/// <param name='id'>
        /// Todo item id
        /// </param>
        /// <param name='todoItem'>
        /// Todo item to update
        /// </param>
        /// <param name='customHeaders'>
        /// Headers that will be added to request.
        /// </param>
        /// <param name='cancellationToken'>
        /// The cancellation token.
        /// </param>
        /// <exception cref="HttpOperationException">
        /// Thrown when the operation returned an invalid status code
        /// </exception>
        /// <return>
        /// A response object containing the response body and response headers.
        /// </return>
        public async Task <HttpOperationResponse> UpdateTodoWithHttpMessagesAsync(double id, UpdateTodoItem todoItem = default(UpdateTodoItem), Dictionary <string, List <string> > customHeaders = null, CancellationToken cancellationToken = default(CancellationToken))
        {
            if (todoItem != null)
            {
                todoItem.Validate();
            }
            // Tracing
            bool   _shouldTrace  = ServiceClientTracing.IsEnabled;
            string _invocationId = null;

            if (_shouldTrace)
            {
                _invocationId = ServiceClientTracing.NextInvocationId.ToString();
                Dictionary <string, object> tracingParameters = new Dictionary <string, object>();
                tracingParameters.Add("id", id);
                tracingParameters.Add("todoItem", todoItem);
                tracingParameters.Add("cancellationToken", cancellationToken);
                ServiceClientTracing.Enter(_invocationId, this, "UpdateTodo", tracingParameters);
            }
            // Construct URL
            var _baseUrl = BaseUri.AbsoluteUri;
            var _url     = new System.Uri(new System.Uri(_baseUrl + (_baseUrl.EndsWith("/") ? "" : "/")), "api/todos/{id}").ToString();

            _url = _url.Replace("{id}", System.Uri.EscapeDataString(SafeJsonConvert.SerializeObject(id, SerializationSettings).Trim('"')));
            // Create HTTP transport objects
            var _httpRequest = new HttpRequestMessage();
            HttpResponseMessage _httpResponse = null;

            _httpRequest.Method     = new HttpMethod("PUT");
            _httpRequest.RequestUri = new System.Uri(_url);
            // Set Headers


            if (customHeaders != null)
            {
                foreach (var _header in customHeaders)
                {
                    if (_httpRequest.Headers.Contains(_header.Key))
                    {
                        _httpRequest.Headers.Remove(_header.Key);
                    }
                    _httpRequest.Headers.TryAddWithoutValidation(_header.Key, _header.Value);
                }
            }

            // Serialize Request
            string _requestContent = null;

            if (todoItem != null)
            {
                _requestContent      = SafeJsonConvert.SerializeObject(todoItem, SerializationSettings);
                _httpRequest.Content = new StringContent(_requestContent, System.Text.Encoding.UTF8);
                _httpRequest.Content.Headers.ContentType = System.Net.Http.Headers.MediaTypeHeaderValue.Parse("application/json; charset=utf-8");
            }
            // Send Request
            if (_shouldTrace)
            {
                ServiceClientTracing.SendRequest(_invocationId, _httpRequest);
            }
            cancellationToken.ThrowIfCancellationRequested();
            _httpResponse = await HttpClient.SendAsync(_httpRequest, cancellationToken).ConfigureAwait(false);

            if (_shouldTrace)
            {
                ServiceClientTracing.ReceiveResponse(_invocationId, _httpResponse);
            }
            HttpStatusCode _statusCode = _httpResponse.StatusCode;

            cancellationToken.ThrowIfCancellationRequested();
            string _responseContent = null;

            if ((int)_statusCode != 202 && (int)_statusCode != 404)
            {
                var ex = new HttpOperationException(string.Format("Operation returned an invalid status code '{0}'", _statusCode));
                if (_httpResponse.Content != null)
                {
                    _responseContent = await _httpResponse.Content.ReadAsStringAsync().ConfigureAwait(false);
                }
                else
                {
                    _responseContent = string.Empty;
                }
                ex.Request  = new HttpRequestMessageWrapper(_httpRequest, _requestContent);
                ex.Response = new HttpResponseMessageWrapper(_httpResponse, _responseContent);
                if (_shouldTrace)
                {
                    ServiceClientTracing.Error(_invocationId, ex);
                }
                _httpRequest.Dispose();
                if (_httpResponse != null)
                {
                    _httpResponse.Dispose();
                }
                throw ex;
            }
            // Create Result
            var _result = new HttpOperationResponse();

            _result.Request  = _httpRequest;
            _result.Response = _httpResponse;
            if (_shouldTrace)
            {
                ServiceClientTracing.Exit(_invocationId, _result);
            }
            return(_result);
        }