CODEWITHSUNDEEP
linuxapacheubuntuwebsocketplesk
Mr. Jo
Mr. Jo

Reputation: 5251

Apache reverse proxy for Mattermost: No protocol handler was valid for the URL /api/v4/websocket

I really need your help! I've posted this question a month ago in a lot of linux and web forums and also directly at Mattermost but without any success and I really really need this tool. So I hope you came across this problem by yourself and maybe you can help me.

Since I'm already using GitLab and GitLab comes with a build-in Mattermost installation, I used that one. After installing it, I can reach Mattermost via 127.0.0.1:8065. So far so good but since I want to use it via an URL, I've created a subdomain in Plesk and added some additional Apache directives like described here:

HTTP:

RewriteEngine On
RewriteCond %{HTTPS} !=on
RewriteCond %{REQUEST_URI} !^/.well-known/.*
RewriteRule  ^/(.*)  https://%{HTTP_HOST}/$1  [last,redirect=301]

HTTPS:

ServerName mattermost.xxx.de
ProxyPreserveHost On

RequestHeader set "X-Forwarded-Proto" expr=%{REQUEST_SCHEME}
RequestHeader set "X-Forwarded-SSL" expr=%{HTTPS}

RewriteEngine On
RewriteCond %{REQUEST_URI} /api/v[0-9]+/(users/)?websocket [NC,OR]
RewriteCond %{HTTP:UPGRADE} ^WebSocket$ [NC,OR]
RewriteCond %{HTTP:CONNECTION} ^Upgrade$ [NC]
RewriteRule .* ws://127.0.0.1:8065%{REQUEST_URI} [P,QSA,L]

<Location />
    Require all granted
    ProxyPass http://127.0.0.1:8065/
    ProxyPassReverse http://127.0.0.1:8065/
    ProxyPassReverseCookieDomain 127.0.0.1 mattermost.xxx.de
</Location>

ErrorLog /var/log/apache2/mattermost_error.log
CustomLog /var/log/apache2/mattermos_forwarded.log common_forwarded
CustomLog /var/log/apache2/mattermos_access.log combined env=!dontlog
CustomLog /var/log/apache2/mattermos.log combined

Also I've enabled SSL for that domain directly inside Plesk with Lets Encrypt. To be sure everything works, I've also allowed unsecure connections from Mattermost because of a self-signed certificate.

I'm now able to reach Mattermost via https and also the certificate looks great. But now I've a big problem: The websocket don't works and I'm getting this error inside my console:

enter image description here

Without a websocket, a chatting tool makes no sense. Also I've found this error inside the custom error log defined in the additional directives above:

AH01144: No protocol handler was valid for the URL /api/v4/websocket (scheme 'ws'). If you are using a DSO version of mod_proxy, make sure the proxy submodules are included in the configuration using LoadModule.

I've researched a lot about this issue and enabled a lot of Apache modules in Plesk but without any success:

enter image description here

I really need this for an important dev project. I hope you know an answer - I am at the end of my rope...

Upvotes: 0

Views: 2913

Answers (1)

on8tom
on8tom

Reputation: 1894

ditch the rewrite rules and use proxypassmatch

proxyPassMatch ^(/api/v[0-9]+/(users/)?websocket.*)$      ws://127.0.0.1:8065/$1

EDIT

<VirtualHost *:443>
  ServerName mattermost.xxx.de

  ##ssl stuff

  RequestHeader set "X-Forwarded-Proto" expr=%{REQUEST_SCHEME}
  RequestHeader set "X-Forwarded-SSL" expr=%{HTTPS}

  proxyPassMatch ^(/api/v[0-9]+/(users/)?websocket.*)$ ws://127.0.0.1:8065/$1
  ProxyPass / http://127.0.0.1:8065/
  ProxyPassReverse / http://127.0.0.1:8065/
  ProxyPassReverseCookieDomain 127.0.0.1 mattermost.xxx.de

  ProxyPreserveHost On

  ErrorLog /var/log/apache2/mattermost_error.log
  CustomLog /var/log/apache2/mattermos_forwarded.log common_forwarded
  CustomLog /var/log/apache2/mattermos_access.log combined env=!dontlog
  CustomLog /var/log/apache2/mattermos.log combined
</VirtualHost>

Upvotes: 1

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