"code.gitea.io/gitea/modules/convert"
 	// responses:
 	//   "200":
 	//     "$ref": "#/responses/EmailList"
+
 	emails, err := models.GetEmailAddresses(ctx.User.ID)
 	if err != nil {
-		ctx.Error(500, "GetEmailAddresses", err)
+		ctx.Error(http.StatusInternalServerError, "GetEmailAddresses", err)
 		return
 	}
 	apiEmails := make([]*api.Email, len(emails))
 	for i := range emails {
 		apiEmails[i] = convert.ToEmail(emails[i])
 	}
-	ctx.JSON(200, &apiEmails)
+	ctx.JSON(http.StatusOK, &apiEmails)
 }
 
 // AddEmail add an email address
 	// responses:
 	//   '201':
 	//     "$ref": "#/responses/EmailList"
+	//   "422":
+	//     "$ref": "#/responses/validationError"
+
 	if len(form.Emails) == 0 {
-		ctx.Status(422)
+		ctx.Error(http.StatusUnprocessableEntity, "", "Email list empty")
 		return
 	}
 
 
 	if err := models.AddEmailAddresses(emails); err != nil {
 		if models.IsErrEmailAlreadyUsed(err) {
-			ctx.Error(422, "", "Email address has been used: "+err.(models.ErrEmailAlreadyUsed).Email)
+			ctx.Error(http.StatusUnprocessableEntity, "", "Email address has been used: "+err.(models.ErrEmailAlreadyUsed).Email)
 		} else {
-			ctx.Error(500, "AddEmailAddresses", err)
+			ctx.Error(http.StatusInternalServerError, "AddEmailAddresses", err)
 		}
 		return
 	}
 	for i := range emails {
 		apiEmails[i] = convert.ToEmail(emails[i])
 	}
-	ctx.JSON(201, &apiEmails)
+	ctx.JSON(http.StatusCreated, &apiEmails)
 }
 
 // DeleteEmail delete email
 	// responses:
 	//   "204":
 	//     "$ref": "#/responses/empty"
+
 	if len(form.Emails) == 0 {
-		ctx.Status(204)
+		ctx.Status(http.StatusNoContent)
 		return
 	}
 
 	}
 
 	if err := models.DeleteEmailAddresses(emails); err != nil {
-		ctx.Error(500, "DeleteEmailAddresses", err)
+		ctx.Error(http.StatusInternalServerError, "DeleteEmailAddresses", err)
 		return
 	}
-	ctx.Status(204)
+	ctx.Status(http.StatusNoContent)
 }

routers/api/v1/user/follower.go

 package user
 
 import (
+	"net/http"
+
 	"code.gitea.io/gitea/models"
 	"code.gitea.io/gitea/modules/context"
 	"code.gitea.io/gitea/modules/convert"
 	for i := range users {
 		apiUsers[i] = convert.ToUser(users[i], ctx.IsSigned, ctx.User != nil && ctx.User.IsAdmin)
 	}
-	ctx.JSON(200, &apiUsers)
+	ctx.JSON(http.StatusOK, &apiUsers)
 }
 
 func listUserFollowers(ctx *context.APIContext, u *models.User) {
 	users, err := u.GetFollowers(ctx.QueryInt("page"))
 	if err != nil {
-		ctx.Error(500, "GetUserFollowers", err)
+		ctx.Error(http.StatusInternalServerError, "GetUserFollowers", err)
 		return
 	}
 	responseAPIUsers(ctx, users)
 	// responses:
 	//   "200":
 	//     "$ref": "#/responses/UserList"
+
 	listUserFollowers(ctx, ctx.User)
 }
 
 	// responses:
 	//   "200":
 	//     "$ref": "#/responses/UserList"
+
 	u := GetUserByParams(ctx)
 	if ctx.Written() {
 		return
 func listUserFollowing(ctx *context.APIContext, u *models.User) {
 	users, err := u.GetFollowing(ctx.QueryInt("page"))
 	if err != nil {
-		ctx.Error(500, "GetFollowing", err)
+		ctx.Error(http.StatusInternalServerError, "GetFollowing", err)
 		return
 	}
 	responseAPIUsers(ctx, users)
 	// responses:
 	//   "200":
 	//     "$ref": "#/responses/UserList"
+
 	listUserFollowing(ctx, ctx.User)
 }
 
 	// responses:
 	//   "200":
 	//     "$ref": "#/responses/UserList"
+
 	u := GetUserByParams(ctx)
 	if ctx.Written() {
 		return
 
 func checkUserFollowing(ctx *context.APIContext, u *models.User, followID int64) {
 	if u.IsFollowing(followID) {
-		ctx.Status(204)
+		ctx.Status(http.StatusNoContent)
 	} else {
 		ctx.NotFound()
 	}
 	//     "$ref": "#/responses/empty"
 	//   "404":
 	//     "$ref": "#/responses/notFound"
+
 	target := GetUserByParams(ctx)
 	if ctx.Written() {
 		return
 	//     "$ref": "#/responses/empty"
 	//   "404":
 	//     "$ref": "#/responses/notFound"
+
 	u := GetUserByParams(ctx)
 	if ctx.Written() {
 		return
 	// responses:
 	//   "204":
 	//     "$ref": "#/responses/empty"
+
 	target := GetUserByParams(ctx)
 	if ctx.Written() {
 		return
 	}
 	if err := models.FollowUser(ctx.User.ID, target.ID); err != nil {
-		ctx.Error(500, "FollowUser", err)
+		ctx.Error(http.StatusInternalServerError, "FollowUser", err)
 		return
 	}
-	ctx.Status(204)
+	ctx.Status(http.StatusNoContent)
 }
 
