Merge branch '6577' of github.com:piwik/piwik into 6577

CHANGELOG.md

@@ -2,6 +2,10 @@
 
 This is a changelog for Piwik platform developers. All changes for our HTTP API's, Plugins, Themes, etc will be listed here.
 
+## Piwik 2.10.0
+
+### New APIs
+* New URL parameter `send_image=0` in the [HTTP Tracking API](http://developer.piwik.org/api-reference/tracking-api) to receive a HTTP 204 response code instead of a GIF image. This improves performance and can fix errors if images are not allowed to be obtained directly (eg Chrome Apps).
 
 ## Piwik 2.9.0
 

core/Tracker.php

@@ -666,7 +666,7 @@ class Tracker
         $request = $_GET + $_POST;
 
         if (array_key_exists('send_image', $request) && $request['send_image'] === '0') {
-            Common::sendHeader("HTTP/1.0 204 No Response");
+            Common::sendHeader("HTTP/1.1 204 No Response");
             return;
         }