Go WebSocket は他のプロトコルとどのように連携しますか?

import (
    "fmt"
    "log"
    "net/http"

    "github.com/gorilla/websocket"
)

const (
    port = ":8080"
)

var upgrader = websocket.Upgrader{
    ReadBufferSize:  1024,
    WriteBufferSize: 1024,
}

func main() {
    http.HandleFunc("/", indexHandler)
    http.HandleFunc("/ws", websocketHandler)

    log.Printf("Listening on port %s", port)
    if err := http.ListenAndServe(port, nil); err != nil {
        log.Fatal(err)
    }
}

func indexHandler(w http.ResponseWriter, r *http.Request) {
    fmt.Fprintf(w, "Welcome to the WebSocket page.")
}

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

    for {
        mt, message, err := conn.ReadMessage()
        if err != nil {
            log.Println(err)
            conn.Close()
            break
        }

        if err := conn.WriteMessage(mt, message); err != nil {
            log.Println(err)
            conn.Close()
            break
        }
    }
}