How does the Go WebSocket client connect?

Go WebSocket Client Connection Guide The following steps demonstrate how to use Go's gorilla/websocket package to establish a connection with a WebSocket server: Import the necessary libraries: Import the github.com/gorilla/websocket package and other necessary packages. Dial-up connection: Use the DefaultDialer.Dial function to connect to the server, providing the server URL. Sending a message: Use the WriteMessage function to send a message to the server. Read the message: Use the ReadMessage function to read the response message from the server.

Go WebSocket Client Connection Guide

WebSocket is a full-duplex communication protocol built on TCP, allowing two-way communication between the client and the server. When using WebSockets in Go, you need to connect to a server in order to communicate.

Go WebSocket client connection code

The following example demonstrates how to use Go's github.com/gorilla/websocket package to establish a WebSocket client connection:

package main

import (
    "fmt"
    "log"

    "github.com/gorilla/websocket"
)

func main() {
    url := "ws://localhost:8080/ws"
    conn, _, err := websocket.DefaultDialer.Dial(url, nil)
    if err != nil {
        log.Fatal("dial:", err)
    }
    defer conn.Close()
    if err := conn.WriteMessage(websocket.BinaryMessage, []byte("Hello WebSocket!")); err != nil {
        log.Println("write:", err)
    }
    msgType, msg, err := conn.ReadMessage()
    if err != nil {
        log.Println("read:", err)
    }
    fmt.Printf("Received: %s\n", string(msg))
}

Practical Case

Suppose you have the following scenario:

• You have a WebSocket server running on localhost:8080.
• You want to connect to this server from a Go client and send messages.

Then you can use the following code to establish a client connection:

conn, _, err := websocket.DefaultDialer.Dial("ws://localhost:8080/ws", nil)
if err != nil {
    log.Fatal("dial:", err)
}

If the connection is successful, you can send a message to the WebSocket server like the following:

if err := conn.WriteMessage(websocket.BinaryMessage, []byte("Hello WebSocket!")); err != nil {
    log.Println("write:", err)
}

Then , you can read the response message from the server:

msgType, msg, err := conn.ReadMessage()
if err != nil {
    log.Println("read:", err)
}

In the above example, websocket.BinaryMessage is used to send a binary message. You can use different message types according to your needs.

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