I'm communicating with a web server from .Net. The web server throws a 500 internal server error and writes a detailed error message.
I'm trying to read the error message that is received from a web exception, but getting another web exception. Why is the second WebException thrown?
try
{
var webResponse = (HttpWebResponse)webRequest.GetResponse();
}
catch (WebException e)
{
if (e.Status == WebExceptionStatus.ProtocolError)
{
// the next line throws a web exception
Console.WriteLine(new StreamReader(e.Response.GetResponseStream()).ReadToEnd());
}
}
Why is this surprising? Try the following from MSDN:
try {
// Create a web request for an invalid site. Substitute the "invalid site" strong in the Create call with a invalid name.
HttpWebRequest myHttpWebRequest = (HttpWebRequest) WebRequest.Create("invalid site");
// Get the associated response for the above request.
using (HttpWebResponse myHttpWebResponse =
(HttpWebResponse) myHttpWebRequest.GetResponse()) {
myHttpWebResponse.Close();
}
}
catch(WebException e) {
Console.WriteLine("This program is expected to throw WebException on successful run."+
"\n\nException Message :" + e.Message);
if(e.Status == WebExceptionStatus.ProtocolError) {
var response = ((HttpWebResponse)e.Response);
Console.WriteLine("Status Code : {0}", response.StatusCode);
Console.WriteLine("Status Description : {0}", response.StatusDescription);
try {
using (var stream = response.GetResponseStream()) {
using (var reader = new StreamReader(stream)) {
var text = reader.ReadToEnd();
Console.WriteLine(text);
}
}
} catch (WebException ex) {
// Oh, well, we tried
}
}
}
catch(Exception e) {
Console.WriteLine(e.Message);
}