JL. JL. - 3 months ago 19
C# Question

How can I catch a 404?

I have the following code:

HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
request.Method = "HEAD";
request.Credentials = MyCredentialCache;

try
{
request.GetResponse();
}
catch
{
}


How can I catch a specific 404 error? The WebExceptionStatus.ProtocolError can only detect that an error occurred, but not give the exact code of the error.

For example:

catch (WebException ex)
{
if (ex.Status != WebExceptionStatus.ProtocolError)
{
throw ex;
}
}


Is just not useful enough... the protocol exception could be 401, 503, 403, anything really.

Answer

Use the HttpStatusCode Enumeration, specifically HttpStatusCode.NotFound

Something like:

HttpWebResponse errorResponse = we.Response as HttpWebResponse;
if (errorResponse.StatusCode == HttpStatusCode.NotFound) {
  //
}

Where
we is a WebException.

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