title: How to see number of recipients for FCM
body: <p>I make a request to <code>https://fcm.googleapis.com/fcm/send</code> with the following json data:</p>
  
  <pre><code>{
      "to": "/topics/push_topic",
  
      "data" : {
          "language": "tr,en_us",
          "ticker": "...",
          "tickerEnglish": "...",
          "body": "...",
      }
  }
  </code></pre>
  
  <p>The response I receive is the following (The message is sent successfully):</p>
  
  <pre><code>{
      "message_id": xxxxxxxxxxxxx
  }
  </code></pre>
  
  <p>But according to the documentation,  I am supposed to receive a response like the following:</p>
  
  <pre><code>{
      "multicast_id": 216,
      "success": 3,
      "failure": 3,
      "canonical_ids": 1,
      "results": [
          { "message_id": "1:0408" },
          { "error": "Unavailable" },
          { "error": "InvalidRegistration" },
          { "message_id": "1:1516" },
          { "message_id": "1:2342", "registration_id": "32" },
          { "error": "NotRegistered"}
       ]
  }    
  </code></pre>
  
  <p>So, why can't I see success and failure variables in my response? Is that because I send the message to a topic?</p>
  
  <p>Thanks.</p>