13.3. Cookied Content
Cookies are typically used to personalize pages for a given user (see Section 5.6). In this section, we refer to responses containing a set-cookie header, as well as responses to requests with a cookie header, as cookied content. A cookie may encode user preferences for page appearance and other information that the server uses to personalize the page for this user. When a request for an object contains a cookie, it is typically passed through to the origin server without utilizing the cache. (While HTTP 1.1 decouples the treatment of cookies from the cacheability issue, most proxies do not rely on HTTP 1.1 compliance and do not cache cookied content.)
Interestingly, Wills and Mikhailov [1999] showed that requests with cookies ...
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