using System;

using System.Threading.Tasks;

using Refit;

public class Program

{

    public class Params {

        [Query(Format = "yyyy'-'MM'-'dd'T'HH':'mm':'ss'Z'")]

        public DateTime Start { get; set; } = DateTime.UtcNow;

    }

    public class Response {

        public string Url {get;set;}

    }

    public interface IApi

    {

        [Get("/get")]

        Task<string> GetTest(Params p);

    }

    public static async Task Main()

    {

        await RestService.For<IApi>("https://postman-echo.com/").GetTest(new Params());

    }

}