if-modified-since and last-modified
Tom Valley; (valley@ridgefield.sdr.slb.com)
Tue, 5 Aug 1997 07:35:57 -0400
Hi,
Apparently, some, if not most, web servers do not return the last-modified tag.
However, I have noticed that all of them respond to the if-modified-since
method. I can accurately measure if a page has been updated in the last 24
hours, even though the last-modified method fails every time. Why is this?
What value is this method examining, and is there a way to expose this value?
Even for those sites that don't have the last_modified value defined, I'd like
to store the time of the last modification, if I can get it from this other
method.
Thanks...
Thomas