Configure support for Open API and Swagger UI

_init

dotnet add package ServiceStack.Api.OpenApi

Configure.OpenApi.cs

using ServiceStack;
using ServiceStack.Api.OpenApi;

[assembly: HostingStartup(typeof(MyApp.ConfigureOpenApi))]

namespace MyApp;

public class ConfigureOpenApi : IHostingStartup
{
    public void Configure(IWebHostBuilder builder) => builder
        .ConfigureServices(services => {
            services.AddPlugin(new OpenApiFeature());
        });
}