Equivalent of UseUrls for .NET Core 3.1/IHostBuilder
The method ConfigureWebHostDefaults allows you to configure the web host. One of the thing you can do is change the urls: https://learn.microsoft.com/en-us/aspnet/core/fundamentals/host/generic-host?view=aspnetcore-3.1#urls public static IHostBuilder CreateHostBuilder(string[] args) => Host.CreateDefaultBuilder(args) .ConfigureWebHostDefaults(webBuilder => { webBuilder.UseStartup<Startup>(); webBuilder.UseUrls(“http://localhost:5100”); });