title: Firebase Invalid Project Id when trying to recover lost group notification key
body: <p>While testing my server-side php functions to create device groups i lost track of the <code>notification key</code> returned as a result of successfully creating a device group.</p>
  
  <p>As described in <a href="https://groups.google.com/forum/#!topic/firebase-talk/ytovugx8XNs" rel="nofollow noreferrer">https://groups.google.com/forum/#!topic/firebase-talk/ytovugx8XNs</a> i tried</p>
  
  <pre><code>curl -v  -H Content-Type:application/json -H Authorization:key=&lt;your api key&gt; 
  -H project_id:&lt;your project id&gt; 
  https://android.googleapis.com/gcm/notification?notification_key_name=testgroup
  </code></pre>
  
  <p>where the project id is the one found in firebase console, the same shown in the url and the very same present even in my <code>google-services.json</code></p>
  
  <p>As a result i get </p>
  
  <blockquote>
    <p>HTTP/1.1 400 Bad Request  Content-Type: application/json;
    charset=UTF-8  Date: Tue, 18 Apr 2017 08:21:30 GMT  Expires: Tue, 18
    Apr 2017 08:21:30 GMT  Cache-Control: private, max-age=0 
    X-Content-Type-Options: nosniff  X-Frame-Options: SAMEORIGIN 
    X-XSS-Protection: 1; mode=block  Server: GSE  Alt-Svc: quic=":443";
    ma=2592000; v="37,36,35"  Accept-Ranges: none  Vary: Accept-Encoding 
    Transfer-Encoding: chunked<br>
    * Curl_http_done: called premature == 0
    * Connection #0 to host android.googleapis.com left intact {"error":"INVALID_PROJECT_ID"}</p>
  </blockquote>
  
  <p>I can't find a way out of this, since after losing a notification key the only way to recover it is with that command (afaik) . Please help.</p>