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go-retryablehttp
================
[][travis]
[][godocs]
[travis]: http://travis-ci.org/hashicorp/go-retryablehttp
[godocs]: http://godoc.org/github.com/hashicorp/go-retryablehttp
The `retryablehttp` package provides a familiar HTTP client interface with
automatic retries and exponential backoff. It is a thin wrapper over the
standard `net/http` client library and exposes nearly the same public API. This
makes `retryablehttp` very easy to drop into existing programs.
`retryablehttp` performs automatic retries under certain conditions. Mainly, if
an error is returned by the client (connection errors, etc.), or if a 500-range
response code is received (except 501), then a retry is invoked after a wait
period. Otherwise, the response is returned and left to the caller to
interpret.
The main difference from `net/http` is that requests which take a request body
(POST/PUT et. al) can have the body provided in a number of ways (some more or
less efficient) that allow "rewinding" the request body if the initial request
fails so that the full request can be attempted again. See the
[godoc](http://godoc.org/github.com/hashicorp/go-retryablehttp) for more
details.
Version 0.6.0 and before are compatible with Go prior to 1.12. From 0.6.1 onward, Go 1.12+ is required.
Example Use
===========
Using this library should look almost identical to what you would do with
`net/http`. The most simple example of a GET request is shown below:
```go
resp, err := retryablehttp.Get("/foo")
if err != nil {
panic(err)
}
```
The returned response object is an `*http.Response`, the same thing you would
usually get from `net/http`. Had the request failed one or more times, the above
call would block and retry with exponential backoff.
## Getting a stdlib `*http.Client` with retries
It's possible to convert a `*retryablehttp.Client` directly to a `*http.Client`.
This makes use of retryablehttp broadly applicable with minimal effort. Simply
configure a `*retryablehttp.Client` as you wish, and then call `StandardClient()`:
```go
retryClient := retryablehttp.NewClient()
retryClient.RetryMax = 10
standardClient := retryClient.StandardClient() // *http.Client
```
For more usage and examples see the
[godoc](http://godoc.org/github.com/hashicorp/go-retryablehttp).
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