Flask 服务器的 400 Bad Request 错误为 socketio 反应客户端

Question

正在尝试在 flask 服务器和 reactjs 客户端之间创建 socketio link。它显示此错误

"Access to XMLHttpRequest at 'http://127.0.0.1:5000/socket.io/?EIO=3&transport=polling&t=MrcruFC' from origin 'http://localhost:3000' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource."

我已经尝试从 flask cors 文档中包含 CORS，但它仍然不起作用。

服务器：

from flask import Flask, Response
from flask_cors import CORS
from flask_socketio import SocketIO

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


@socketio.on('connection')
def handle_my_custom_event():
    socket.emit('outgoing data',{num: '10'})

@app.route("/")
def hello():
    return 'Hello'

if __name__ == '__main__':
    socketio.run(app, host='0.0.0.0', port=5000)

Answer 1

您可以使用以下 headers 允许 CORS：

header = response.headers
header['Access-Control-Allow-Origin'] = '*'

Answer 2

您可以添加用于创建 SocketIO 的选项。

socketio = SocketIO(app=app, cors_allowed_origins='*')

Flask 服务器的 400 Bad Request 错误为 socketio 反应客户端

400 Bad Request error with flask server react client for socketio

reactjs

flask

socket.io

flask-cors