System.Net.WebException: The remote server returned an error: (500) Internal Server Error.

  • Thread starter Thread starter kuladeep.mohan
  • Start date Start date
K

kuladeep.mohan

Hi
I am trying to consume a web service from asp.net web page through
HTTP POST method and I am getting the following error message

"System.Net.WebException: The remote server returned an error: (500)
Internal Server Error."


I have been searchign the web and followed all the options which worked

for others


1. Changed the web.config of the web service to accomodate HttpPost
<webServices>
<protocols>
<add name="HttpGet"/>
<add name="HttpPost"/>
</protocols>
</webServices>


2. Used the HttpRequest.Credentials =
CredentialCache.DefaultCredentials;


I am not sure what is wrong there it fails while the request is sent to

the web service. The web service works fine with other web clients


Let me know your ideas


thanks
Mohan
 
Other web clients? What is different? Run the debugger on the server,
set a breakpoint and POST from your client, and step through the code
 
sirfunusa said:
Other web clients? What is different? Run the debugger on the server,
set a breakpoint and POST from your client, and step through the code
Click to expand...

Other clients I mean when I reference the web service and access the
web method it works fine...But when I use an ASP.NET page with the
HTTPReuest Object as shown below it throws the error


"System.Net.WebException: The remote server returned an error: (500)
Internal Server Error."

Code :

HttpWebRequest wr =
(HttpWebRequest)WebRequest.Create("http://localhost//SubtractNumbers//Service1.asmx//Subtract");




wr.Method = "POST";
wr.ContentType = "application/x-www-form-urlencoded";
//wr.ContentLength = bytes.Length;

StreamWriter writer = new
StreamWriter(wr.GetRequestStream(),System.Text.Encoding.UTF8);
// // Write the xml text into the stream
writer.WriteLine("Hi");
writer.Close();


WebResponse wrs = wr.GetResponse();
Stream strm = wrs.GetResponseStream();
StreamReader sr = new StreamReader(strm);
String line;
while( (line = sr.ReadLine()) != null)
Response.Write(line);
strm.Close();
 
sirfunusa said:
Other web clients? What is different? Run the debugger on the server,
set a breakpoint and POST from your client, and step through the code
Click to expand...

Other clients I mean when I reference the web service and access the
web method it works fine...But when I use an ASP.NET page with the
HTTPReuest Object as shown below it throws the error


"System.Net.WebException: The remote server returned an error: (500)
Internal Server Error."

Code :

HttpWebRequest wr =
(HttpWebRequest)WebRequest.Create("http://localhost//SubtractNumbers//Service1.asmx//Subtract");




wr.Method = "POST";
wr.ContentType = "application/x-www-form-urlencoded";
//wr.ContentLength = bytes.Length;

StreamWriter writer = new
StreamWriter(wr.GetRequestStream(),System.Text.Encoding.UTF8);
// // Write the xml text into the stream
writer.WriteLine("Hi");
writer.Close();


WebResponse wrs = wr.GetResponse();
Stream strm = wrs.GetResponseStream();
StreamReader sr = new StreamReader(strm);
String line;
while( (line = sr.ReadLine()) != null)
Response.Write(line);
strm.Close();
 
Are you sending the proper XML message (SOAP)? If your message isn't
formatted properly, you will definately get a server 500 error back.
It looks liek you are actually just sending text ("Hi"). That's not a
proper SOAP message. Here is a sample of a SOAP message:
http://www.w3.org/2004/06/03-google-soap-wsdl.html .

I personally much of web services manually because it's just easier to
interop with COM that way.

Here's part of what I do... (also be sure to set your SOAPAction in the
http header!) messageData hold my XML message I'm sending.

ASCIIEncoding encoding = new ASCIIEncoding( );
byte[] buffer = encoding.GetBytes(messageData);

HttpWebRequest myRequest =
(HttpWebRequest)WebRequest.Create(this.EndPoint);
myRequest.Method = "POST";
myRequest.ContentType = "text/xml";
myRequest.ContentLength = buffer.Length;
myRequest.Headers.Add(String.Format("SOAPAction: \"{0}\"",
operationName));
myRequest.Timeout = 10000;

using (Stream newStream = myRequest.GetRequestStream( )) {
newStream.Write(buffer, 0, buffer.Length);
newStream.Close( );
}

HttpWebResponse myHttpWebResponse =
(HttpWebResponse)myRequest.GetResponse( );

string rawResponse =
GetWebResponseString(myHttpWebResponse);

myHttpWebResponse.Close( );

Here is the GetWebResponseString method...

private static string GetWebResponseString(WebResponse
myHttpWebResponse) {
StringBuilder rawResponse = new StringBuilder( );
using (Stream streamResponse =
myHttpWebResponse.GetResponseStream( )) {
using (StreamReader streamRead = new
StreamReader(streamResponse)) {
Char[] readBuffer = new Char[256];
int count = streamRead.Read(readBuffer, 0, 256);

while (count > 0) {
String resultData = new String(readBuffer, 0,
count);
rawResponse.Append(resultData);
count = streamRead.Read(readBuffer, 0, 256);
}
}
}
return rawResponse.ToString( );
}

Look closely at what is returned. You may actually be getting the
reason for the fault in the message.

Also, if all is successful, you will get an XML message back. Are you
prepared to parse it?

You may want to actually use the .NET web service mechanism if you
don't want to do everything manually. Since you aren't using the .NET
web service mechanism the web.config configuration doesn't apply.

If you are intending to use .NET for web services, then all you have to
do is add the WSDL file as a web reference and use it as though it were
local. There's not really much work to it. If that is the case then
everything I said above is void, since this is the manual way to do it.
 
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