Merge branch '4.4' into 5.0

* 4.4:
  Change code example for custom header when using a reverse proxy

deployment/proxies.rst

@@ -107,7 +107,7 @@ In this case, you'll need to set the header ``X-Forwarded-Proto`` with the value
     // public/index.php
 
     // ...
-    $_SERVER['HEADER_X_FORWARDED_PROTO'] = $_SERVER['HEADER_CUSTOM_FORWARDED_PROTO'];
+    $_SERVER['HTTP_X_FORWARDED_PROTO'] = $_SERVER['HTTP_CUSTOM_FORWARDED_PROTO'];
     // ...
     $response = $kernel->handle($request);