http/2 first experiences

Tom Anheyer Tom.Anheyer at
Tue Oct 4 16:26:22 CEST 2016

Ok, thanks for your answer. Im waiting for version 5.0.1 to 5.0.99 to 
check new features. :)


Am 04.10.2016 um 16:06 schrieb Dridi Boukelmoune:
> On Tue, Oct 4, 2016 at 1:31 PM, Tom Anheyer <Tom.Anheyer at> wrote:
>> Hello,
>> I've setup a little test environment with varnish5 and hitch as TLS
>> offloader. HTTP/2 works for me in FF and Chrome (after upgrading to openssl
>> 1.0.2).
> Hello Tom,
> This is fantastic, thanks for the feedback on h2 using hitch+varnish.
>> Which H2 features are supported so far?
> I haven't looked closely, but if everything went according to plan,
> the bare minimum (eg. varnish does not compress response headers
> etc).
>> How to do server push? If not supported yet - Is it planned?
> It is planned, I don't know when it will land, and when it lands it
> will probably introduce either a VMOD or new VCL syntax.
>> 2016 11:26:36 GMT
>>                                           "Incomplete code in
>> h2_rx_rst_stream(), http2/cache_http2_proto.c line 113:
> So apparently you reached one of the things Varnish doesn't implement
> yet, in this case RST frames. Your browser tried to cancel a request
> and close the related streams and Varnish doesn't support it.
> Spoiler alert, your browser may crash with DATA, PUSH_PROMISE and
> The push makes no sense for a client, so you can ignore it if we
> assume a sane browser.
> You should be able to crash Varnish too if you send a request with a
> body (eg. POST) or with very large headers (eg. tracking cookies).
> Cheers,
> Dridi

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