https://www.cnblogs.com/chenyishi/p/14090890.html
$server_port :nigix監聽的端口
$proxy_port : 服務器真正訪問的端口
#設置請求頭"Host"值(為入口域名和端口)
proxy_set_header Host $http_host;
#設置為upstream對應服務器(IP和端口)
proxy_set_header Host $proxy_host;
#設置為入口Host和當前nginx監聽端口
proxy_set_header Host $host:$server_port;
#默認
proxy_set_header Host $proxy_host;#schemaproxy_set_header X-Forwarded-Proto $scheme;