BrowserSpy.dk shows you just how much information can be retrieved from your browser just by visiting a page.
Available tests are listed below.
Find out which UserAgent string your browser sends. The UserAgent string is send via a HTTP header whenever the browser makes a request to a site. The header can easily be spoofed. The UserAgent string typically includes information such as the application name, version, host operating system, and language.
|UserAgent from header||CCBot/2.0 (http://commoncrawl.org/faq/)|