Jeff Garzik's Linux Pages: 'Expires' website speed boost
Dec 27, 2006, 12:00 (0 Talkback[s])
(Other stories by Jeff Garzik)
[ Thanks to Jeff
Garzik for this link. ]
"...consider the "question" that each browser and caching proxy
must ask itself, before requesting a page: Has this content changed
since the last time I requested it from the server?
"It should obvious that the answer to this question cannot be
obtained from a last-modified timestamp."