title: GCM push notifications not coming through proxy
body: <p>I'm developing a small app for my course project (similar to Snapchat) that allows one to send and receive pictures and videos. I'm using a BaaS called Parse which uses GCM to deliver push notifications. However, the problem is that my campus uses a proxy network due to which numerous apps do not work (WhatsApp, Instagram) while some apps (Snapchat) work but their notifications are not delivered. Same is the case with my app.</p>
  
  <p>Is there any possible way to overcome this problem assuming I do not have any influence over the proxy network and cellular network is out of options.</p>
  
  <p><img src="https://i.stack.imgur.com/sxSmP.jpg" alt="enter image description here"></p>