server {
	listen 80;
	server_name a.com;

	location / {
		proxy_pass  http://localhost:8443;
		proxy_redirect off;
		proxy_set_header Host $host:$server_port;
		# 这两个HTTP头是因为采用了nginx作为代理后，后端可以通过 X-real-ip 或 X-Forwarded-For取得用户IP地址
		proxy_set_header X-Real-IP $remote_addr;
		proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
		proxy_set_header X-Forwarded-Proto $scheme;
		proxy_set_header X-Forwarded-Port $server_port;
	}
}

server {
	listen 80;
	server_name b.com;

	location / {
		proxy_pass  http://localhost:8085;
		proxy_redirect off;
		proxy_set_header Host $host:$server_port;
		# 这两个HTTP头是因为采用了nginx作为代理后，后端可以通过 X-real-ip 或 X-Forwarded-For取得用户IP地址
		proxy_set_header X-Real-IP $remote_addr;
		proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;

		proxy_set_header X-Forwarded-Proto $scheme;
		proxy_set_header X-Forwarded-Port $server_port;

		# websocket相关
		proxy_connect_timeout 4s; 
		proxy_read_timeout 7200s; 
		proxy_send_timeout 12s; 
		proxy_http_version 1.1;
		proxy_set_header Upgrade $http_upgrade;
		proxy_set_header Connection $connection_upgrade;
	}
}