ASP.NET Core : DELETE route handler not working

Question

I am trying to learn how to create REST API using ASP.NET Core, and I've managed to create working GET and POST requests, but for some reason, the DELETE request is not working. What am I missing?

This is my delete route setup

app.MapDelete("/todo/{id}", Results<Ok, NotFound> ([FromRoute] int id, [FromServices] TodoDb db) =>
{
    var result = db.todos.Where<TodoModel>(model => model.id == id).First();

    if (result is null)
    {
        return TypedResults.NotFound();
    }

    db.todos.Remove(result);
    db.SaveChanges();

    return TypedResults.Ok();
});

When I send a DELETE request, I get this response:

HTTP/1.1 405 Method Not Allowed
Content-Length: 0
Connection: close
Date: Fri, 13 Dec 2024 04:46:32 GMT
Server: Kestrel
Allow: GET, POST

The URL is:

http://localhost:5168/todo?id=2

This is my program.cs:

using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Http.HttpResults;
using Microsoft.EntityFrameworkCore;
using Todo.Model;
using Todo.TodoDb;
using System.ComponentModel;
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Rewrite;


WebApplicationBuilder builder = WebApplication.CreateBuilder(args);

// add the data base connection
builder.Services.AddDbContext<TodoDb>(options => options.UseInMemoryDatabase("TodoList"));

//builder.Services.AddDatabaseDeveloperPageExceptionFilter();

WebApplication app = builder.Build();

//builder.Services.AddEndpointsApiExplorer();

// builder.Services.AddOpenApiDocument(config =>
// {
//     config.DocumentName = "TodoAPI";
//     config.Title = "TodoAPI v1";
//     config.Version = "v1";
// });

/// redirects to the todo
app.UseRewriter(new RewriteOptions().AddRedirect("tasks/(.*)", "todo/$1"));

// custom middler ware
app.Use((context, next) => next(context));

app.MapGet("/todo", Results<Ok<List<TodoModel>>, NotFound> ([FromServices] TodoDb db) =>
{
    List<TodoModel> result = db.todos.ToList();

    return result is null ?
    TypedResults.NotFound() :
    TypedResults.Ok<List<TodoModel>>(result);
});

app.MapGet("/todo/{id}", Results<Ok<TodoModel>, NotFound> ([FromRoute] int id, [FromServices] TodoDb db) =>
{
    TodoModel result = db.todos.Where<TodoModel>(model => model.id == id).First();

    Console.WriteLine(result);
    // await db.SaveChangesAsync();

    return result is null ?
        TypedResults.NotFound() : TypedResults.Ok(result);
});

app.MapPost("/todo", Results<Ok<TodoModel>, NotFound> ([FromBody] TodoModel todo, [FromServices] TodoDb db) =>
{
    db.todos.Add(todo);
    db.SaveChanges();

    return TypedResults.Ok<TodoModel>(todo);
});

app.MapDelete("/todo/{id}", Results<Ok, NotFound> ([FromRoute] int id, [FromServices] TodoDb db) =>
{
    var result = db.todos.Where<TodoModel>(model => model.id == id).First();
 
    if (result is null)
    {
        return TypedResults.NotFound();
    }

    db.todos.Remove(result);
    db.SaveChanges();

    return TypedResults.Ok();
});

app.Run();

I have this TodoModel class:

namespace Todo.Model;

public class TodoModel
{
    public int id { get; set; }
    public required string name { get; set; }

    public DateTime dueDate { get; set; }

    public bool isCompleted { get; set; }

    public static implicit operator List<object>(TodoModel v)
    {
        throw new NotImplementedException();
    }
} 

And a DbContext class that uses in memory Entity Framework Core:

namespace Todo.TodoDb;
using Microsoft.EntityFrameworkCore;
using Todo.Model;

public class TodoDb : DbContext
{
    public TodoDb(DbContextOptions<TodoDb> options) : base(options) { }

    public DbSet<TodoModel> todos => Set<TodoModel>();
    // public required DbSet<TodoModel> todos { get; set; }
}