> It would be nice to save complete files only when
> possible. Thus, where the Content-size header is
> received, it writes to a temporary file and moves the
> file to the mirror when it's completed.

Humm, if the temporary file is outside the current disk, this will require a
second copy (not really efficient)

Note that is an error occurs, the file won't be validated by the cache, and
will be recaught