HttpWebRequest. The remote server returned an error: (500) Internal Server Error

Question

I need help with HttpWebRequest in C#. Below lines of codes are working fine for local IIS but when I upload to remote server, it starts to giving me "The remote server returned an error: (500) Internal Server Error.". I have try many variations with GET and POST method but unable to figure it out what is the problem. Please have a look into below code and let me know what is wrong with this.

try
{
    string postData = "applicaitonid=abc&deviceid=xyz";
    string uri = System.Configuration.ConfigurationManager.AppSettings.Get("baseUrl") + System.Configuration.ConfigurationManager.AppSettings.Get("ABApiPath") + "ConfirmAppBinding/?" + postData;

    System.Net.HttpWebRequest request = (System.Net.HttpWebRequest)WebRequest.Create(uri);
    request.Method = "POST"; // Set type Post
    //request.Method = "GET";
    request.UserAgent = Request.UserAgent.ToString();
    request.ContentType = @"application/json";
    request.MediaType = "application/json";
    request.Accept = "application/json";
    request.KeepAlive = false;
    request.ProtocolVersion = HttpVersion.Version11;
    //byte[] buffer = Encoding.GetEncoding("UTF-8").GetBytes(postData);
    request.Timeout = 500000;             //Increase timeout for testing

    Stream reqstr = request.GetRequestStream();
    //reqstr.Write(buffer, 0, buffer.Length);
    reqstr.Close();

    // Read Response
    var httpResponse = request.GetResponse();
    using (var streamReader = new StreamReader(httpResponse.GetResponseStream()))
    {
        JavaScriptSerializer jsSerializer = new JavaScriptSerializer();
        JsonMessage.message = streamReader.ReadToEnd();
        streamReader.Close();
    }
}
catch (WebException e)
{
    JsonMessage.message = e.Message;
    return Json(JsonMessage, JsonRequestBehavior.AllowGet);
}

As I told you, I have used default GET method but it didn't solve the problem.

Beverle

I have edited your title. Please see, "Should questions include “tags” in their titles?", where the consensus is "no, they should not". – Cinderellacindi

The problem is on the server side. – Loyce

Have you looked at the response body in the exception? See #11829343. – Cinderellacindi

Answer 1

Use this code for catch

catch (WebException e)
{
   string pageContent = new StreamReader(wex.Response.GetResponseStream()).ReadToEnd().ToString();
   return pageContent;
}

It'll show the exact error you are facing.

Ferrite

Thank you! this helped me figure out that i had the [ValidateAntiyForgeryToken] on my controller denying me my request from the error. – Boeke

Thank you !! this helped me to figure out the issue... – Oophorectomy

Answer 2

You can use try and catch block to find the root cause.

catch (WebException ex)
{
    string message = new StreamReader(ex.Response.GetResponseStream()).ReadToEnd();
}

Sicular

Answer 3

i will take a stab in the dark

Could it be you have a spelling mistake in your querystring and when reference the key in code it comes back with a nullvalue exception ?

{ String postData = "applicaitonid=abc&deviceid=xyz"; 
}

should be

{ String postData = "applicationid=abc&deviceid=xyz";  }

Adornment

Ignore spelling mistake in query string. Its typo in here. Code is working fine in locally. But when I publish it to remote server then its giving "The remote server returned an error: (500) Internal Server Error". – Beverle

There are a lot of "Variables", how about your uri value? does the abapipath directory exist on the remote server ? – Adornment

@Adornment I indeed was hitting same issue. Instead of userId, I was using 'userID'. Thanks. – Escheat