JsonContent for writing gzipped JSON in web requests

JsonContent.cs

public class JsonContent : HttpContent
{
  private readonly JsonSerializer _serializer = new JsonSerializer();
  private readonly object _value;

  public JsonContent(object value)
  {
    _value = value;
    Headers.ContentType = new MediaTypeHeaderValue("application/gzip");
  }

  protected override bool TryComputeLength(out long length)
  {
    length = -1;
    return false;
  }

  protected override Task SerializeToStreamAsync(Stream stream, TransportContext context)
  {
    return Task.Factory.StartNew(() =>
    {
      using (var gzip = new GZipStream(stream, CompressionMode.Compress, true))
      using (var writer = new StreamWriter(gzip))
      {
        _serializer.Serialize(writer, _value);
      }
    });
  }
}

//To use it
var request = new HttpRequestMessage(HttpMethod.Post, "http://chucknorris.com/api/dropkick");
request.Content = new JsonContent(yourObjectToSerialize);
var response = await _httpClient.SendAsync(request);