配置map --http 模块

 map $http_upgrade $connection_upgrade {
    default upgrade;
    ''   close;
  }

最重要的就是在反向代理的配置中增加了如下两行，其它的部分和普通的HTTP反向代理没有任何差别。

proxy_set_header Upgrade $http_upgrade;
proxy_set_header Connection $connection_upgrade;

测试方法

npm install -g wscat 

wscat -c ws://echo.websocket.org
wscat -c localhost:$port/xxx/xxx

参考 [https://www.nginx.com/blog/websocket-nginx/]

http {
    map $http_upgrade $connection_upgrade {
        default upgrade;
        '' close;
    }
 
    upstream websocket {
        server 192.168.100.10:8010;
    }
 
    server {
        listen 8020;
        location / {
            proxy_pass http://websocket;
            proxy_http_version 1.1;
            proxy_set_header Upgrade $http_upgrade;
            proxy_set_header Connection $connection_upgrade;
            proxy_set_header Host $host;
        }
    }
}