public Task<HttpResponseMessage> Put(object modifieds, CancellationToken token)
{
var uri = new Uri(string.Format(PARSE_ROOT_URL + "/classes/{0}/{1}", _className, _criteria));
string json = modifieds.ToJson(_serializer);
var content = new StringContent(json);
var request = new HttpRequestMessage(HttpMethod.Put, uri)
{
Content = content
};
return _client.SendAsync(request, HttpCompletionOption.ResponseHeadersRead, token);
}