Table of Contents
Go WebSocket Client Connection Guide
Go WebSocket client connection code
Practical Case
Home Backend Development Golang How does the Go WebSocket client connect?

How does the Go WebSocket client connect?

Jun 01, 2024 am 10:57 AM
go

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 客户端如何连接?

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

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