title: Php + Urban Airship + Amazon EC2 Server
body: <p>I'm trying to implemnet a push notification server.</p>
  
  <p>I'm using:
  php + Urban Airship + Amazon EC2 Server.</p>
  
  <p>When I try to run the php libary of urban airship I get an error (500).</p>
  
  <p>I think I need to install the HTTP_Request package on my server.</p>
  
  <p>Can anyone explain me how to do it?</p>