 // Unfollow unfollow a user
 	// responses:
 	//   "204":
 	//     "$ref": "#/responses/empty"
+
 	target := GetUserByParams(ctx)
 	if ctx.Written() {
 		return
 	}
 	if err := models.UnfollowUser(ctx.User.ID, target.ID); err != nil {
-		ctx.Error(500, "UnfollowUser", err)
+		ctx.Error(http.StatusInternalServerError, "UnfollowUser", err)
 		return
 	}
-	ctx.Status(204)
+	ctx.Status(http.StatusNoContent)
 }

routers/api/v1/user/gpg_key.go

 package user
 
 import (
+	"net/http"
+
 	"code.gitea.io/gitea/models"
 	"code.gitea.io/gitea/modules/context"
 	"code.gitea.io/gitea/modules/convert"
 func listGPGKeys(ctx *context.APIContext, uid int64) {
 	keys, err := models.ListGPGKeys(uid)
 	if err != nil {
-		ctx.Error(500, "ListGPGKeys", err)
+		ctx.Error(http.StatusInternalServerError, "ListGPGKeys", err)
 		return
 	}
 
 		apiKeys[i] = convert.ToGPGKey(keys[i])
 	}
 
-	ctx.JSON(200, &apiKeys)
+	ctx.JSON(http.StatusOK, &apiKeys)
 }
 
 //ListGPGKeys get the GPG key list of a user
 	// responses:
 	//   "200":
 	//     "$ref": "#/responses/GPGKeyList"
+
 	user := GetUserByParams(ctx)
 	if ctx.Written() {
 		return
 	// responses:
 	//   "200":
 	//     "$ref": "#/responses/GPGKeyList"
+
 	listGPGKeys(ctx, ctx.User.ID)
 }
 
 	//     "$ref": "#/responses/GPGKey"
 	//   "404":
 	//     "$ref": "#/responses/notFound"
+
 	key, err := models.GetGPGKeyByID(ctx.ParamsInt64(":id"))
 	if err != nil {
 		if models.IsErrGPGKeyNotExist(err) {
 			ctx.NotFound()
 		} else {
-			ctx.Error(500, "GetGPGKeyByID", err)
+			ctx.Error(http.StatusInternalServerError, "GetGPGKeyByID", err)
 		}
 		return
 	}
-	ctx.JSON(200, convert.ToGPGKey(key))
+	ctx.JSON(http.StatusOK, convert.ToGPGKey(key))
 }
 
 // CreateUserGPGKey creates new GPG key to given user by ID.
 		HandleAddGPGKeyError(ctx, err)
 		return
 	}
-	ctx.JSON(201, convert.ToGPGKey(key))
+	ctx.JSON(http.StatusCreated, convert.ToGPGKey(key))
 }
 
 // swagger:parameters userCurrentPostGPGKey
 	//     "$ref": "#/responses/GPGKey"
 	//   "422":
 	//     "$ref": "#/responses/validationError"
+
 	CreateUserGPGKey(ctx, form, ctx.User.ID)
 }
 
 	//     "$ref": "#/responses/empty"
 	//   "403":
 	//     "$ref": "#/responses/forbidden"
+
 	if err := models.DeleteGPGKey(ctx.User, ctx.ParamsInt64(":id")); err != nil {
 		if models.IsErrGPGKeyAccessDenied(err) {
-			ctx.Error(403, "", "You do not have access to this key")
+			ctx.Error(http.StatusForbidden, "", "You do not have access to this key")
 		} else {
-			ctx.Error(500, "DeleteGPGKey", err)
+			ctx.Error(http.StatusInternalServerError, "DeleteGPGKey", err)
 		}
 		return
 	}
 
-	ctx.Status(204)
+	ctx.Status(http.StatusNoContent)
 }
 
 // HandleAddGPGKeyError handle add GPGKey error
 func HandleAddGPGKeyError(ctx *context.APIContext, err error) {
 	switch {
 	case models.IsErrGPGKeyAccessDenied(err):
-		ctx.Error(422, "", "You do not have access to this GPG key")
+		ctx.Error(http.StatusUnprocessableEntity, "", "You do not have access to this GPG key")
 	case models.IsErrGPGKeyIDAlreadyUsed(err):
-		ctx.Error(422, "", "A key with the same id already exists")
+		ctx.Error(http.StatusUnprocessableEntity, "", "A key with the same id already exists")
 	default:
-		ctx.Error(500, "AddGPGKey", err)
+		ctx.Error(http.StatusInternalServerError, "AddGPGKey", err)
 	}
 }

routers/api/v1/user/key.go

 package user
 
 import (
+	"net/http"
+
 	"code.gitea.io/gitea/models"
 	"code.gitea.io/gitea/modules/context"
 	"code.gitea.io/gitea/modules/convert"
 		if models.IsErrUserNotExist(err) {
 			ctx.NotFound()
 		} else {
-			ctx.Error(500, "GetUserByName", err)
+			ctx.Error(http.StatusInternalServerError, "GetUserByName", err)
 		}
 		return nil
 	}
 	}
 
 	if err != nil {
-		ctx.Error(500, "ListPublicKeys", err)
+		ctx.Error(http.StatusInternalServerError, "ListPublicKeys", err)
 		return
 	}
 
