Random exception on Web service call RSS

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  eric.bryan

  Member

  3 Points

  39 Posts

  Random exception on Web service call

  Jul 03, 2020 07:49 PM|eric.bryan|LINK

  Hello everybody,

  I have a Web service which works fine in production environment.
  But sometimes (randomly) an exception is raised :
  à System.Threading.Tasks.Task.ThrowIfExceptional(Boolean includeTaskCanceledExceptions)\r\n
à System.Threading.Tasks.Task`1.GetResultCore(Boolean waitCompletionNotification)\r\n
à System.Threading.Tasks.Task`1.get_Result()\r\n
à fctSendRequestSynchrone[T](String sRequest, enumHttpMethod eMethod, Object oParams)\r\n
à API.csRestApi.<SendRequest>d__0`1.MoveNext()"

  Here is my code :
  
  .........

  //Here is the line which raises the exception :
fctSendRequestSynchrone<string>(string.Format("logs/{0}/message", _lIdLog), cs.enumHttpMethod.POST, oLogLigne);

  .........
//-------------------------------------------------------------------------------------

  private T fctSendRequestSynchrone<T>(string sRequest, csRestApi.enumHttpMethod eMethod, object oParams = null)
{
Task<T> otask = SendRequest<T>(sRequest, eMethod, oParams);
return otask.Result;
}

  //-------------------------------------------------------------------------------------

  public async Task<T> SendRequest<T>(string sAction, enumHttpMethod eMethod, object oParams = null)
{

  string sResponse = string.Empty;
T oValue;

  using (var oClient = new HttpClient(new LogginHandler(_oCnx, new HttpClientHandler())))
{
oClient.DefaultRequestHeaders.Accept.Clear();
oClient.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));

  string sRequest = string.Concat(_sUrlApi, "/", sAction);

  if (_oToken != null)
{
oClient.DefaultRequestHeaders.Authorization = new System.Net.Http.Headers.AuthenticationHeaderValue(_oToken["token_type"], _oToken
["access_token"]);
}

using (HttpResponseMessage oResponse = await oClient.PostAsJsonAsync(sRequest, oParams))
{
if (oResponse.IsSuccessStatusCode)
{
HttpContent content = oResponse.Content;
sResponse = await content.ReadAsStringAsync();
}
else
{
throw new RestApiException(oResponse);
}
}

  }

  oValue = JsonConvert.DeserializeObject<T>(sResponse);

  return oValue;
}

  Do you have an idea ?

  Thank you very much in advance.

  Eric

• • Reply
  mgebhard

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  53081 Points

  23655 Posts

  Re: Random exception on Web service call

  Jul 04, 2020 10:17 AM|mgebhard|LINK

  I'm not sure why you shared the SendRequest method as it is not used or part of the error message.

  The fctSendRequestSynchrone method wastes a thread and blocks.  I assume the actual problem is with the fctSendRequest which is not shared.

• • Reply
  eric.bryan

  Member

  3 Points

  39 Posts

  Re: Random exception on Web service call

  Jul 04, 2020 02:25 PM|eric.bryan|LINK

  Thank you for your reply mgebhard.

  In fact I was wrong, I corrected the fctSendRequest into SendRequest.

  I have updated my post.