Websocket代理配置(ws、wss):
user  nginx;
worker_processes  auto;

error_log  /var/log/nginx/error.log notice;
pid        /var/run/nginx.pid;


events {
    worker_connections  1024;
}


http {
    include       /etc/nginx/mime.types;
    default_type  application/octet-stream;

    log_format  main  '$remote_addr - $remote_user [$time_local] "$request" '
                      '$status $body_bytes_sent "$http_referer" '
                      '"$http_user_agent" "$http_x_forwarded_for"';

    access_log  /var/log/nginx/access.log  main;

    sendfile        on;
    #tcp_nopush     on;
    keepalive_timeout  65;
    #gzip  on;
    include /etc/nginx/conf.d/*.conf;

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

    upstream websocket {
        server 172.20.2.1:58588;
    }

    server {
        listen 80;
        server_name 172.20.2.1;
	
		#首页index代理 http
   		location / {
      		root /var/www/sass-ui;
      		index index.html index.html;
    	}
	
		#websocket代理 ws
        location /socketurl {
            proxy_pass http://websocket;
            proxy_http_version 1.1;
            proxy_set_header Upgrade $http_upgrade;
            proxy_set_header Connection "connection_upgrade";
        }
   }

  server {
    listen   443 ssl;
    server_name  est.com;
    ssl_certificate    /opt/nginx/ssl/STAR_est_com.crt;
    ssl_certificate_key   /opt/nginx/ssl/STAR_est_com.key; 
    ssl_session_cache    shared:SSL:1m;
    ssl_session_timeout  10m;
    ssl_ciphers  HIGH:!aNULL:!MD5;
    ssl_prefer_server_ciphers  on;
    
    #首页index代理 https
    location / {
        root /var/www/sass-ui-out;
        index index.html;
    }
    
    #websocket代理 ws
    location /socketurl {
            proxy_pass http://websocket;
            proxy_http_version 1.1;
            proxy_set_header Upgrade $http_upgrade;
            proxy_set_header Connection "connection_upgrade";
    }
  }
}
wss协议:Wesocket + SSL ,就是Websocket协议加上SSL,类似于http和https(http + ssl)
map $http_upgrade $connection_upgrade {
	default upgrade;
	'' close;
}

upstream websocket {
	#58588:服务端口号
	server 172.20.2.1:58588;
}
http|https升级为websocket连接(ws|wss):
#代理websocket最重要配置,将http|https升级为websocket连接(ws|wss)
proxy_set_header Upgrade $http_upgrade;
proxy_set_header Connection "connection_upgrade";
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