Take into account HTTP 2.0 new capabilities

See latest HTTP 2.0 draft:
http://tools.ietf.org/html/draft-ietf-httpbis-http2-02

HTTP 1.1 had focus on:
- implementation simplicity
- accessibility

HTTP 2.0 has focus on:
- better application performance
- optimized mapping of the HTTP semantics to a TCP connection
- server push (like GET requests initiated by the server)
- less network connections (one per domain)
