WebSockets and Apache proxy: how to configure mod_proxy_wstunnel?

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I finally managed to do it, thanks to this topic. TODO:

1) Have Apache 2.4 installed (doesn’t work with 2.2), and do:

a2enmod proxy
a2enmod proxy_http
a2enmod proxy_wstunnel

2) Have nodejs running on port 3001

3) Do this in the Apache config

<VirtualHost *:80>
  ServerName example.com

  RewriteEngine On
  RewriteCond %{REQUEST_URI}  ^/socket.io            [NC]
  RewriteCond %{QUERY_STRING} transport=websocket    [NC]
  RewriteRule /(.*)           ws://localhost:3001/$1 [P,L]

  ProxyPass / http://localhost:3001/
  ProxyPassReverse / http://localhost:3001/
</VirtualHost>

Note: if you have more than one service on the same server that uses websockets, you might want to do this to separate them.

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