HttpClient PostAsync not responding when use in GenericHandler RSS

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  patirop

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  HttpClient PostAsync not responding when use in GenericHandler

  Jul 03, 2018 01:43 PM|patirop|LINK

  Hi, 

  I have a problem about using HttpClient PostAsync. Below sample code, I try to call restful service  from another one restful service. Both create in same asp.net site, the result is no responding but i can call target service manually(use browser) and i can use same code call target service from window console application. Any help?

  using System;
  using System.Collections.Generic;
  using System.Linq;
  using System.Web;
  using System.Data;
  using System.Threading.Tasks;
  using Newtonsoft.Json;
  using System.Net.Http;
  using System.Net;
  using System.IO;
  
  namespace Api
  {
      /// <summary>
      /// Summary description for Gateway
      /// </summary>
      public class Gateway : IHttpHandler
      {
          public void ProcessRequest(HttpContext context)
          {
              try
              {
                  RunAsync(context).Wait();
              }
              catch (Exception ex)
              {
                  context.Response.Write(ex.Message);
              }
          }
  
          protected async Task RunAsync(HttpContext context)
          {
              SearchParameter parm = new SearchParameter();
  
              ApiResponse resp = await CallApi<ApiResponse>("http://localhost:50125/api/Test.ashx", parm);
  
              context.Response.ContentType = "text/javascript";
              context.Response.Write(JsonConvert.SerializeObject(resp));
          }
  
          public static async Task<T> CallApi<T>(string url, object reqData)
          {
              object ret = null;
              var jsonString = JsonConvert.SerializeObject(reqData);
  
              StringContent content = new StringContent(jsonString);
              HttpClient client = new HttpClient();
  
              HttpResponseMessage resp = await client.PostAsync(url, content);
  
              if (resp.StatusCode == HttpStatusCode.OK)
              {
                  Stream stream = await resp.Content.ReadAsStreamAsync();
                  StreamReader sr = new StreamReader(stream);
                  string responseText = sr.ReadToEnd();
                  sr.Dispose();
  
                  try
                  {
                      ret = JsonConvert.DeserializeObject<T>(responseText);
                  }
                  catch (Exception ex)
                  {
                      throw new Exception("Invalid API response object.", ex);
                  }
              }
  
              return (T)ret;
          }
  
          public bool IsReusable
          {
              get
              {
                  return false;
              }
          }
      }
  
      public class ApiResponse
      {
          public string Code = "";
          public string Message = "";
          public string StackTrace = "";
          public string Api = "";
      }
  
      public class SearchParameter
      {
          public string SessionID = "0";
          public string Keyword = "";
      }
  }

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  mgebhard

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  Re: HttpClient PostAsync not responding when use in GenericHandler

  Jul 03, 2018 02:04 PM|mgebhard|LINK

  Have you tried setting a breakpoint and simply debugging the code?

  The parm value is always empty.  Is that expected?

  SearchParameter parm = new SearchParameter();
  
  ApiResponse resp = await CallApi<ApiResponse>("http://localhost:50125/api/Test.ashx", parm);
  

• • Reply
  patirop

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  Re: HttpClient PostAsync not responding when use in GenericHandler

  Jul 04, 2018 01:43 AM|patirop|LINK

  i just try to show sample code. The parameter is not meaning, Test.ashx will return static ApiReponse data.

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  patirop

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  Re: HttpClient PostAsync not responding when use in GenericHandler

  Jul 04, 2018 01:45 AM|patirop|LINK

  i tried to debug program until i found the line of problem, it is "PostAsync". This line will not responding,life time not responding, no error occurs.