环境

Unraid: 6.8.2
Swag: 1.16.0
Jackett: v0.18.686

背景

1. 通过域名和port（非80或443）转发，从外网访问unraid上的服务。
2. Jackett转发配置用的swag里默认的nginx subdomain模板，仅修改了Server name。

问题

外网访问jackett (例如https://domain.com:7373/jackett/UI/Dashboard)时，url会被重定向到 https://domain.com/jackett/UI/Login?ReturnUrl=%2Fjackett%2FUI%2FDashboard，如此一来，原来的port被丢弃，转发失败。

解决

参考 https://github.com/Jackett/Jackett/issues/3643

1. 修改nginx配置里的proxy.conf，路径：swag的挂载目录\nginx\proxy.conf
   将proxy_set_header X-Forwarded-Host $host;改为proxy_set_header X-Forwarded-Host $http_host;
2. 重启Swag即可

原因

https://github.com/Jackett/Jackett/issues/3643#issuecomment-415342024

using $http_host is highly recommended and needed for the download links to be build correctly if your nginx is running on a non default HTTP (80)/HTTPS (443) port (The $host variable never contains the original port while $http_host does).