RandomController.cs

using System;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNet.Mvc;

namespace WebApplication1.Controllers
{
    [Route("api/[controller]")]
    public class RandomController : Controller
    {
        [HttpGet]
        public async Task<JsonResult> Get()
        {
            var rand = new Random();
            await Task.Delay(rand.Next(0, 50)); // Emulate tiny latency...
            return new JsonResult(new { 
                numbers = Enumerable.Range(1, 10)
                                    .Select(i => i * rand.NextDouble())
                                    .ToArray()
            });
        }
    }
}