Mongrel users - Oct 2008 - Trailing "/" not implicitly added to end of URI

I''m running a single mongrel instance with a registered DirHandler.

I cannot use relative paths in any HTML that is served (e.g.
"images/myimage.png") unless there is an explicit "/" at the
end of my
URI. So

http://mywebsite.com/folder/ (image works)
http://mywebsite.com/folder (image does not work)

Is this a bug or was it designed this way. Is there an accepted way to
get this working?

Thanks

HGP