The Wayback Machine - https://web.archive.org/web/20081201134856/http://www.webreference.com/html/tutorial29/7.html
HTTP for HTML Authors, Part II
Summary
In this tutorial you learned of how Web browsers and Web servers
can use some HTTP headers to supply meta-information about themselves
and the documents they exchange, and how some of these headers can be
used to selectively send different versions of a document. You read of
headers that can be used to specify the language, encoding, and media
type of a document, the software type and version of a server or user
agent, and the referring page that led to an HTTP request.