 		}
 	}
 
-	ctx.JSON(200, &apiKeys)
+	ctx.JSON(http.StatusOK, &apiKeys)
 }
 
 // ListMyPublicKeys list all of the authenticated user's public keys
 	// responses:
 	//   "200":
 	//     "$ref": "#/responses/PublicKeyList"
+
 	listPublicKeys(ctx, ctx.User)
 }
 
 	// responses:
 	//   "200":
 	//     "$ref": "#/responses/PublicKeyList"
+
 	user := GetUserByParams(ctx)
 	if ctx.Written() {
 		return
 	//     "$ref": "#/responses/PublicKey"
 	//   "404":
 	//     "$ref": "#/responses/notFound"
+
 	key, err := models.GetPublicKeyByID(ctx.ParamsInt64(":id"))
 	if err != nil {
 		if models.IsErrKeyNotExist(err) {
 			ctx.NotFound()
 		} else {
-			ctx.Error(500, "GetPublicKeyByID", err)
+			ctx.Error(http.StatusInternalServerError, "GetPublicKeyByID", err)
 		}
 		return
 	}
 	if ctx.User.IsAdmin || ctx.User.ID == key.OwnerID {
 		apiKey, _ = appendPrivateInformation(apiKey, key, ctx.User)
 	}
-	ctx.JSON(200, apiKey)
+	ctx.JSON(http.StatusOK, apiKey)
 }
 
 // CreateUserPublicKey creates new public key to given user by ID.
 	if ctx.User.IsAdmin || ctx.User.ID == key.OwnerID {
 		apiKey, _ = appendPrivateInformation(apiKey, key, ctx.User)
 	}
-	ctx.JSON(201, apiKey)
+	ctx.JSON(http.StatusCreated, apiKey)
 }
 
 // CreatePublicKey create one public key for me
 	//     "$ref": "#/responses/PublicKey"
 	//   "422":
 	//     "$ref": "#/responses/validationError"
+
 	CreateUserPublicKey(ctx, form, ctx.User.ID)
 }
 
 	//     "$ref": "#/responses/forbidden"
 	//   "404":
 	//     "$ref": "#/responses/notFound"
+
 	if err := models.DeletePublicKey(ctx.User, ctx.ParamsInt64(":id")); err != nil {
 		if models.IsErrKeyNotExist(err) {
 			ctx.NotFound()
 		} else if models.IsErrKeyAccessDenied(err) {
-			ctx.Error(403, "", "You do not have access to this key")
+			ctx.Error(http.StatusForbidden, "", "You do not have access to this key")
 		} else {
-			ctx.Error(500, "DeletePublicKey", err)
+			ctx.Error(http.StatusInternalServerError, "DeletePublicKey", err)
 		}
 		return
 	}
 
-	ctx.Status(204)
+	ctx.Status(http.StatusNoContent)
 }

routers/api/v1/user/repo.go

 package user
 
 import (
+	"net/http"
+
 	"code.gitea.io/gitea/models"
 	"code.gitea.io/gitea/modules/context"
 	api "code.gitea.io/gitea/modules/structs"
 func listUserRepos(ctx *context.APIContext, u *models.User, private bool) {
 	repos, err := models.GetUserRepositories(u.ID, private, 1, u.NumRepos, "")
 	if err != nil {
-		ctx.Error(500, "GetUserRepositories", err)
+		ctx.Error(http.StatusInternalServerError, "GetUserRepositories", err)
 		return
 	}
 
 	for i := range repos {
 		access, err := models.AccessLevel(ctx.User, repos[i])
 		if err != nil {
-			ctx.Error(500, "AccessLevel", err)
+			ctx.Error(http.StatusInternalServerError, "AccessLevel", err)
 			return
 		}
 		if ctx.IsSigned && ctx.User.IsAdmin || access >= models.AccessModeRead {
 			apiRepos = append(apiRepos, repos[i].APIFormat(access))
 		}
 	}
-	ctx.JSON(200, &apiRepos)
+	ctx.JSON(http.StatusOK, &apiRepos)
 }
 
 // ListUserRepos - list the repos owned by the given user.
 	// responses:
 	//   "200":
 	//     "$ref": "#/responses/RepositoryList"
+
 	user := GetUserByParams(ctx)
 	if ctx.Written() {
 		return
 	// responses:
 	//   "200":
 	//     "$ref": "#/responses/RepositoryList"
+
 	ownRepos, err := models.GetUserRepositories(ctx.User.ID, true, 1, ctx.User.NumRepos, "")
 	if err != nil {
-		ctx.Error(500, "GetUserRepositories", err)
+		ctx.Error(http.StatusInternalServerError, "GetUserRepositories", err)
 		return
 	}
 	accessibleReposMap, err := ctx.User.GetRepositoryAccesses()
 	if err != nil {
-		ctx.Error(500, "GetRepositoryAccesses", err)
+		ctx.Error(http.StatusInternalServerError, "GetRepositoryAccesses", err)
 		return
 	}
 
 		apiRepos[i] = repo.APIFormat(access)
 		i++
 	}
-	ctx.JSON(200, &apiRepos)
+	ctx.JSON(http.StatusOK, &apiRepos)
 }
 
