CODEWITHSUNDEEP
.nethttpsoap
Daniel Williams
Daniel Williams

Reputation: 9324

Want to read status 500 errors in .NET. Fiddler shows me readable response, why can't I get in .NET?

In Fiddler, I can pass in a request and get a response 500. Fine by me, I want my .NET code to handle this AND analyze the response message. In the case below there is a meaningful message. Yet using HttpWebRequest and HttpWebResponse, I cannot get that information.

Here is the response from Fiddler:

HTTP/1.1 500 Internal Server Error
Date: Sun, 25 Mar 2012 15:50:31 GMT
Transfer-Encoding: chunked
Content-Type: text/xml; charset=ISO-8859-1
X-Powered-By: Servlet/2.5 JSP/2.1

010e
<soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/"><soap:Body><soap:Fault><faultcode>soap:Client</faultcode><faultstring>WSS header is missing from request. Can't do username token authentication.</faultstring></soap:Fault></soap:Body></soap:Envelope>
0000

Here is my code which tries to catch the exception:

        try
        {
            HttpWebResponse resp2 = (HttpWebResponse) req.GetResponse();
        }
        catch (WebException ex)
        {
            WebException we = (WebException) ex;
            HttpWebResponse respp = (HttpWebResponse) we.Response;
            log.Info((int)respp.StatusCode);
            log.Error(ex.ToString());
        }

I just cannot get anything more from the exception object. But I know the response should be readable. Hopefully there are lower-level http classes I can use that I just don't know about now. I don't want .NET protecting me from the real HTTP protocols.

Upvotes: 0

Views: 3814

Answers (2)

Magnus Johansson
Magnus Johansson

Reputation: 28325

I think you can catch the SoapException instead.

try
  {
    // do your thing
  }
  catch (SoapException soapEx)
  {
    MessageBox.Show(soapEx.Code.ToString());
    //Load the Detail element of the SoapException object
    XmlDocument doc = new XmlDocument();
    doc.LoadXml(soapEx.Detail.OuterXml);
    XmlNamespaceManager nsManager = new
      XmlNamespaceManager(doc.NameTable);
    // Add the namespace to the NamespaceManager
    nsManager.AddNamespace("errorNS",
      "WSSoapException");
    XmlNode Node =
      doc.DocumentElement.SelectSingleNode("errorNS:Error",
                                           nsManager);
    string errorNumber =
      Node.SelectSingleNode("errorNS:ErrorNumber",
                                    nsManager).InnerText;
    string errorMessage =
    Node.SelectSingleNode("errorNS:ErrorMessage",
                                nsManager).InnerText;
    string errorSource =
    Node.SelectSingleNode("errorNS:ErrorSource",
                                nsManager).InnerText;
    MessageBox.Show("Error Number is " + errorNumber);
    MessageBox.Show("Error Message is " + errorMessage);
    MessageBox.Show("Error Source is " + errorSource);

  }
  catch (Exception ex)
  {
    MessageBox.Show(ex.Message);
  }

Upvotes: 0

Jon Skeet
Jon Skeet

Reputation: 1503964

It's not clear what you've tried to do with respp. (I note that you're not using resp2, either.) For example, what does this do:

catch (WebException ex)
{
    using (HttpWebResponse respp = (HttpWebResponse) ex.Response)
    {
        log.Info((int)respp.StatusCode);
        log.Error(ex.ToString());
        log.Error(new StreamReader(respp.GetResponseStream()).ReadToEnd());
    }
}

(It's never been clear to me whether you really need to dispose of a WebResponse obtained in a WebException, but it's probably a good idea. You might want to dispose of the response stream as well, although I believe disposing of the response is good enough.)

Upvotes: 3

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