Nginx配置WebSocket

1）原理

2）nginx配置

http {
    include       mime.types;
    default_type  application/octet-stream;
	
	# 如果 $http_upgrade 不为 '' (空)，则 $connection_upgrade 为 upgrade 。
    # 如果 $http_upgrade 为 '' (空)，则 $connection_upgrade 为 close。
	map $http_upgrade $connection_upgrade{
		default upgrade;
		'' close;
	}

	upstream webservers{
	  server 127.0.0.1:8080 weight=90 ;
	}

    server {
        listen       80;
        server_name  localhost;
        
		# WebSocket
		location /ws/ {
            proxy_pass   http://webservers/ws/;
			proxy_http_version 1.1;
			proxy_set_header Upgrade $http_upgrade;
			proxy_set_header Connection "$connection_upgrade";
        }
    }
}