 // ListOrgRepos - list the repositories of an organization.
 	// responses:
 	//   "200":
 	//     "$ref": "#/responses/RepositoryList"
+
 	listUserRepos(ctx, ctx.Org.Organization, ctx.IsSigned)
 }

routers/api/v1/user/star.go

 package user
 
 import (
+	"net/http"
+
 	"code.gitea.io/gitea/models"
 	"code.gitea.io/gitea/modules/context"
 	api "code.gitea.io/gitea/modules/structs"
 	// responses:
 	//   "200":
 	//     "$ref": "#/responses/RepositoryList"
+
 	user := GetUserByParams(ctx)
 	private := user.ID == ctx.User.ID
 	repos, err := getStarredRepos(user, private)
 	if err != nil {
-		ctx.Error(500, "getStarredRepos", err)
+		ctx.Error(http.StatusInternalServerError, "getStarredRepos", err)
 	}
-	ctx.JSON(200, &repos)
+	ctx.JSON(http.StatusOK, &repos)
 }
 
 // GetMyStarredRepos returns the repos that the authenticated user has starred
 	// responses:
 	//   "200":
 	//     "$ref": "#/responses/RepositoryList"
+
 	repos, err := getStarredRepos(ctx.User, true)
 	if err != nil {
-		ctx.Error(500, "getStarredRepos", err)
+		ctx.Error(http.StatusInternalServerError, "getStarredRepos", err)
 	}
-	ctx.JSON(200, &repos)
+	ctx.JSON(http.StatusOK, &repos)
 }
 
 // IsStarring returns whether the authenticated is starring the repo
 	//     "$ref": "#/responses/empty"
 	//   "404":
 	//     "$ref": "#/responses/notFound"
+
 	if models.IsStaring(ctx.User.ID, ctx.Repo.Repository.ID) {
-		ctx.Status(204)
+		ctx.Status(http.StatusNoContent)
 	} else {
 		ctx.NotFound()
 	}
 	// responses:
 	//   "204":
 	//     "$ref": "#/responses/empty"
+
 	err := models.StarRepo(ctx.User.ID, ctx.Repo.Repository.ID, true)
 	if err != nil {
-		ctx.Error(500, "StarRepo", err)
+		ctx.Error(http.StatusInternalServerError, "StarRepo", err)
 		return
 	}
-	ctx.Status(204)
+	ctx.Status(http.StatusNoContent)
 }
 
 // Unstar the repo specified in the APIContext, as the authenticated user
 	// responses:
 	//   "204":
 	//     "$ref": "#/responses/empty"
+
 	err := models.StarRepo(ctx.User.ID, ctx.Repo.Repository.ID, false)
 	if err != nil {
-		ctx.Error(500, "StarRepo", err)
+		ctx.Error(http.StatusInternalServerError, "StarRepo", err)
 		return
 	}
-	ctx.Status(204)
+	ctx.Status(http.StatusNoContent)
 }

routers/api/v1/user/user.go

 	//           type: array
 	//           items:
 	//             "$ref": "#/definitions/User"
+
 	opts := &models.SearchUserOptions{
 		Keyword:  strings.Trim(ctx.Query("q"), " "),
 		UID:      com.StrTo(ctx.Query("uid")).MustInt64(),
 
 	users, _, err := models.SearchUsers(opts)
 	if err != nil {
-		ctx.JSON(500, map[string]interface{}{
+		ctx.JSON(http.StatusInternalServerError, map[string]interface{}{
 			"ok":    false,
 			"error": err.Error(),
 		})
 		results[i] = convert.ToUser(users[i], ctx.IsSigned, ctx.User != nil && ctx.User.IsAdmin)
 	}
 
-	ctx.JSON(200, map[string]interface{}{
+	ctx.JSON(http.StatusOK, map[string]interface{}{
 		"ok":   true,
 		"data": results,
 	})
 	//     "$ref": "#/responses/User"
 	//   "404":
 	//     "$ref": "#/responses/notFound"
+
 	u, err := models.GetUserByName(ctx.Params(":username"))
 	if err != nil {
 		if models.IsErrUserNotExist(err) {
 			ctx.NotFound()
 		} else {
-			ctx.Error(500, "GetUserByName", err)
+			ctx.Error(http.StatusInternalServerError, "GetUserByName", err)
 		}
 		return
 	}
 
-	ctx.JSON(200, convert.ToUser(u, ctx.IsSigned, ctx.User != nil && (ctx.User.ID == u.ID || ctx.User.IsAdmin)))
+	ctx.JSON(http.StatusOK, convert.ToUser(u, ctx.IsSigned, ctx.User != nil && (ctx.User.ID == u.ID || ctx.User.IsAdmin)))
 }
 
 // GetAuthenticatedUser get current user's information
 	// responses:
 	//   "200":
 	//     "$ref": "#/responses/User"
-	ctx.JSON(200, convert.ToUser(ctx.User, ctx.IsSigned, ctx.User != nil))
+
+	ctx.JSON(http.StatusOK, convert.ToUser(ctx.User, ctx.IsSigned, ctx.User != nil))
 }
 
