What main difficulties did you encounter when using WebSocket in projects?

The main challenges when using WebSocket in Go projects are usually related to:

• Connection state management: WebSocket is a persistent bidirectional connection, and it is necessary to properly handle disconnections, reconnections, and timeouts.
• Scaling: with a large number of clients, it is important to efficiently distribute the load, for example, by using message brokers or clustering.
• Security: it is necessary to consider protection against DoS attacks, user authentication, and authorization.
• Error and exception handling: errors in data transmission or unexpected connection closures require careful handling.

An example of a simple WebSocket server in Go using the Gorilla WebSocket library:

import (
    "net/http"
    "github.com/gorilla/websocket"
)

var upgrader = websocket.Upgrader{}

func wsHandler(w http.ResponseWriter, r *http.Request) {
    conn, err := upgrader.Upgrade(w, r, nil)
    if err != nil {
        return
    }
    defer conn.Close()

    for {
        messageType, message, err := conn.ReadMessage()
        if err != nil {
            break
        }
        err = conn.WriteMessage(messageType, message)
        if err != nil {
            break
        }
    }
}

func main() {
    http.HandleFunc("/ws", wsHandler)
    http.ListenAndServe(":8080", nil)
}