所以我试图使用flask-socket.io构建一个基本的聊天应用程序，但是遇到一些奇怪的错误。
服务器
from flask import Flask, render_template
from flask_socketio import SocketIO
app = Flask(__name__)
app.config['SECRET_KEY'] = 'vnkdjnfjknfl1232#'
socketio = SocketIO(app, cors_allowed_origins="*")
@app.route('/')
def sessions():
return render_template('session.html')
def messageReceived(methods=['GET', 'POST']):
print('message was received!!!')
@socketio.on('my event')
def handle_my_custom_event(json, methods=['GET', 'POST']):
print('received my event: ' + str(json))
socketio.emit('my response', json, callback=messageReceived)
if __name__ == '__main__':
socketio.run(app, debug=True, port=5002)
Session.html
<!DOCTYPE html>
<html lang="en">
<head>
<title>Flask_Chat_App</title>
</head>
<body>
<h3 style='color: #ccc;font-size: 30px;'>No message yet..</h3>
<div class="message_holder"></div>
<form action="" method="POST">
<input type="text" class="username" placeholder="User Name"/>
<input type="text" class="message" placeholder="Messages"/>
<input type="submit"/>
</form>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/socket.io/1.7.3/socket.io.min.js"></script>
<script type="text/javascript">
var socket = io.connect('http://' + document.domain + ':' + location.port);
socket.on( 'connect', function() {
socket.emit( 'my event', {
data: 'User Connected'
} )
var form = $( 'form' ).on( 'submit', function( e ) {
e.preventDefault()
let user_name = $( 'input.username' ).val()
let user_input = $( 'input.message' ).val()
socket.emit( 'my event', {
user_name : user_name,
message : user_input
} )
$( 'input.message' ).val( '' ).focus()
} )
} )
socket.on( 'my response', function( msg ) {
console.log( msg )
if( typeof msg.user_name !== 'undefined' ) {
$( 'h3' ).remove()
$( 'div.message_holder' ).append( '<div><b style="color: #000">'+msg.user_name+'</b> '+msg.message+'</div>' )
}
})
</script>
</body>
</html>
当我从http://localhost:5002/访问它时，该应用程序运行良好，但是如果我在本地加载html文件，则会出现此错误
Access to XMLHttpRequest at 'https://socket.io/?EIO=3&transport=polling&t=MyIHMvN' (redirected from 'http://socket.io/?EIO=3&transport=polling&t=MyIHMvN') from origin 'null' has been blocked by CORS policy: The value of the 'Access-Control-Allow-Origin' header in the response must not be the wildcard '*' when the request's credentials mode is 'include'. The credentials mode of requests initiated by the XMLHttpRequest is controlled by the withCredentials attribute.
我尝试按照其他地方的建议将cors_allowed_origins = []和cors_allowed_origins =“ *”添加到服务器，但是它没有任何改变。奇怪的是，它可以在Internet Explorer中工作，但不能在chrome中工作。
我也尝试添加CORS（app，resources = {r“ / ”：{“ origins”：“”}}）]
任何人都有处理此类问题的经验吗？
很快，
我们具有用于运行Chrome浏览器的“禁用网络安全”命令行选项...
--disable-web-security
此外，我们可以在服务API的服务器上启用CORS ...
Access-Control-Allow-Origin: *