Not really. The HTTPS requests can choose SPDY using the Next-Protocol-Negotiation(NPN). Alternate protocol header would matter only to HTTP requests to know t

Not really. The HTTPS requests can choose SPDY using the Next-Protocol-Negotiation(NPN). Alternate protocol header would matter only to HTTP requests to know this server is capable of supporting SPDY. However, as per the latest post by Opera Labs[1], all 3 major browsers supporting SPDY doesn't handles this header correctly. Also, it's not mentioned in SPDY draft 3. [1] http://dev.opera.com/articles/view/opera-spdy-build/ http://dev.opera.com/articles/view/opera-spdy-build/