title: Sending push notification without server: web app to android
body: <p>I'm totally new to hybrid world so I have to ask first.</p>
  
  <p><strong>Can I send notifications through GCM without a server?</strong></p>
  
  <p>I mean, I'm building a SPA with AngularJS and Firebase, but my customer asked me to make a dashboard for Android, so every time an user makes an order, they (both dashboard administrators) receive a PUSH notification on their phone: "A new order has been created", and when they "tap", the application opens.</p>
  
  <p>I've been reading something about <code>/topic/</code> endpoint to notify both of them, but I think I still need a server to do it. Do I?
  It would be great if I simply <code>post</code> a http query using something like AngularJS' <code>$http</code> service to tell GCM to send a notification for that <code>topic</code>/<code>usergroup</code>.</p>
  
  <p>Is that possible? If so, any idea about how?
  Thank you very much in advance!</p>