我在我的 Mac 上安装了多次 Flask-socketio，仔细阅读说明并安装要求（eventlet/gevent）。虽然当我运行我的简单代码进行测试时，它要么说我没有导入模块，要么什么都不显示，直到我在浏览器中打开 index.html 然后显示：
The client is using an unsupported version of the Socket.IO or Engine.IO protocols (further occurrences of this error will be logged with level INFO)
这是我的 app.py 代码：
from flask import Flask
from flask_socketio import SocketIO, send
app = Flask(__name__)
app.config['SECRET_KEY'] = 'hello'
socketio = SocketIO(app, cors_allowed_origins='*')
@socketio.on('message')
def handle(msg):
print("message: "+msg)
send(msg, bradcast=True)
if __name__ == '__main__':
socketio.run(app)
这是我的终端窗口：
这是我的 index.html 代码（如果需要）：
<html>
<head>
<title>Chat Room</title>
<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/socket.io/1.4.8/socket.io.min.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.2.4/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() {
socket.send('User has connected!');
});
socket.on('message', function(msg) {
$("#messages").append('<li>'+msg+'</li>');
console.log('Received message');
});
$('#sendbutton').on('click', function() {
socket.send($('#myMessage').val());
$('#myMessage').val('');
});
});
</script>
<ul id="messages"></ul>
<input type="text" id="myMessage">
<button id="sendbutton">Send</button>
</body>
</html>
谢谢您的帮助