[nginx] support http2 per server

[Valentin V. Bartenev]

On Friday 09 June 2017 00:08:06 洪志道 wrote:
> "
> 
>    For "https" resources, connection reuse additionally depends on
>    having a certificate that is valid for the host in the URI.  The
>    certificate presented by the server MUST satisfy any checks that the
>    client would perform when forming a new TLS connection for the host
>    in the URI.
> 
> "
> 
> 
> It seems the brower can prevent the unreasonable behavior.
> 
> 
> In reallity, It still exist some clients that dosen't perfom well in http2.
> 
> So it's kind of valuable to enable http2 by server.
> 
> 
> It's not a good idea the put the patch in nginx,
> 
> Can you help to check the patch whether contains serious problem?
> 
> 
> Maybe it's helpful for other guys.
> 
> 
> Thanks again.
> 
[..]

The most serious problem with the patch, that it gives an illusion
that HTTP/2 can be enabled per virtual server basis, but in fact it
doesn't prevent requests to any server on particular listen socket
using already existing HTTP/2 connection.

Also please note that with your patch clients are still able to
negotiate HTTP/2 even if nginx doesn't announce it.

I don't see any other serious problems.

  wbr, Valentin V. Bartenev