Almost minimal asp.net core sample

01. Program.cs

using System.Threading.Tasks;
using Microsoft.AspNetCore;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Http;

namespace MinimalAspNetCore
{
    internal class Program
    {
        private static void Main(string[] args) => WebHost.CreateDefaultBuilder(args).UseStartup<Program>().Build().Run();

        public void Configure(IApplicationBuilder app, IHostingEnvironment env)
        {
            app.Map(new PathString("/ping"), x => x.Run(Ping));
            app.Map(new PathString("/pong"), x => x.Run(Pong));
        }

        private static async Task Ping(HttpContext context) => await context.Response.WriteAsync("PING RESPONSE");
        private static async Task Pong(HttpContext context) => await context.Response.WriteAsync("PONG RESPONSE");
    }
}

02. Project.csproj

<Project Sdk="Microsoft.NET.Sdk">

    <PropertyGroup>
        <OutputType>Exe</OutputType>
        <TargetFramework>netcoreapp2.2</TargetFramework>
    </PropertyGroup>

    <ItemGroup>
      <PackageReference Include="Microsoft.AspNetCore.All" />
    </ItemGroup>

</Project>