在Windows本地运行socket正常，但是部署到ubuntu服务器上报400 bad request的错误。

[xingyezn]

请确保提供下面的信息：

• 如果和代码相关，给出相关代码
• 如果时执行命令出错，给出完整的命令和输出信息
• 如果有报错，给出完整的报错信息（文本形式）
• 如果和书相关，给出相关页数/程序/代码片段编号等信息
• 给出使用的操作系统、Python 版本、Flask 版本
• 其他必要的相关信息
  JS：
  const socket = io();
  socket.on('user count', function (data) {
  console.log('js登录', data.user_name);
  $('#online_count').html(data.count);
  });
  Python：
  online_users = []

@socketio.on('connect')
def connect():
global online_users
user_id = session.get('user_id')
one_user = User.query.get(user_id)
if user_id not in online_users:
online_users.append(user_id)
print('connect登录', len(online_users), one_user.user_name)
emit('user count', {'count': len(online_users), 'user_name': one_user.user_name, 'connect_is': 0}, broadcast=True)

@socketio.on('disconnect')
def disconnect():
global online_users
user_id = session.get('user_id')
one_user = User.query.get(user_id)
if user_id in online_users:
online_users.remove(user_id)
print('disconnect退出', len(online_users), one_user.user_name)
emit('user count', {'count': len(online_users), 'user_name': one_user.user_name, 'connect_is': 0}, broadcast=True)

前端报错：
polling-xhr.js:264 GET http://xingyezn.cn/socket.io/?EIO=3&transport=polling&t=NK7PRDj&sid=b6cca4b760404bd9b48aec1a61aec1b8 400 (BAD REQUEST)
后端报错：
[pid: 14861|app: 0|req: 5/45] 180.160.58.153 () {34 vars in 772 bytes} [Thu Oct 8 16:47:55 2020] GET /socket.io/?EIO=3&transport=polling&t=NK7PJRn => generated 187 bytes in 6 msecs (HTTP/1.1 200) 3 headers in 170 bytes (1 switches on core 0)
[pid: 14860|app: 0|req: 10/46] 180.160.58.153 () {34 vars in 846 bytes} [Thu Oct 8 16:47:55 2020] GET /socket.io/?EIO=3&transport=polling&t=NK7PJSO&sid=829bf44f20824b9cabf44d1b19eb258c => generated 11 bytes in 0 msecs (HTTP/1.1 400) 2 headers in 94 bytes (1 switches on core 0)
[pid: 14857|app: 0|req: 9/47] 180.160.58.153 () {40 vars in 939 bytes} [Thu Oct 8 16:47:56 2020] POST /socket.io/?EIO=3&transport=polling&t=NK7PJhN&sid=829bf44f20824b9cabf44d1b19eb258c => generated 11 bytes in 0 msecs (HTTP/1.1 400) 3 headers in 143 bytes (1 switches on core 0)
[pid: 14859|app: 0|req: 9/48] 180.160.58.153 () {34 vars in 772 bytes} [Thu Oct 8 16:47:57 2020] GET /socket.io/?EIO=3&transport=polling&t=NK7PJx3 => generated 187 bytes in 3 msecs (HTTP/1.1 200) 3 headers in 170 bytes (1 switches on core 0)
[pid: 14860|app: 0|req: 11/49] 180.160.58.153 () {34 vars in 846 bytes} [Thu Oct 8 16:47:57 2020] GET /socket.io/?EIO=3&transport=polling&t=NK7PJxd&sid=7fd2c758d3174423a3755279c5db7b15 => generated 11 bytes in 0 msecs (HTTP/1.1 400) 2 headers in 94 bytes (1 switches on core 0)
[pid: 14857|app: 0|req: 10/50] 180.160.58.153 () {40 vars in 939 bytes} [Thu Oct 8 16:47:58 2020] POST /socket.io/?EIO=3&transport=polling&t=NK7PKAg&sid=7fd2c758d3174423a3755279c5db7b15 => generated 11 bytes in 0 msecs (HTTP/1.1 400) 3 headers in 143 bytes (1 switches on core 0)
[pid: 14858|app: 0|req: 7/51] 180.160.58.153 () {34 vars in 772 bytes} [Thu Oct 8 16:47:59 2020] GET /socket.io/?EIO=3&transport=polling&t=NK7PKQG => generated 187 bytes in 4 msecs (HTTP/1.1 200) 3 headers in 170 bytes (1 switches on core 0)
[pid: 14860|app: 0|req: 12/52] 180.160.58.153 () {34 vars in 846 bytes} [Thu Oct 8 16:47:59 2020] GET /socket.io/?EIO=3&transport=polling&t=NK7PKQo&sid=6ac96af010e9463d8934f08d8d9737dd => generated 11 bytes in 0 msecs (HTTP/1.1 400) 2 headers in 94 bytes (1 switches on core 0)
[pid: 14857|app: 0|req: 11/53] 180.160.58.153 () {40 vars in 939 bytes} [Thu Oct 8 16:48:00 2020] POST /socket.io/?EIO=3&transport=polling&t=NK7PKfp&sid=6ac96af010e9463d8934f08d8d9737dd => generated 11 bytes in 0 msecs (HTTP/1.1 400) 3 headers in 143 bytes (1 switches on core 0)
[pid: 14860|app: 0|req: 13/54] 180.160.58.153 () {34 vars in 772 bytes} [Thu Oct 8 16:48:01 2020] GET /socket.io/?EIO=3&transport=polling&t=NK7PKve => generated 187 bytes in 4 msecs (HTTP/1.1 200) 3 headers in 170 bytes (1 switches on core 0)
[pid: 14857|app: 0|req: 12/55] 180.160.58.153 () {34 vars in 846 bytes} [Thu Oct 8 16:48:01 2020] GET /socket.io/?EIO=3&transport=polling&t=NK7PKw9&sid=6612fd1e26e54f398fbe88a9835250d9 => generated 11 bytes in 0 msecs (HTTP/1.1 400) 2 headers in 94 bytes (1 switches on core 0)
[pid: 14861|app: 0|req: 6/56] 180.160.58.153 () {40 vars in 939 bytes} [Thu Oct 8 16:48:02 2020] POST /socket.io/?EIO=3&transport=polling&t=NK7PL9C&sid=6612fd1e26e54f398fbe88a9835250d9 => generated 11 bytes in 0 msecs (HTTP/1.1 400) 3 headers in 143 bytes (1 switches on core 0)

就是这样一直反复报错。不知道怎么解决。本地的时候也没有报错。

[7455488]

添加
transports: ["websocket", "polling"],
timeout: 5000,
///
const socket = io(connection, {
transports: ["websocket", "polling"],
timeout: 5000,
});

[xingyezn]

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