 // GetUserHeatmapData is the handler to get a users heatmap
 		ctx.Error(http.StatusInternalServerError, "GetUserHeatmapDataByUser", err)
 		return
 	}
-	ctx.JSON(200, heatmap)
+	ctx.JSON(http.StatusOK, heatmap)
 }

routers/api/v1/user/watch.go

 package user
 
 import (
+	"net/http"
+
 	"code.gitea.io/gitea/models"
 	"code.gitea.io/gitea/modules/context"
 	"code.gitea.io/gitea/modules/setting"
 	// responses:
 	//   "200":
 	//     "$ref": "#/responses/RepositoryList"
+
 	user := GetUserByParams(ctx)
 	private := user.ID == ctx.User.ID
 	repos, err := getWatchedRepos(user, private)
 	if err != nil {
-		ctx.Error(500, "getWatchedRepos", err)
+		ctx.Error(http.StatusInternalServerError, "getWatchedRepos", err)
 	}
-	ctx.JSON(200, &repos)
+	ctx.JSON(http.StatusOK, &repos)
 }
 
 // GetMyWatchedRepos returns the repos that the authenticated user is watching
 	// responses:
 	//   "200":
 	//     "$ref": "#/responses/RepositoryList"
+
 	repos, err := getWatchedRepos(ctx.User, true)
 	if err != nil {
-		ctx.Error(500, "getWatchedRepos", err)
+		ctx.Error(http.StatusInternalServerError, "getWatchedRepos", err)
 	}
-	ctx.JSON(200, &repos)
+	ctx.JSON(http.StatusOK, &repos)
 }
 
 // IsWatching returns whether the authenticated user is watching the repo
 	// responses:
 	//   "200":
 	//     "$ref": "#/responses/WatchInfo"
+
 	if models.IsWatching(ctx.User.ID, ctx.Repo.Repository.ID) {
-		ctx.JSON(200, api.WatchInfo{
+		ctx.JSON(http.StatusOK, api.WatchInfo{
 			Subscribed:    true,
 			Ignored:       false,
 			Reason:        nil,
 	// responses:
 	//   "200":
 	//     "$ref": "#/responses/WatchInfo"
+
 	err := models.WatchRepo(ctx.User.ID, ctx.Repo.Repository.ID, true)
 	if err != nil {
-		ctx.Error(500, "WatchRepo", err)
+		ctx.Error(http.StatusInternalServerError, "WatchRepo", err)
 		return
 	}
-	ctx.JSON(200, api.WatchInfo{
+	ctx.JSON(http.StatusOK, api.WatchInfo{
 		Subscribed:    true,
 		Ignored:       false,
 		Reason:        nil,
 	// responses:
 	//   "204":
 	//     "$ref": "#/responses/empty"
+
 	err := models.WatchRepo(ctx.User.ID, ctx.Repo.Repository.ID, false)
 	if err != nil {
-		ctx.Error(500, "UnwatchRepo", err)
+		ctx.Error(http.StatusInternalServerError, "UnwatchRepo", err)
 		return
 	}
-	ctx.Status(204)
+	ctx.Status(http.StatusNoContent)
 }
 
 // subscriptionURL returns the URL of the subscription API endpoint of a repo

routers/api/v1/utils/hook.go

 		if models.IsErrWebhookNotExist(err) {
 			ctx.NotFound()
 		} else {
-			ctx.Error(500, "GetWebhookByOrgID", err)
+			ctx.Error(http.StatusInternalServerError, "GetWebhookByOrgID", err)
 		}
 		return nil, err
 	}
 		if models.IsErrWebhookNotExist(err) {
 			ctx.NotFound()
 		} else {
-			ctx.Error(500, "GetWebhookByID", err)
+			ctx.Error(http.StatusInternalServerError, "GetWebhookByID", err)
 		}
 		return nil, err
 	}
 // write the appropriate error to `ctx`. Return whether the form is valid
 func CheckCreateHookOption(ctx *context.APIContext, form *api.CreateHookOption) bool {
 	if !models.IsValidHookTaskType(form.Type) {
-		ctx.Error(422, "", "Invalid hook type")
+		ctx.Error(http.StatusUnprocessableEntity, "", "Invalid hook type")
 		return false
 	}
 	for _, name := range []string{"url", "content_type"} {
 		if _, ok := form.Config[name]; !ok {
-			ctx.Error(422, "", "Missing config option: "+name)
+			ctx.Error(http.StatusUnprocessableEntity, "", "Missing config option: "+name)
 			return false
 		}
 	}
 	if !models.IsValidHookContentType(form.Config["content_type"]) {
-		ctx.Error(422, "", "Invalid content type")
+		ctx.Error(http.StatusUnprocessableEntity, "", "Invalid content type")
 		return false
 	}
 	return true
 	if w.HookTaskType == models.SLACK {
 		channel, ok := form.Config["channel"]
 		if !ok {
-			ctx.Error(422, "", "Missing config option: channel")
+			ctx.Error(http.StatusUnprocessableEntity, "", "Missing config option: channel")
 			return nil, false
 		}
 
 		if !utils.IsValidSlackChannel(channel) {
-			ctx.Error(400, "", "Invalid slack channel name")
+			ctx.Error(http.StatusBadRequest, "", "Invalid slack channel name")
 			return nil, false
 		}
 
