Kestrel 不支持基于主机名的绑定，如果1台服务器部署了多个 ASP.NET Core 站点，每个站点需要使用不同的端口

详见 Kestrel web server implementation in ASP.NET Core：

A reverse proxy scenario exists when there are multiple apps that share the same IP and port running on a single server. Kestrel doesn't support this scenario because Kestrel doesn't support sharing the same IP and port among multiple processes. When Kestrel is configured to listen on a port, Kestrel handles all of the traffic for that port regardless of requests' host header. A reverse proxy that can share ports has the ability to forward requests to Kestrel on a unique IP and port.