FeatherHttpTodocalls.cs

using System.Collections.Concurrent;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Http;

namespace testFeather
{
    class Program
    {
        private static ConcurrentBag<TodoItem> todoItemCollection;
        static async Task Main(string[] args)
        {
            var app = WebApplication.Create(args);

            app.MapGet("/api/todos", GetTodos);
            app.MapPost("api/todos", CreateTodo);

            todoItemCollection = new ConcurrentBag<TodoItem>();
            await app.RunAsync();
        }

        static async Task CreateTodo(HttpContext http)
        {
            var todo = await http.Request.ReadJsonAsync<TodoItem>();
            todoItemCollection.Add(todo);
            
            http.Response.StatusCode = 204;
        }

        static async Task GetTodos(HttpContext http)
        {
            if(todoItemCollection.Count == 0)
            {
                todoItemCollection.Add( new TodoItem{Id = 1, Name = "test", IsComplete = false});
                todoItemCollection.Add(new TodoItem{Id=2, Name="hello", IsComplete=true});
            }

            await http.Response.WriteJsonAsync(todoItemCollection);
        }
    }
}