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From Stefan Eissing <>
Subject Re: [users@httpd] Potential HTTP/2 Bug within Apache 2.4.18
Date Mon, 14 Mar 2016 09:35:20 GMT

> Am 13.03.2016 um 04:18 schrieb Russel Van Tuyl <>:
> I'm running an Apache 2.4.18 web server (Server-A) compiled from source as a reverse
proxy. I'm using ProxyPass on Server-A to pass traffic to a proxy, nghttpx, listening on
This nghttpx proxy sends traffic to a second server, Server-B, across the network. Connections
from a web browser on Client-C work fine connecting to Server-A that connects to nghttpx proxy
on that connects to Server-B. These connections only work when Server-B is
using Apache 2.4.17. When Server-B is using Apache 2.4.18 the connection errors out and will
not complete. The exact error message is down below this narrative. I'm not sure why it is
requesting http://(null)/ . At this point, the only that has changes is Server-B's version
of Apache. Neither Server-A or the nghttpx's configuration change, just the version of Apache
on Server-B. I've built both Apache 2.4.17 and 2.4.18 from source on Server-B using the same
configurations. The debug output from mod_http2 for both a failed and successful connection
can be found here: . Is this is a bug in Apache 2.4.18 or is
there something else I can try and do to narrow the problem down?
> [Sat Mar 12 20:54:53.087621 2016] [http2:debug] [pid 21439:tid 140096657385216] h2_stream.c(321):
[client] h2_stream(73-1): RST=2 (internal err) GET http://(null)/

What I see from the 2.4.18 log is that the incoming request has no ':authority' header and
is rejected. Reading RFC 7540 carefully, this is a bug. The nghttpx, acting as h1->h2 proxy
MUST not send and :authority header. nghttpx does everything right and mod_http2 has it wrong.

Are you able to apply/test a patch?

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