![]() page already visited) or if the server processing differed between the browser sending a cookie or not (i.e. This way one can detect if the user has visited a site or a specific page before, because the timing to load the resource might slightly differ if the resource was loaded from browser cache (i.e. History sniffing basically works by observing side effects (usually timing differences) when including well known resources from other sites. Apart from that, use of cross-site trackers and advertisement networks (Google Analytics and others) offer cross-site profiling of a user based on the users history. Techniques to do such cross-site detecting of the users browser history are known under the term "history sniffing". But there are ways to "probe" the history and thus detect previous access to a specific page or site. There is no direct cross-site access to the browsers history. Do websites know which previous website I visited?
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