On Jan 15, 2015, at 6:21 PM, Richard Fussenegger <[email protected]> 
wrote:
> I'm often seeing the advice to add the following line to your SPDY 
> configuration:
> 
> add_header Alternate-Protocol  443:npn-spdy/3;
> 
> Is this actually necessary? I mean, my Firefox is connecting via SPDY to my 
> nginx and I don’t have this in my configuration.

The Alternate-Protocol header is used for advertising such capability,
It is mentioned in SPDY/2 draft, and later removed.

draft-ietf-httpbis-alt-svc was influenced by its design for the Alt-Svc header.

-- 
Sergey Kandaurov

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