nginx中proxy_set_header Host proxy_host，http_host的区别
# 把发送给客户端的http 转为https
proxy_redirect http:// https://;
proxy_set_header Host $http_host;
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;