For the record, this issue has been fixed today in r6960.
I wrote a few months ago (08/06/09):
> I am trying to use "repoze.bitblt" and could not make it work when my
> HTML pages use absolute URLs _without_ FQDN, like "/pics/23". For
> example, the following tag:
> <img src="/pics/23" ...
> is transformed into:
> <img src="pics/bitblt-.../23" ...
> Note that the leading slash has disappeared. Of course, the image may
> not be found.
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