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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 (38.103.63.55): X-Cc-List: List:1 For:193.110.91.2 Host: pgl.yoyo.org User-Agent: CCBot/1.0 (+http://www.commoncrawl.org/bot.html) Accept: Accept: application/xhtml+xml,text/html;q=0.9,text/plain; Accept-Language: en-us,en;q=0.5 Accept-Encoding: gzip Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7 Connection: close Cache-Control: no-cache Pragma: no-cache

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.)".