Apache 2.4 mod_proxy Not Handling WebSocket Connections Properly
I've been working on this all day and I'm refactoring my project and I am trying to set up a reverse proxy using Apache 2.4 to handle WebSocket connections to a Node.js server running on port 3000. I have configured the proxy settings in my Apache virtual host file, but the WebSocket connections are not being established correctly. Instead of upgrading to a WebSocket, the connection falls back to regular HTTP, leading to errors in the client console like `WebSocket connection to 'ws://example.com/socket' failed: behavior during WebSocket handshake: Unexpected response code: 400`. Here is the configuration I am using in my `httpd.conf`: ```apache <VirtualHost *:80> ServerName example.com ProxyPass /socket ws://localhost:3000/socket ProxyPassReverse /socket ws://localhost:3000/socket ProxyPass / http://localhost:3000/ ProxyPassReverse / http://localhost:3000/ ErrorLog ${APACHE_LOG_DIR}/behavior.log CustomLog ${APACHE_LOG_DIR}/access.log combined </VirtualHost> ``` I have also made sure to include the necessary modules by ensuring that `mod_proxy`, `mod_proxy_http`, and `mod_proxy_wstunnel` are loaded. I confirmed this by checking the output of `apachectl -M` which shows that `proxy` and `proxy_wstunnel` are enabled. Additionally, I attempted to set up a separate VirtualHost for SSL, but I’m working with the same scenario when trying to connect through `wss://`. I've added the following for my SSL configuration: ```apache <VirtualHost *:443> ServerName example.com SSLEngine on SSLCertificateFile /path/to/cert.pem SSLCertificateKeyFile /path/to/key.pem ProxyPass /socket ws://localhost:3000/socket ProxyPassReverse /socket ws://localhost:3000/socket ProxyPass / http://localhost:3000/ ProxyPassReverse / http://localhost:3000/ ErrorLog ${APACHE_LOG_DIR}/error_ssl.log CustomLog ${APACHE_LOG_DIR}/access_ssl.log combined </VirtualHost> ``` I’ve verified that the Node.js server is running and accessible directly via `http://localhost:3000/socket`, and I can establish WebSocket connections to it without Apache. I've tried adding `ProxyPreserveHost On` and adjusting the `ProxyPass` directives, but those changes didn’t resolve the scenario. What could be causing the WebSocket handshake to unexpected result, and how can I diagnose or fix this question? What's the best practice here? I'm working with Apache in a Docker container on macOS. Any help would be greatly appreciated!