As I know, cached files or their content aren't uploaded back to webserver.
Al 29/03/14 15:24, En/na [email protected] ha escrit: > I would like to report some additional findings: > > One way to track a user is to use graphic files as a substitute for > cookies. An image is created on a server with an identification number > encoded as color information. This image will be saved on a user’s > computer in the browser cache. When this user visits the website again, > the locally stored image file will be opened and analyzed. The stored > color information will be sent back to the server to make tracking > possible. Since graphics are stored in a different location than > cookies, they aren’t deleted when you clear your cookies. Other > techniques include HTTP E-Tags, Flash cookies or web storage. > > -- > http://gnuzilla.gnu.org -- http://gnuzilla.gnu.org
