using Microsoft.AspNetCore.Http.HttpResults;
var builder = WebApplication.CreateBuilder(args); builder.Services.AddProblemDetails(); var app = builder.Build();
app.MapGet("/items/{id:int}", Results<Ok<Item>, NotFound, ProblemHttpResult> (int id) => {
    if (id <= 0) return TypedResults.Problem(statusCode: 400, title: "Identifier must be positive");
    return id == 1 ? TypedResults.Ok(new Item(1, "rune")) : TypedResults.NotFound();
});
app.Run();
public sealed record Item(int Id, string Name);