[Zope] Exporting an URL with a file extension from a product

Hi All, I'm quite a novice with Zope, and I'm working on a product which exports a style sheet(which is computed, so it can't be a static file). If the URL (and the python function name) is 'stylesheet', it works fine in IE but the style sheet is not cached by Netscape. I believe that the URL in the LINK tag needs to have an extension of .css to be cached by Netscape, but I would be happy to hear otherwise. How can I export an URL named "stylesheet.css" from a python product? gregory