Why doesn't my asp.net application listen to https://localhost:5001?

Question

I'm developing a web api, but when I run it with dotnet on Ubuntu18.04, it only listens on http://localhost:5000. I'm using nginx as a reverse proxy and to redirect http to https, but I think that the problem is with kestrel.

Answer 1

Say you want to listen port 5020

 var host = new WebHostBuilder()
        .UseKestrel()
         :
        .UseUrls("http://localhost:5020/")
        .Build();
    host.Run();