Flask 套接字 IO ValueError

Question

我的运行我的代码出现以下错误：

"ValueError: View function did not return a response"

以下是我的 Flask 代码：

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

app = Flask(__name__)
app.config['Secret_Key'] = 'mysecret'
socketio = SocketIO(app)

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

@socketio.on('message')
def handleMessage(msg):
    print ('Message:' + msg)
    send (msg, broadcast = True)

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

以下是我的 index.html 代码：

<html>
<head>
<title>Chat Room</title>
<script type= "text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/socket.io/1.7.4/socket.io.js"> </script>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"> </script>
</head>
<body>
<script type= "text/javascript">
$(document).ready(function() {

    var socket = io.connect('http://127.0.0.1:5000');

    socket.on('connect',function() {
      send.send('User has connected!');
    });
    socket.on('message', function(msg) {
      $("#messages").append('<li>'+msg+'</li>')
    });

      $('#sendbutton').on('click',function() {
        socket.send($('#myMessage').val());
        $('#myMessage').val('');
    });
});
</script>
<ul id= "messages"> </ul>
<input type="text" id="myMessage">
<button id="sendbutton">Send</button>
</body>
</html>

当我通过浏览器打开 localhost:5000 时出现以下错误：

Internal Server Error

The server encountered an internal error and was unable to complete your request. Either the server is overloaded or there is an error in the application.

Answer 1

问题出在这里：

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

您应该 return 呈现的模板，更改为：

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

其他功能可能有同样的问题。

Flask 套接字 IO ValueError

Flask Socket IO ValueError

python

sockets

flask

socket.io

flask-socketio