WebSockets with `gorilla/websocket`

Real‑time Communication

This lesson explains the main concept clearly with beginner-friendly examples and background so you can learn why the code works.

Add WebSocket support using the popular gorilla/websocket library.

$ go get github.com/gorilla/websocket

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

var upgrader = websocket.Upgrader{ // allow any origin for demo
    CheckOrigin: func(r *http.Request) bool { return true },
}

func wsHandler(w http.ResponseWriter, r *http.Request) {
    conn, err := upgrader.Upgrade(w, r, nil)
    if err != nil { log.Print("upgrade error:", err); return }
    defer conn.Close()
    for {
        mt, msg, err := conn.ReadMessage()
        if err != nil { log.Println("read error:", err); break }
        // Echo back the same message
        if err = conn.WriteMessage(mt, msg); err != nil { log.Println("write error:", err); break }
    }
}

Register:

http.HandleFunc("/ws", wsHandler)