title: HttpActionExecutedContext response content always is empty
body: <p>When throws an exception in server side, the response content in OnException works well but in client side (SendAsync) it is empty..</p>
  
  <pre><code>public override void OnException(HttpActionExecutedContext context)
  {
      var exception = context.Exception;
      if (exception == null) return;
  
      context.Response = new HttpResponseMessage(HttpStatusCode.InternalServerError);
      context.Response.Content = new StringContent(exception.Message);
  }
  
  protected override async Task&lt;HttpResponseMessage&gt; SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
  {
      HttpResponseMessage response = null;
  
      var responseBodyAsText = string.Empty;
      try
      {
          response = await base.SendAsync(request, cancellationToken);
  
          if (!response.IsSuccessStatusCode)
          {
              responseBodyAsText = await response.Content.ReadAsStringAsync();
          }
  
          response.EnsureSuccessStatusCode();
      }
      catch (HttpRequestException ex)
      {
          throw new BusinessException(responseBodyAsText);
      }
  
      return response;
  }
  </code></pre>