<<
  POST / HTTP/1.1
  Host: ig-game.appspot.com
  ...

  >>
  HTTP/1.1 403 Forbidden
  Alternate-Protocol: 443:quic,p=0.02
  Cache-Control: no-cache
  Content-Length: 0
  Content-Type: text/html; charset=utf-8
  Date: Tue, 25 Nov 2014 21:32:12 GMT
  Server: Google Frontend
  Set-Cookie: session=(snip); Path=/; HttpOnly
  X-Firefox-Spdy: 3.1