/// <inheritdoc/>
protected override void Execute()
{
// Try once without credentials, then retry with if required
bool useCredentials = false;
while (true)
{
var request = BuildRequest(useCredentials);
try
{
Download(request);
return;
}
catch (WebException ex)
{
switch (ex.Status)
{
case WebExceptionStatus.RequestCanceled:
throw new OperationCanceledException();
case WebExceptionStatus.ProtocolError:
if (ex.Response is HttpWebResponse response && response.StatusCode == HttpStatusCode.Unauthorized && CredentialProvider != null)
{
if (useCredentials)
{
CredentialProvider.ReportInvalid(ex.Response.ResponseUri);
}
// Retry (but only once when non-interactive)
if (CredentialProvider.Interactive || !useCredentials)
{
useCredentials = true;
continue;
}
}
break;
}
// Wrap exception to add context
throw new WebException(string.Format(Resources.FailedToDownload, Source), ex, ex.Status, ex.Response);
}
}
}