http://www.w3.org/hypertext/WWW/Protocols/Overview.html
is the correct one. No problem so far. But then I accidentally entered
the address as
http://www.cern.ch/hypertext/WWW/Protocols/Overview.html/
--that is, with a trailing slash at the end. This little change gave me
a page that seemed identical to the first one, except the graphics at
the top and bottom of the page failed to load. I can't quite figure out
why this is, but I suspect it has something to do with the files lacking
the .gif suffix. Anyhow, I thought you might want to look into it.
-Ben