title: Firebase message not received
body: <p>I initialize Web firebase and I get Token:</p>
  
  <p><a href="https://github.com/MarcinMoskala/KotlinAcademyApp/blob/master/web/src/main/web/js/initFirebase.js" rel="nofollow noreferrer">https://github.com/MarcinMoskala/KotlinAcademyApp/blob/master/web/src/main/web/js/initFirebase.js</a></p>
  
  <p>I get current token after it is created and I send it in simple message:</p>
  
  <pre><code>curl -X POST -H "Authorization: key=AAAA_XXXMYKEYXXXw26gv" -H "Content-Type: application/json" -d '{
      "to" : "fo3aexgjsbQ:APA91bEWh47m2cVoflhQ_E__E31jbQpoyaHZTRKmkJIG7Uaarrw0KwvCYYCnNTMmaQIcKBFrq2fGFEBj-nVB9obE-wf4FiTCKedR_gWdMPfc8bNgpK5MQ7SsLmcVRWLlert3AXXdbuzk",
      "data" : {
        "body" : "This is an FCM notification message!",
        "title" : "FCM Message",
      }
  }' "https://fcm.googleapis.com/fcm/send"
  </code></pre>
  
  <p>I get the following success result:</p>
  
  <pre><code>{"multicast_id":8683406144829883570,"success":1,"failure":0,"canonical_ids":0,"results":[{"message_id":"0:1512147661586241%2fd9afcdf9fd7ecd"}]}
  </code></pre>
  
  <p>The problem is that nothing is displayed or printed in the console! I am sending request, I see success and... nothing happend both when website is opened and when it is closed!</p>
  
  <p>Here is my firebase-messaging-sw.js file placed in root directory:</p>
  
  <p><a href="https://github.com/MarcinMoskala/KotlinAcademyApp/blob/master/web/src/main/web/firebase-messaging-sw.js" rel="nofollow noreferrer">https://github.com/MarcinMoskala/KotlinAcademyApp/blob/master/web/src/main/web/firebase-messaging-sw.js</a></p>
  
  <p>I also tried to set configuration this way:</p>
  
  <pre><code>firebase.initializeApp({
    'messagingSenderId': '1091715558873'
  });
  </code></pre>
  
  <p>I specified manifest:</p>
  
  <p><a href="https://github.com/MarcinMoskala/KotlinAcademyApp/blob/master/web/src/main/web/manifest.json" rel="nofollow noreferrer">https://github.com/MarcinMoskala/KotlinAcademyApp/blob/master/web/src/main/web/manifest.json</a></p>