Chris Withers writes:

Dieter Maurer wrote:

...

By the way, Zope should cope with rounding problems for the "If-Modified-Since" headers.

AFAIK, Brian Lloyd fixed this with a pretty generalised try...except in Image.py If stuff is still getting through, we should narrow it down further... No traceback, because no exception.

I speak of a true rounding problem: the image is modified at "x" (expressed in seconds) Zope sends "x" converted to a date/time string as "Last-Modified" Zope receives the date/time string back as "If-Modified-Since". Zope converts it to a "long", say y. *BUT* y is not x, it is "x-1". Of cause, this does not happen for all modification times. But there are not too few of them. Dieter