Slightly off topic: Rails & redirects, etc

As a relative newbie to HTTP as well as Rails, is there a good
introduction to how, say, redirects, links, etc., are implemented from
the perspective of clients and servers as well as how Rails does
things “on top of” HTTP?

The wiki article, http://en.wikipedia.org/wiki/URL_redirection , is a
good start, I guess, but I want even more basic tutorial-like
information. Even a basic book recommendation would be appreciated.

Ralph S.