Nginx配置websocket转发

        nginx默认不会为客户端转发 Upgrade、Connection 请求Header，为了让被代理的后端服务器知道客户端要升级协议，要在nginx上显式转发：

location ^~/url/ {
    proxy_pass http://serverIp:serverPort/; #修改此地址为后台服务地址
    proxy_set_header X-Forwarded-Proto $scheme;
    proxy_set_header Host $host:$server_port;
    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";
    proxy_connect_timeout   1;
    proxy_buffering off;
    chunked_transfer_encoding off;
    proxy_cache off;
    proxy_send_timeout      30m;
    proxy_read_timeout      30m;
    client_max_body_size    100m;
}