 			Color:    form.Config["color"],
 		})
 		if err != nil {
-			ctx.Error(500, "slack: JSON marshal failed", err)
+			ctx.Error(http.StatusInternalServerError, "slack: JSON marshal failed", err)
 			return nil, false
 		}
 		w.Meta = string(meta)
 	}
 
 	if err := w.UpdateEvent(); err != nil {
-		ctx.Error(500, "UpdateEvent", err)
+		ctx.Error(http.StatusInternalServerError, "UpdateEvent", err)
 		return nil, false
 	} else if err := models.CreateWebhook(w); err != nil {
-		ctx.Error(500, "CreateWebhook", err)
+		ctx.Error(http.StatusInternalServerError, "CreateWebhook", err)
 		return nil, false
 	}
 	return w, true
 	if err != nil {
 		return
 	}
-	ctx.JSON(200, convert.ToHook(org.HomeLink(), updated))
+	ctx.JSON(http.StatusOK, convert.ToHook(org.HomeLink(), updated))
 }
 
 // EditRepoHook edit webhook `w` according to `form`. Writes to `ctx` accordingly
 	if err != nil {
 		return
 	}
-	ctx.JSON(200, convert.ToHook(repo.RepoLink, updated))
+	ctx.JSON(http.StatusOK, convert.ToHook(repo.RepoLink, updated))
 }
 
 // editHook edit the webhook `w` according to `form`. If an error occurs, write
 		}
 		if ct, ok := form.Config["content_type"]; ok {
 			if !models.IsValidHookContentType(ct) {
-				ctx.Error(422, "", "Invalid content type")
+				ctx.Error(http.StatusUnprocessableEntity, "", "Invalid content type")
 				return false
 			}
 			w.ContentType = models.ToHookContentType(ct)
 					Color:    form.Config["color"],
 				})
 				if err != nil {
-					ctx.Error(500, "slack: JSON marshal failed", err)
+					ctx.Error(http.StatusInternalServerError, "slack: JSON marshal failed", err)
 					return false
 				}
 				w.Meta = string(meta)
 	w.BranchFilter = form.BranchFilter
 
 	if err := w.UpdateEvent(); err != nil {
-		ctx.Error(500, "UpdateEvent", err)
+		ctx.Error(http.StatusInternalServerError, "UpdateEvent", err)
 		return false
 	}
 
 	}
 
 	if err := models.UpdateWebhook(w); err != nil {
-		ctx.Error(500, "UpdateWebhook", err)
+		ctx.Error(http.StatusInternalServerError, "UpdateWebhook", err)
 		return false
 	}
 	return true

