Take into account HTTP 2.0 new capabilities

[jlouvel]

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)