先看异常

Failed to connect socket (possibly due to failed `beforeConnect` on server) Error: Invalid namespace

项目是前后端分离
我使用的是sails框架，前端页面前端使用sails.io.js

sails使用pm2起了多个实例，然后使用nginx做反向代理，配置如下

upstream test-node {
    server 127.0.0.1:31011;
}

server {
    listen       80;
    server_name  xxx.yyy.com;
    charset utf-8;

    location /proj/  {
        proxy_pass http://test-node/;
        proxy_set_header X-Real-IP  $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection "upgrade";
    }
}

到了前端页面，代码如下

import sailsIO from 'sails.io.js'
import socketIOClient from 'socket.io-client'

const io = sailsIO(socketIOClient)
io.sails.url = 'http://xxx.yyy.com/proj'
io.sails.path = '/proj/socket.io/'

结果报了上述异常，请问有人知道怎么解决么。是不是我的写法有问题

使用http://xxx.yyy.com/proj去访问sails的所有接口都是正常的。