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A comment on Nginx 1.5.10 released with SPDY 3.1 support. Parent comment

Re:Nginx 1.5.10 released with SPDY 3.1 support by nodesocket on Tuesday February 04, 2014 @01:13PM (#7179196)
What does the following header do?

    add_header                    Alternate-Protocol  443:npn-spdy/3;
Also, what exactly does deferred do on the listen directive?
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Re:Nginx 1.5.10 released with SPDY 3.1 support by conductor on Tuesday February 04, 2014 @01:58PM (#7179517)
This is from the section 3.3.1 of SPDY Protocol - Draft 2 [0]:

"When a server receives a non-SPDY request which could have been served via SPDY, it should append a Alternate-Protocol header into the response stream. Note that it is valid to have multiple Alternate-Protocols headers. The field-value can also be specified as a comma-separated list, as per RFC2616 section 4.2."

And you can read about "deferred" here: https://stackoverflow.com/questions/8449058/what-does-the-de...

[0] - http://dev.chromium.org/spdy/spdy-protocol/spdy-protocol-dra...

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Re:Nginx 1.5.10 released with SPDY 3.1 support by elithrar on Tuesday February 04, 2014 @06:50PM (#7181032)
> And you can read about "deferred" here: https://stackoverflow.com/questions/8449058/what-does-the-de...

Thanks for the link; I'm curious as to the downsides however (the article linked in the article doesn't fully cover them), and a Google search doesn't yield anything concrete (i.e. deferred on vs. off).

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