title: Check result of sent message via REST API on Google FCM?
body: <p>When I send message to Google FCM server via REST API the response body has <code>message_id</code> data. Can I use that id to get information about the message (delivery time etc.) ? Here is the communication:</p>
  
  <p><strong>Request</strong>:</p>
  
  <p>URL: </p>
  
  <pre><code>https://fcm.googleapis.com/fcm/send   POST
  </code></pre>
  
  <p>Headers:</p>
  
  <pre><code>Content-Type    application/json
  Authorization   key=MY_KEY
  </code></pre>
  
  <p>Body</p>
  
  <pre><code>{
     "to": "/topics/fls",
     "data": {
        "count": "21",
     }
  }
  </code></pre>
  
  <p><strong>Response</strong></p>
  
  <p>Body</p>
  
  <pre><code>{"message_id":1234}
  </code></pre>
  
  <p>So I need to check result info via REST like this:</p>
  
  <pre><code>https://fcm.googleapis.com/fcm/info?message_id=1234
  </code></pre>
  
  <p>Is it possible?</p>