implementing Nginx reverse proxy setup for WebSocket connections on Ubuntu 22.04
I'm having trouble with I'm having trouble configuring Nginx as a reverse proxy for a WebSocket service running on an Ubuntu 22.04 server. My setup involves a Node.js application that serves WebSocket connections, but clients are unable to establish a connection through Nginx. The WebSocket URL is `ws://mydomain.com/socket`, and I have set up Nginx to listen on port 80 and forward WebSocket traffic appropriately. Here's my current Nginx configuration: ```nginx server { listen 80; server_name mydomain.com; location /socket { proxy_pass http://localhost:3000/socket; proxy_http_version 1.1; proxy_set_header Upgrade $http_upgrade; proxy_set_header Connection "upgrade"; proxy_set_header Host $host; proxy_set_header X-Real-IP $remote_addr; proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; proxy_set_header X-Forwarded-Proto $scheme; } } ``` When I try to connect using the client, I see this behavior in the browser's console: `WebSocket connection to 'ws://mydomain.com/socket' failed: behavior during WebSocket handshake: Unexpected response code: 400`. I have verified that my Node.js server is correctly set up and can serve WebSocket connections when accessed directly via `http://localhost:3000/socket`. I've tried modifying the `proxy_pass` directive and ensuring that the WebSocket headers are set correctly, but the scenario continues. I also checked the Nginx behavior logs and found the following entry: `2023/10/10 12:34:56 [behavior] 12345#0: *1 invalid HTTP method in request while reading client request headers`. It seems like the WebSocket handshake isn't being processed correctly. Is there something I'm missing in the Nginx configuration or a common pitfall with WebSocket proxying that I should look into? What would be the recommended way to handle this?