Merge pull request #285 in ZP/z-push from...

Merge pull request #285 in ZP/z-push from feature/ZP-964-pass-z-push-version-in-an-additional to develop

* commit '15724c36':
  ZP-964 Expose Z-Push version via additional header to authenticated users.

src/index.php

@@ -179,6 +179,10 @@ include_once('version.php');
         // Do the actual request
         header(ZPush::GetServerHeader());
 
+        if (RequestProcessor::isUserAuthenticated()) {
+            header("X-Z-Push-Version: ". @constant('ZPUSH_VERSION'));
+        }
+
         // announce the supported AS versions (if not already sent to device)
         if (ZPush::GetDeviceManager()->AnnounceASVersion()) {
             $versions = ZPush::GetSupportedProtocolVersions(true);