templates/swagger/v1_json.tmpl

           "201": {
             "$ref": "#/responses/User"
           },
+          "400": {
+            "$ref": "#/responses/error"
+          },
           "403": {
             "$ref": "#/responses/forbidden"
           },
           "403": {
             "$ref": "#/responses/forbidden"
           },
+          "404": {
+            "$ref": "#/responses/notFound"
+          },
+          "409": {
+            "$ref": "#/responses/error"
+          },
           "422": {
             "$ref": "#/responses/validationError"
           }
           "204": {
             "description": "user is a member"
           },
+          "302": {
+            "description": "redirection to /orgs/{org}/public_members/{username}"
+          },
           "404": {
             "description": "user is not a member"
           }
         "responses": {
           "204": {
             "description": "membership publicized"
+          },
+          "403": {
+            "$ref": "#/responses/forbidden"
           }
         }
       },
         "responses": {
           "204": {
             "$ref": "#/responses/empty"
+          },
+          "403": {
+            "$ref": "#/responses/forbidden"
           }
         }
       }
         "responses": {
           "201": {
             "$ref": "#/responses/Team"
+          },
+          "422": {
+            "$ref": "#/responses/validationError"
           }
         }
       }
         "responses": {
           "201": {
             "$ref": "#/responses/Repository"
+          },
+          "403": {
+            "$ref": "#/responses/forbidden"
+          },
+          "422": {
+            "$ref": "#/responses/validationError"
           }
         }
       }
         "responses": {
           "200": {
             "description": "success"
+          },
+          "404": {
+            "$ref": "#/responses/notFound"
           }
         }
       }
             "$ref": "#/responses/empty"
           },
           "404": {
-            "$ref": "#/responses/empty"
+            "$ref": "#/responses/notFound"
+          },
+          "422": {
+            "$ref": "#/responses/validationError"
           }
         }
       },
         "responses": {
           "204": {
             "$ref": "#/responses/empty"
+          },
+          "422": {
+            "$ref": "#/responses/validationError"
           }
         }
       },
         "responses": {
           "204": {
             "$ref": "#/responses/empty"
+          },
+          "422": {
+            "$ref": "#/responses/validationError"
           }
         }
       }
         "responses": {
           "200": {
             "$ref": "#/responses/Status"
+          },
+          "400": {
+            "$ref": "#/responses/error"
           }
         }
       }
         "responses": {
           "200": {
             "description": "success"
+          },
+          "404": {
+            "$ref": "#/responses/notFound"
           }
         }
       }
         "responses": {
           "202": {
             "$ref": "#/responses/Repository"
+          },
+          "403": {
+            "$ref": "#/responses/forbidden"
+          },
+          "422": {
+            "$ref": "#/responses/validationError"
           }
         }
       }
         "responses": {
           "200": {
             "$ref": "#/responses/GitBlobResponse"
+          },
+          "400": {
+            "$ref": "#/responses/error"
           }
         }
       }
         "responses": {
           "200": {
             "$ref": "#/responses/AnnotatedTag"
+          },
+          "400": {
+            "$ref": "#/responses/error"
           }
         }
       }
         "responses": {
           "200": {
             "$ref": "#/responses/GitTreeResponse"
+          },
+          "400": {
+            "$ref": "#/responses/error"
           }
         }
       }
         "responses": {
           "200": {
             "$ref": "#/responses/Hook"
+          },
+          "404": {
+            "$ref": "#/responses/notFound"
           }
         }
       },
         "responses": {
           "201": {
             "$ref": "#/responses/Issue"
+          },
+          "403": {
+            "$ref": "#/responses/forbidden"
+          },
+          "412": {
+            "$ref": "#/responses/error"
+          },
+          "422": {
+            "$ref": "#/responses/validationError"
           }
         }
       }
         "responses": {
           "204": {
             "$ref": "#/responses/empty"
+          },
+          "403": {
+            "$ref": "#/responses/forbidden"
           }
         }
       },
         "responses": {
           "200": {
             "$ref": "#/responses/ReactionResponseList"
+          },
+          "403": {
+            "$ref": "#/responses/forbidden"
           }
         }
       },
         "responses": {
           "201": {
             "$ref": "#/responses/ReactionResponse"
+          },
+          "403": {
+            "$ref": "#/responses/forbidden"
           }
         }
       },
         "responses": {
           "200": {
             "$ref": "#/responses/empty"
+          },
+          "403": {
+            "$ref": "#/responses/forbidden"
           }
         }
       }
         "responses": {
           "200": {
             "$ref": "#/responses/TrackedTimeList"
+          },
+          "404": {
+            "$ref": "#/responses/notFound"
           }
         }
       },
             "$ref": "#/responses/error"
           },
           "403": {
-            "$ref": "#/responses/error"
+            "$ref": "#/responses/forbidden"
           }
         }
       }
         "responses": {
           "200": {
             "$ref": "#/responses/Issue"
+          },
+          "404": {
+            "$ref": "#/responses/notFound"
           }
         }
       },
         "responses": {
           "201": {
             "$ref": "#/responses/Issue"
+          },
+          "403": {
+            "$ref": "#/responses/forbidden"
+          },
+          "404": {
+            "$ref": "#/responses/notFound"
+          },
+          "412": {
+            "$ref": "#/responses/error"
           }
         }
       }
         "responses": {
           "201": {
             "$ref": "#/responses/Comment"
+          },
+          "403": {
+            "$ref": "#/responses/forbidden"
           }
         }
       }
         "responses": {
           "204": {
             "$ref": "#/responses/empty"
+          },
+          "403": {
+            "$ref": "#/responses/forbidden"
           }
         }
       },
         "responses": {
           "200": {
             "$ref": "#/responses/Comment"
+          },
+          "204": {
+            "$ref": "#/responses/empty"
+          },
+          "403": {
+            "$ref": "#/responses/forbidden"
           }
         }
       }
             "$ref": "#/responses/IssueDeadline"
           },
           "403": {
-            "description": "Not repo writer"
+            "$ref": "#/responses/forbidden"
           },
           "404": {
-            "description": "Issue not found"
+            "$ref": "#/responses/notFound"
           }
         }
       }
         "responses": {
           "200": {
             "$ref": "#/responses/LabelList"
+          },
+          "403": {
+            "$ref": "#/responses/forbidden"
           }
         }
       },
         "responses": {
           "200": {
             "$ref": "#/responses/LabelList"
+          },
+          "403": {
+            "$ref": "#/responses/forbidden"
           }
         }
       },
         "responses": {
           "204": {
             "$ref": "#/responses/empty"
+          },
+          "403": {
+            "$ref": "#/responses/forbidden"
           }
         }
       }
