Can I set listen URLs in appsettings.json in ASP.net Core 2.0 Preview?

Question

I'm creating an ASP.net Core 2.0 app to run on the .net Core 2.0 runtime, both currently in their Preview versions. However, I cannot figure out how to have Kestrel use something other than the default http://localhost:5000 listen URL.

Most documentation that I could Google talks about a server.urls setting, which seems to have been changed even in 1.0-preview to just be urls, however neither works (turning on Debug logging has Kestrel telling me that no listen endpoints are configured).

A lot of documentation also talks about a hosting.json and that I can't use the default appsettings.json. However, if I compare the recommended approach of loading a new config, this looks pretty much exactly like what the new WebHost.CreateDefaultBuilder method does, except that it loads appsettings.json.

I currently don't understand how appsettings.json and IConfigureOptions<T> are related, if at all, so it's possible that my trouble stems from a lack of understanding of what KestrelServerOptionsSetup actually does.

Answer 1

I got it working with this

public static IWebHost BuildWebHost(string[] args) => 
        WebHost.CreateDefaultBuilder(args)
            .UseConfiguration(new ConfigurationBuilder()
                .SetBasePath(Directory.GetCurrentDirectory())
                .AddJsonFile("hosting.json", optional: true)
                .Build()
            )
            .UseStartup<Startup>()
            .Build();

And the hosting.json

{ "urls": "http://*:5005;" }