Integrating WebSocket into Flask and FastAPI

WebSocket is a powerful technology for establishing bidirectional real-time communication channels between servers and clients. Below is a guide on how to integrate WebSocket into two popular frameworks, Flask and FastAPI.

Integrating WebSocket into Flask

Step 1: Install Libraries

Firstly, you need to install the flask and flask-socketio libraries using the following command:

pip install Flask flask-socketio

Step 2: Set Up the Application

Here's an example of how to integrate WebSocket into a Flask application:

from flask import Flask, render_template
from flask_socketio import SocketIO, emit

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

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

@socketio.on('message')
def handle_message(message):
    emit('response', {'data': message})

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

In the code snippet above, we use the flask-socketio library to create a WebSocket server. The handle_message function is called when a client sends a message, and the server responds by emitting a response event.

Integrating WebSocket into FastAPI

Step 1: Install Libraries

Install the fastapi and uvicorn libraries using the following command:

pip install fastapi uvicorn

Step 2: Set Up the Application

Here's an example of how to integrate WebSocket into a FastAPI application:

from fastapi import FastAPI, WebSocket
from fastapi.responses import HTMLResponse

app = FastAPI()

@app.get('/')
def get():
    return HTMLResponse(content=open("index.html").read())

@app.websocket("/ws")
async def websocket_endpoint(websocket: WebSocket):
    await websocket.accept()
    while True:
        data = await websocket.receive_text()
        await websocket.send_text(f"Server received: {data}")

In the code snippet above, we use FastAPI to create a WebSocket server. The websocket_endpoint function accepts WebSocket connections, listens for data sent by clients, and responds by sending data back to the client.

Conclusion

Integrating WebSocket into popular frameworks like Flask and FastAPI opens up possibilities for creating real-time applications and bidirectional communication between servers and clients.

Integrating WebSocket into Flask and FastAPI