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WebSocket application practice guide under the Flask framework

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Sep 29, 2023 am 10:06 AM

Practical Guideflask frameworkwebsocket application

WebSocket application practice guide under the Flask framework

WebSocket Application Practice Guide under the Flask Framework

Abstract: WebSocket is a protocol for real-time two-way communication that can be established between a browser and a server Persistent connections. When using the Flask framework to develop web applications, combined with WebSocket, real-time data updates, instant messaging and other functions can be achieved. This article will introduce how to use WebSocket under the Flask framework and provide code examples.

Introduction:
With the development of the Internet, real-time requirements are getting higher and higher, and the traditional HTTP request-response model is no longer able to meet this demand. In the past, in order to achieve real-time communication, long polling or short polling was often used. But this method is inefficient and wastes bandwidth. The emergence of the WebSocket protocol solves this problem, allowing a persistent full-duplex connection to be established between the browser and the server to achieve real-time communication.

1. Introduction to WebSocket principle:
WebSocket protocol is a protocol based on TCP, which can establish a two-way communication channel between the browser and the server. The traditional HTTP protocol is a "request-response" model, that is, the client sends a request to the server, and the server processes the request after receiving it and returns a response to the client. The WebSocket protocol can directly establish a persistent two-way connection between the client and the server. Clients and servers can perform real-time data transfers over this connection without waiting for the same performance overhead as HTTP requests.

2. Flask integrates WebSocket:
Under the Flask framework, WebSocket support can be achieved through the Flask-SocketIO plug-in. Flask-SocketIO is an extension of the Flask framework that provides WebSocket functionality. Below are the steps to integrate WebSocket.

Install Flask-SocketIO
Install Flask-SockeIO through the pip command:
```
pip install flask-socketio
```

Import Flask-SocketIO and create an application object

from flask import Flask
from flask_socketio import SocketIO

app = Flask(__name__)
socketio = SocketIO(app)

Define the method of receiving WebSocket messages

@socketio.on('message')
def handle_message(message):
 print('received message: ' + message)

Define the method of sending WebSocket messages

def send_message(message):
 socketio.emit('message', message)

Start Application

if __name__ == '__main__':
 socketio.run(app)

3. WebSocket application example:
The following is a simple chat room example to demonstrate how to use WebSocket to implement real-time chat function.

from flask import Flask, render_template
from flask_socketio import SocketIO

app = Flask(__name__)
app.config['SECRET_KEY'] = 'secret!'
socketio = SocketIO(app)

@app.route('/')
def index():
    return render_template('index.html')

@socketio.on('message')
def handle_message(message):
    socketio.emit('message', message)

if __name__ == '__main__':
    socketio.run(app)

In index.html, you can interact with the server through JavaScript code to realize the real-time chat function.

<!DOCTYPE html>
<html>
    <head>
        <title>Flask Websocket Chat</title>
        <script src="//cdnjs.cloudflare.com/ajax/libs/socket.io/1.3.6/socket.io.min.js"></script>
        <script>
            var socket = io.connect('http://' + document.domain + ':' + location.port);

            socket.on('connect', function() {
                socket.send('User has connected!');
            });

            socket.on('message', function(data) {
                var new_message = document.createElement('div');
                new_message.innerHTML = data;
                document.querySelector('#messages').appendChild(new_message);
            });

            function sendMessage() {
                var message = document.querySelector('#message_input').value;
                socket.send(message);
            }
        </script>
    </head>
    <body>
        <h1 id="Flask-Websocket-Chat">Flask Websocket Chat</h1>
        <div id="messages"></div>
        <input type="text" id="message_input">
        <button onclick="sendMessage()">Send</button>
    </body>
</html>

By running the above code, you can implement a simple WebSocket chat room.

Conclusion:
This article introduces how to integrate WebSocket under the Flask framework and provides a simple chat room example. Through the Flask-SocketIO plug-in, WebSocket can be easily used to implement real-time communication functions. When developing Web applications, combining WebSocket can improve user experience and achieve real-time data updates, instant messaging and other functions. I hope this article will help you use WebSocket under the Flask framework.

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