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by laktek 5089 days ago
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/