OdataParallelTest.cs

 internal class Program
    {
        static async Task Main(string[] args)
        {
            var task1 = CheckUrl("http://localhost:5000/api/Job");
            var task2 = CheckUrl("http://localhost:5000/api/Department");
            var task3 = CheckUrl("http://localhost:5000/api/Employment?$filter=Event%2FId%20eq%20d95da18c-2fdf-4574-b8d1-c06d5b080e57&$skip=0&$top=10&$expand=Person,ApplicationShiftAssignments($expand=Shift($expand=Job))");

            await task1;
            await task2;
            await task3;
        }

        protected static async Task CheckUrl(string pUrl)
        {
            var json2 = await Run(pUrl);

            await Parallel.ForEachAsync(new int[10000],
              new ParallelOptions()
              {
                  MaxDegreeOfParallelism = 20
              },
             async (i, c) =>
             {
                 var pjson2 = await Run(pUrl);
                 Console.WriteLine(pUrl);

                 if (pjson2 != json2)
                 {
                     throw new Exception();
                 }
             }
            );
        }

        protected static async Task<string> Run(string pUrl)
        {
            var client = new HttpClient();
            
            client.DefaultRequestHeaders.Authorization = new System.Net.Http.Headers.AuthenticationHeaderValue("Bearer", "...");
            var response = await client.GetAsync(pUrl);

            return await response.Content.ReadAsStringAsync();
        }
    }