【socket.io跨域】关于socket.io nginx跨域问题

服务端: node.js 

前端环境: uni-app

需要依赖: vue-socket.io  socket.io-client

// main.js
import VueSocketio from 'vue-socket.io'
import socketio from 'socket.io-client';

Vue.use(new VueSocketio({
  debug: true,
  connection: socketio('http://真实线上地址:3300')
}))

nginx配置 nginx.conf

server {
  location /socket.io/ {
    proxy_pass http://127.0.0.1:3300/;    
    proxy_http_version 1.1;
    proxy_set_header Upgrade $http_upgrade;
  }
}

原因: 会自动添加/socket.io前缀