diff --git a/Rest/ContentUserGateway.php b/Rest/ContentUserGateway.php
index <HASH>..<HASH> 100644
--- a/Rest/ContentUserGateway.php
+++ b/Rest/ContentUserGateway.php
@@ -104,6 +104,7 @@ class ContentUserGateway implements EventSubscriberInterface
         foreach ($requestHeaders as $headerName => $headerValue) {
             $headers[$this->fixHeaderCase($headerName)] = implode('; ', $headerValue);
         }
+        $headers['Url'] = $request->getPathInfo();
 
         return new Message($headers, $request->getContent());
     }
Added 'Url' expected header to ContentUserGateway Message

Some REST Input Parsers expect an Url as a header, that gets
mapped to __url in the message by the ParsingDispatcher.

The Gateway wasn't setting this index.