How have you worked with WebSocket? At what level - infrastructure setup or just code? What technologies did you use? Were there connection issues at the infrastructure level?

I worked with WebSocket both at the code level and in infrastructure setup.

At the code level, I used Golang with libraries like Gorilla WebSocket to implement the server side, handling client connections, messages, and disconnections.

In infrastructure, we configured load balancers (such as Nginx or HAProxy) with WebSocket support to correctly proxy connections. We also used Kubernetes with Ingress controllers that support WebSocket.

Connection issues arose due to timeouts on load balancers and proxies, as well as firewall restrictions. To resolve these, we implemented heartbeat messages (ping/pong), configured timeouts, and checked the correctness of SSL termination.

Overall, successful WebSocket operation requires coordinated configuration of both code and infrastructure.