websocket 请求经过 nginx 后，可能会不正常，需要如下配置，相关的头才可以

    1. map $http_upgrade $connection_upgrade {
    3.   default upgrade;
    4.   '' close;
    5. }
    6. server {
    8.   listen 80;
    9.   server_name 192.168.1.1;
    10.   charset utf-8;
    11.   location /stomp/ {
    12.     proxy_pass http://192.168.7.2:9541;
    13.     # client_max_body_size 500M;
    14.     proxy_http_version 1.1;
    15.     proxy_set_header Upgrade $http_upgrade;
    16.     proxy_set_header Connection $connection_upgrade;
    17.   }
    18. }