Bug#880195: apache2: Trying to use ws:// in proxy results in "No protocol handler was valid for the URL /ws .... "

[Martin Sebald]

Hello all,

I am experiencing the same problem as described here with apache2 version
2.4.38-3+deb10u3 (buster) and also version 2.4.43-1~bpo10+1 (buster-backports).

The proxy modules are loaded but I cannot proxy WebSocket with Apache2. Here's
some more information:


"apache2ctl -M | grep proxy" gives me:

proxy_module (shared)
proxy_http_module (shared)
proxy_wstunnel_module (shared)

I'm trying to proxy WebSocket of Prosody XMPP Server like described here:
https://prosody.im/doc/websocket

This is in my vHost config:



ProxyTimeout 900

ProxyPreserveHost On
ProxyPass "ws://localhost:5280/xmpp-websocket"




It does not matter if I try to proxy "ws" or "wss".

The error message is the following:

[Wed Jul 22 23:19:46.651199 2020] [proxy:warn] [pid 13332:tid 139973210351360]
[client xxx] AH01144: No protocol handler was valid for the URL
/xmpp-websocket (scheme 'wss'). If you are using a DSO version of mod_proxy,
make sure the proxy submodules are included in the configuration using 
LoadModule.

[Wed Jul 22 23:37:54.853492 2020] [proxy:warn] [pid 8816:tid 140146156889856]
[client xxx] AH01144: No protocol handler was valid for the URL
/xmpp-websocket (scheme 'wss'). If you are using a DSO version of mod_proxy,
make sure the proxy submodules are included in the configuration using 
LoadModule.


Is this a bug or some configuration thing? I doublechecked everything and I
think it is a bug.

Looking forward for help.

Thank you and regards,
Martin

Bug#880195: apache2: Trying to use ws:// in proxy results in "No protocol handler was valid for the URL /ws .... "

[Libor Klepáč]

Hi,
just tried it on Sid with apache2 2.4.29-1, it shows same error

With regards,
Libor

Bug#880195: apache2: Trying to use ws:// in proxy results in "No protocol handler was valid for the URL /ws .... "

[Libor Klepáč]

Package: apache2
Version: 2.4.25-3+deb9u3
Severity: normal

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Hash: SHA256

Dear Maintainer,

i'm trying to enable websocket proxy for customer on web server running Stretch.

After enabling module
# a2enmod proxy_wstunnel 
Considering dependency proxy for proxy_wstunnel:
Module proxy already enabled
Enabling module proxy_wstunnel.
To activate the new configuration, you need to run:
  systemctl restart apache2

and restarting apache, i try to use this snippet in vhost configuration

ProxyPass "/ws" "ws://127.0.0.1:9000/"
ProxyPassReverse "/ws" "ws://127.0.0.1:9000/"
ProxyPass "/wss" "ws://127.0.0.1:9000/"
ProxyPassReverse "/wss" "ws://127.0.0.1:9000/"


it ends with internal server error and log says
 AH01144: No protocol handler was valid for the URL /ws. If you are using a DSO 
version of mod_proxy, make sure the proxy submodules are included in the 
configuration using LoadModule.

Acording to
# apache2ctl -M | grep proxy
 proxy_module (shared)
 proxy_http_module (shared)
 proxy_wstunnel_module (shared)

all modules are loaded.

This apache runs MPM prefork+itk, I also tried on another host, running same 
version but with MPM event, to eliminate influence of itk (I know, it cannot be 
run with mod_http2 for example), with same result.

Don't know, what to test next

With regards,
Libor 

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