using System;

using System.Net.Http;

using System.Threading.Tasks;

using Shouldly;

using IdentityModel.Client;

​

public class Program

{

    public static async Task Main()

    {

        HttpClient _httpClient = new HttpClient();

        const string token = "eyJ0eXA";

        const int numberOfTimes = 10_000_000;

​

        // Set the token on the HttpClient asynchronously in a loop of numberOfTimes.

        _httpClient.SetBearerToken("foo");

         Task.Run(async () =>

        {

            for (var i = 0; i < numberOfTimes; i++)

            {

                _httpClient.SetBearerToken(token);

            }

        });

        // Check the token on the HttpClient asynchronously in a loop of numberOfTimes.

        await Task.Run(async () =>

        {

            await Task.Delay(10); // Give the other task a chance to run.

            for (var i = 0; i < numberOfTimes; i++)

            {

                var authHeader = _httpClient.DefaultRequestHeaders.Authorization;

                authHeader.ShouldNotBeNull();

                authHeader.Parameter.ShouldBe(token);

            }

        });

​

        _httpClient.DefaultRequestHeaders.Authorization.ShouldNotBeNull();

        _httpClient.DefaultRequestHeaders.Authorization.Parameter.ShouldBe(token);

    }

}