libURL getting .RDF files

[thinkertoys]

I'm trying to get .RDF files using libURL w/ no luck.

For example - I can view http://www.macnn.com/macnn.rdf from my browser, 
but the following script does not work:

on mouseUp
  put "http://www.macnn.com/macnn.rdf" into aURL
  get URL aURL
  put it into fld R
end mouseUp

I believe it's probably a trivial thing, maybe just modifying the HTTP 
Header? I'm not sure - anyone?

Thanks in advance,
Eric