How to send Go WebSocket messages?

In Go, you can use the gorilla/websocket package to send WebSocket messages. Specific steps: Establish a WebSocket connection. Send a text message: Call WriteMessage(websocket.TextMessage, []byte("message")). To send a binary message: call WriteMessage(websocket.BinaryMessage, []byte{1, 2, 3}).

#How to send Go WebSocket messages?

WebSocket is a high-level protocol for full-duplex communication over a single TCP connection. In Go, we can use the [gorilla/websocket](https://godoc.org/github.com/gorilla/websocket) package in the standard library to send WebSocket messages.

Send a text message

Here's how to send a text message:

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

    if err := ws.WriteMessage(websocket.TextMessage, []byte("Hello world!")); err != nil {
        log.Fatal(err)
    }
}

Send a binary message

To send a binary message, use websocket. BinaryMessage As the message type:

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

    if err := ws.WriteMessage(websocket.BinaryMessage, []byte{1, 2, 3}); err != nil {
        log.Fatal(err)
    }
}

Practical case: Chat room

In the chat room, the client sends messages through the WebSocket connection. Here is the client code:

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

    msg := "Hello from client!"
    if err := ws.WriteMessage(websocket.TextMessage, []byte(msg)); err != nil {
        log.Fatal(err)
    }
}

This will send a WebSocket message to the server containing the text message Hello from client!.

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