Getting response when web file does not exist.

  • Thread starter Thread starter Peter Rilling
  • Start date Start date
P

Peter Rilling

I am trying to use an HttpWebRequest object to get resource from a website.
Now, some of the files that I try to get may not exist. I would like to
check for that condition. When I call GetResponse on files that do not
exist, I get an exception. What I would like is not to have the exception
but allow me to check that StatusCode property for the 402 condition. How
can I do this?
 
Peter said:
I am trying to use an HttpWebRequest object to get resource from a
website. Now, some of the files that I try to get may not exist. I
would like to check for that condition. When I call GetResponse on
files that do not exist, I get an exception. What I would like is
not to have the exception but allow me to check that StatusCode
property for the 402 condition. How can I do this?
Click to expand...

Peter,

HTTP protocol errors such as 404 are escalated by the framework as
WebException instances with the Status property set to
WebExceptionStatus.ProtocolError. In that case, the WebException will have a
valid WebResponse instance in its Response property:

try {
// Do WebRequest
}
catch (WebException ex) {
if (ex.Status == WebExceptionStatus.ProtocolError) {
HttpWebResponse response = ex.Response as HttpWebResponse;
if (response != null) {
// Process response, look for HTTP status code, etc.
}
}
}

Cheers,
 
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