Why Does My mod_proxy_wstunnel and Go-websocket Setup Fail, and How Can I Fix It?

Mod_proxy_wstunnel and Go-websocket: A Problem and Its Resolution

In an attempt to employ Apache's mod_proxy_wstunnel with the go-websocket implementation, users may encounter obstacles. One user sought assistance in configuring the necessary settings.

A detailed description of the issue was provided: while the reverse proxy established successfully, the websocket connection failed to initiate. The user's configuration mirrored the following:

<VirtualHost *:80>
    DocumentRoot /var/www/foobar
    ServerName foobar.com
    ProxyPass / http://localhost:8080/
    ProxyPassReverse / http://localhost:8080/
    ProxyPass /ws/ ws://localhost:8080/ws/
    ProxyPassReverse /ws/ ws://localhost:8080/ws/
    ErrorLog logs/error_log-foobar
    CustomLog logs/access_log-foobar common
    LogLevel debug
</VirtualHost>

Initially, the user received a "403 Forbidden" response, which suggested an origin check issue. After disabling the origin check, the error shifted to a "400 Bad Request," indicating that the server was not receiving the upgrade request.

After gathering recommendations from numerous sources, the user arrived at a solution:

1. Trailing Slash: As Aralo pointed out, adding a trailing slash to the WebSocket path ("/ws/") was crucial. Apache appears to require a valid GET request for WebSocket handling.
2. ProxyPass Order: James Henstridge correctly noted that the order of ProxyPass directives is important. The ProxyPass for "/ws/" should precede the general "/".
3. Origin Check Removal: The go-websocket example code included an origin check in the ServeWs() function, which was removed.

Implementing these changes resolved the issue, and the user was able to successfully establish the websocket connection behind Apache's mod_proxy_wstunnel.

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