WSS是Web Socket Secure的简称, 它是WebSocket的加密版本。WSS与WS类似于HTTPS和HTTP，不同之处在于是不同的通信协议，都运行在SSL（Secure Socket Layer，安全套接层）之上。

WebSocket协议和HTTP协议虽然不同，但是WebSocket协议的握手和HTTP是兼容的，它使用HTTP的Upgrade协议头将连接从HTTP连接升级到WebSocket连接。这个特性使得WebSocket应用程序可以很容易地应用到现有的基础设施

1 核心代码块

location /wss {  
 			
      proxy_http_version 1.1;  
      proxy_set_header Upgrade $http_upgrade;  
      proxy_set_header Connection "Upgrade";  
    } 

2 完整 nginx 配置

 # 后台接口服务
upstream zb_backendss {
    server localhost:8080       weight=10;

}
upstream zb_backendss_admin {
    server localhost:8083       weight=10;
}

server {

    listen       443 ssl;
    listen 80 ;
    server_name wuliu.test.com;
    ssl on;
    ssl_certificate  6447499_wuliu.test.com.pem;   
    ssl_certificate_key 6447499_wuliu.test.com.key;
    ssl_session_timeout  300m;   
    ssl_ciphers ECDHE-RSA-AES128-GCM-SHA256:ECDHE:ECDH:AES:HIGH:!NULL:!aNULL:!MD5:!ADH:!RC4;
    ssl_protocols TLSv1 TLSv1.1 TLSv1.2;   
    ssl_prefer_server_ciphers   on; 

    location /Z9Mjp4uAGR.txt {
        alias   /opt/learncoal-webapps/web-admin-toupiao/le/Z9Mjp4uAGR.txt;

              }

    location /demo/wx {
                proxy_pass http://zb_backendss;
                proxy_set_header Host               $host;
                proxy_set_header X-Real-IP          $remote_addr;
                proxy_set_header X-Forwarded-For    $proxy_add_x_forwarded_for;

                 }
    location /demo/imserver {
                proxy_pass http://zb_backendss;
                proxy_set_header Host               $host;
                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";  
        }
      location /demo/admin {
                proxy_pass http://zb_backendss_admin;
                proxy_set_header Host               $host;
                proxy_set_header X-Real-IP          $remote_addr;
                proxy_set_header X-Forwarded-For    $proxy_add_x_forwarded_for;
                }
 
      location /admin-api/storage {
                rewrite ^/admin-api/storage/(.*)$ /$1 break;
                root /opt/ershoutushou/api/dts/storage;               
               }

     location / {
                 root   /opt/learncoal-webapps/web-admin-wuliu/dist;
                  index index.html index.htm;
                }

}

3 在微信小程序中直接使用访问

wss://wuliu.test.com/wss