PUBLIC MARKS from nhoizey with tags cache & web

"When a site uses a <META> refresh tag to send the visitor to a URL, IE6 and IE7 treat that as if the user had clicked the “Refresh” or “Reload” button on the browser."

Caching is a great example of the ubiquitous time-space tradeoff in programming. You can save time by using space to store results. Fewer downloads means a faster, happier site.

A Web cache sits between one or more Web servers (also known as origin servers) and a client or many clients, and watches requests come by, saving copies of the responses — like HTML pages, images and files (collectively known as representations) — for itself. Then, if there is another request for the same URL, it can use the response that it has, instead of asking the origin server for it again.