[...]
I notified this site about the error and here is their response:

"FYI, this is failing because your file fetcher is not sending HTTP
Accept headers and is thus considered insecure by our Web server. You
may want to fix that..."

I don't fully understand this response but, sure enough, if I load the
URL above using Internet Explorer, it appears to work just fine.

Does XmlDocument have some protocol problems, or is there something I
can do to make my code work in this case?

I'm using XmlDocument.Load to retrieve a PAD (XML) file. My code looks
something like this:

XmlDocument xml = new XmlDocument();

// Non-HTTP prefix not supported
if (!url.StartsWith("http://", StringComparison.OrdinalIgnoreCase))
throw new Exception("PAD URL contains an unsupported protocol
prefix");

// Load XmlDocument
xml.Load(url);

When url is set to "http://www.mobiletutor.org/guitar/jar.xml", I get the
following error:

The remote server returned an error: (400) Bad Request.

I notified this site about the error and here is their response:

"FYI, this is failing because your file fetcher is not sending HTTP
Accept headers and is thus considered insecure by our Web server. You
may want to fix that..."

I don't fully understand this response but, sure enough, if I load the URL
above using Internet Explorer, it appears to work just fine.

Does XmlDocument have some protocol problems, or is there something I can
do to make my code work in this case?

Thanks for any tips.

--
Jonathan Wood
SoftCircuits Programming
http://www.softcircuits.com