SyncOverAsync.cs

using System.Threading.Tasks;
using Microsoft.AspNetCore.Mvc;

namespace DetectAsync
{
    public class BlockingDetectorController : Controller
    {
        [HttpGet("/sync-over-async")]
        public string SyncOverAsyncMethod()
        {
            MyMethodAsync().Wait();
            
            return "Hello World";
        }
        
        public async Task MyMethodAsync()
        {
            // Just doing a delay here to waiting 100ms like this method actually did something
            await Task.Delay(100);
        }
    }
}