Ajax: Don't process non-string data property on no-entity-body requests

Fixes gh-3438
Closes gh-3781

2 files changed, 34 insertions, 3 deletions

diff --git a/src/ajax.js b/src/ajax.js
index dd1321240..aec26830a 100644
--- a/src/ajax.js
+++ b/src/ajax.js
@@ -597,8 +597,8 @@ jQuery.extend( {
 			// Remember the hash so we can put it back
 			uncached = s.url.slice( cacheURL.length );
 
-			// If data is available, append data to url
-			if ( s.data ) {
+			// If data is available and should be processed, append data to url
+			if ( s.data && ( s.processData || typeof s.data === "string" ) ) {
 				cacheURL += ( rquery.test( cacheURL ) ? "&" : "?" ) + s.data;
 
 				// #9682: remove data so that it's not used in an eventual retry
diff --git a/test/unit/ajax.js b/test/unit/ajax.js
index 26aa3ad21..ab5ce24a8 100644
--- a/test/unit/ajax.js
+++ b/test/unit/ajax.js
@@ -1274,7 +1274,7 @@ QUnit.module( "ajax", {
 		};
 	} );
 
-	ajaxTest( "jQuery.ajax() - data - no processing ", 1, function( assert ) {
+	ajaxTest( "jQuery.ajax() - data - no processing POST", 1, function( assert ) {
 		return {
 			url: "bogus.html",
 			data: { devo: "A Beautiful World" },
@@ -1289,6 +1289,37 @@ QUnit.module( "ajax", {
 		};
 	} );
 
+	ajaxTest( "jQuery.ajax() - data - no processing GET", 1, function( assert ) {
+		return {
+			url: "bogus.html",
+			data: { devo: "A Beautiful World" },
+			type: "get",
+			contentType: "x-something-else",
+			processData: false,
+			beforeSend: function( _, s ) {
+				assert.deepEqual( s.data, { devo: "A Beautiful World" }, "data is not processed" );
+				return false;
+			},
+			error: true
+		};
+	} );
+
+		ajaxTest( "jQuery.ajax() - data - process string with GET", 2, function( assert ) {
+		return {
+			url: "bogus.html",
+			data: "a=1&b=2",
+			type: "get",
+			contentType: "x-something-else",
+			processData: false,
+			beforeSend: function( _, s ) {
+				assert.equal( s.url, "bogus.html?a=1&b=2", "added data to url" );
+				assert.equal( s.data, undefined, "removed data from settings" );
+				return false;
+			},
+			error: true
+		};
+	} );
+
 	var ifModifiedNow = new Date();
 
 	jQuery.each(