Golang 建立WebSocket與HTTP server

Go建立WebSocket與HTTP server。

範例環境：

• Go 1.19

範例

參考「Golang 建立網頁伺服器 Web Server」及「Golang WebSocket hello world」，WebSocket和HTTP server共用同個port。

main.go

package main

import (
    "fmt"
    "net/http"

    "github.com/gorilla/websocket"
)

var upgrader = websocket.Upgrader{
    CheckOrigin: func(r *http.Request) bool {
        return true // allow CORS request's Origin header
    },
}

func main() {
    http.HandleFunc("/echo", echoHandler)   // websocket endpoint
    http.HandleFunc("/hello", helloHandler) // http endpoint

    http.ListenAndServe(":8080", nil)
}

func echoHandler(w http.ResponseWriter, r *http.Request) {
    conn, err := upgrader.Upgrade(w, r, nil)
    if err != nil {
        panic(err)
    }
    defer conn.Close()
    for {
        mt, message, err := conn.ReadMessage()
        if err != nil {
            panic(err)
        }

        fmt.Printf("receive: %s", message)
        err = conn.WriteMessage(mt, message)
        if err != nil {
            panic(err)
        }
    }
}

func helloHandler(w http.ResponseWriter, r *http.Request) {
    name := r.URL.Query().Get("name")
    content := fmt.Sprintf("hello, %s", name)
    fmt.Fprint(w, content)
}

github。