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The Wayback Machine - https://web.archive.org/web/20130722184850/http://pgl.yoyo.org:80/http/browser-headers.php

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When your browser requests a web page from a server via HTTP, it sends a set of headers with various bits of information about itself. Below you can see the headers sent by your browser.
HTTP headers supplied by your browser (ec2-204-236-235-245.compute-1.amazonaws.com):
Connection: close
Host: pgl.yoyo.org
User-Agent: ia_archiver (+http://www.alexa.com/site/help/webmasters; crawler@alexa.com)
From: crawler@alexa.com
NB: If you see a header named "Referer" and are wondering why it's spelled incorrectly, it's because the original specification for HTTP/1.0 got it wrong, OK? Please stop asking me about this. From RFC 2616: "The Referer[sic] request-header field allows the client to specify, for the server's benefit, the address (URI) of the resource from which the Request-URI was obtained (the "referrer", although the header field is misspelled.)".