SPDY add_header with Alternate-Protocol

[Richard Fussenegger]

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.

For example seen at: 
https://github.com/h5bp/server-configs-nginx/blob/master/h5bp/directive-only/spdy.conf

Best
Richard

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