How to retrieve CancellationToken from http request on webApi?

I'm sending request to server like this via HttpClient:

public async Task GetTest()
{
    CancellationTokenSource tokenSource = new CancellationTokenSource();
    string url = String.Format($"api/Test/getTest");

    HttpResponseMessage response = await _httpClientFactory.HttpClient.GetAsync(url, tokenSource.Token).ConfigureAwait(false);

    response.EnsureSuccessStatusCode();
}

On WebApi (Core 2.1) method is like this:

[HttpGet("getTest")]
public async Task<IActionResult> GetTest(CancellationToken token)
{
    try
    {
        object test = await _dataService.GetTest(token);

        return Ok(test);
    }
    catch (Exception ex)
    {
        this._logger.LogError(ExceptionHelper.ExMessageDeepGet(ex));
        return new InternalServerErrorWithMessageResult(ex);
    }
}

In _dataService.GetTest(token) I do token.ThrowIfCancellationRequested();

Problem is that I get new token on webapi, not the one I've send via client so if I stop request (shut down client) before response from api, no exception is thrown..

Any suggestions?