[REBOL] exists?

[bciceron]

when applied to a URL it returns true if it can read it, false
otherwise. this is an outstanding feature that shows the power of rebol,
with an unified model cross the net. but ...

i suggest either some refinement or an excpetion raised when the url may
exist but there is no permission to access it (e.g password protected) or
when the url is automatically forwarded to another one (e.g obsolete url
with auot-redirection) .

what do you think ?

ben