         "responses": {
           "204": {
             "$ref": "#/responses/empty"
+          },
+          "403": {
+            "$ref": "#/responses/forbidden"
+          },
+          "422": {
+            "$ref": "#/responses/validationError"
           }
         }
       }
         "responses": {
           "200": {
             "$ref": "#/responses/ReactionResponseList"
+          },
+          "403": {
+            "$ref": "#/responses/forbidden"
           }
         }
       },
         "responses": {
           "201": {
             "$ref": "#/responses/ReactionResponse"
+          },
+          "403": {
+            "$ref": "#/responses/forbidden"
           }
         }
       },
         "responses": {
           "200": {
             "$ref": "#/responses/empty"
+          },
+          "403": {
+            "$ref": "#/responses/forbidden"
           }
         }
       }
             "description": "Not repo writer, user does not have rights to toggle stopwatch"
           },
           "404": {
-            "description": "Issue not found"
+            "$ref": "#/responses/notFound"
           },
           "409": {
             "description": "Cannot cancel a non existent stopwatch"
             "description": "Not repo writer, user does not have rights to toggle stopwatch"
           },
           "404": {
-            "description": "Issue not found"
+            "$ref": "#/responses/notFound"
           },
           "409": {
             "description": "Cannot start a stopwatch again if it already exists"
             "description": "Not repo writer, user does not have rights to toggle stopwatch"
           },
           "404": {
-            "description": "Issue not found"
+            "$ref": "#/responses/notFound"
           },
           "409": {
             "description": "Cannot stop a non existent stopwatch"
             "$ref": "#/responses/UserList"
           },
           "404": {
-            "description": "Issue not found"
+            "$ref": "#/responses/notFound"
           }
         }
       }
             "description": "User can only subscribe itself if he is no admin"
           },
           "404": {
-            "description": "Issue not found"
+            "$ref": "#/responses/notFound"
           }
         }
       },
             "description": "User can only subscribe itself if he is no admin"
           },
           "404": {
-            "description": "Issue not found"
+            "$ref": "#/responses/notFound"
           }
         }
       }
         "responses": {
           "201": {
             "$ref": "#/responses/DeployKey"
+          },
+          "422": {
+            "$ref": "#/responses/validationError"
           }
         }
       }
         "responses": {
           "204": {
             "$ref": "#/responses/empty"
+          },
+          "403": {
+            "$ref": "#/responses/forbidden"
           }
         }
       }
         "responses": {
           "200": {
             "$ref": "#/responses/empty"
+          },
+          "403": {
+            "$ref": "#/responses/forbidden"
           }
         }
       }
         "responses": {
           "201": {
             "$ref": "#/responses/PullRequest"
+          },
+          "409": {
+            "$ref": "#/responses/error"
+          },
+          "422": {
+            "$ref": "#/responses/validationError"
           }
         }
       }
         "responses": {
           "201": {
             "$ref": "#/responses/PullRequest"
+          },
+          "403": {
+            "$ref": "#/responses/forbidden"
+          },
+          "412": {
+            "$ref": "#/responses/error"
+          },
+          "422": {
+            "$ref": "#/responses/validationError"
           }
         }
       }
           },
           "405": {
             "$ref": "#/responses/empty"
+          },
+          "409": {
+            "$ref": "#/responses/error"
           }
         }
       }
         "responses": {
           "200": {
             "description": "success"
+          },
+          "404": {
+            "$ref": "#/responses/notFound"
           }
         }
       }
         "responses": {
           "201": {
             "$ref": "#/responses/Release"
+          },
+          "409": {
+            "$ref": "#/responses/error"
           }
         }
       }
         "responses": {
           "201": {
             "$ref": "#/responses/Attachment"
+          },
+          "400": {
+            "$ref": "#/responses/error"
           }
         }
       }
         "responses": {
           "200": {
             "$ref": "#/responses/StatusList"
+          },
+          "400": {
+            "$ref": "#/responses/error"
           }
         }
       },
         "responses": {
           "201": {
             "$ref": "#/responses/Status"
+          },
+          "400": {
+            "$ref": "#/responses/error"
           }
         }
       }
         "responses": {
           "200": {
             "$ref": "#/responses/TrackedTimeList"
+          },
+          "400": {
+            "$ref": "#/responses/error"
           }
         }
       }
         "responses": {
           "200": {
             "$ref": "#/responses/TrackedTimeList"
+          },
+          "400": {
+            "$ref": "#/responses/error"
           }
         }
       }
         "responses": {
           "204": {
             "$ref": "#/responses/empty"
+          },
+          "422": {
+            "$ref": "#/responses/invalidTopicsError"
           }
         }
       }
         "responses": {
           "204": {
             "$ref": "#/responses/empty"
+          },
+          "422": {
+            "$ref": "#/responses/invalidTopicsError"
           }
         }
       },
         "responses": {
           "204": {
             "$ref": "#/responses/empty"
+          },
+          "422": {
+            "$ref": "#/responses/invalidTopicsError"
           }
         }
       }
         "responses": {
           "200": {
             "$ref": "#/responses/User"
+          },
+          "404": {
+            "$ref": "#/responses/notFound"
           }
         }
       },
         "responses": {
           "204": {
             "$ref": "#/responses/empty"
+          },
+          "404": {
+            "$ref": "#/responses/notFound"
           }
         }
       },
         "responses": {
           "204": {
             "$ref": "#/responses/empty"
+          },
+          "404": {
+            "$ref": "#/responses/notFound"
           }
         }
       }
         "responses": {
           "204": {
             "$ref": "#/responses/empty"
+          },
+          "403": {
+            "$ref": "#/responses/forbidden"
           }
         }
       },
         "responses": {
           "204": {
             "$ref": "#/responses/empty"
+          },
+          "403": {
+            "$ref": "#/responses/forbidden"
           }
         }
       }
         "responses": {
           "200": {
             "$ref": "#/responses/TopicListResponse"
+          },
+          "403": {
+            "$ref": "#/responses/forbidden"
           }
         }
       }
         "responses": {
           "201": {
             "$ref": "#/responses/EmailList"
+          },
+          "422": {
+            "$ref": "#/responses/validationError"
           }
         }
       },
         }
       }
     },
+    "invalidTopicsError": {
+      "description": "APIInvalidTopicsError is error format response to invalid topics",
+      "headers": {
+        "invalidTopics": {
+          "type": "array",
+          "items": {
+            "type": "string"
+          }
+        },
+        "message": {
+          "type": "string"
+        }
+      }
+    },
     "notFound": {
       "description": "APINotFound is a not found empty response"
     },