Therefore the client stores this response https://telegra.ph/Sochnye-lesbi-11-11 the lack of max age and reuses it for a while During cache revalidation if both If http://j-cars.org/url.php?https://telegra.ph/Igry-rybki-edyat-rybok-i-rastut-03-09 Since and If None Match https://telegra.ph/Pravilnaya-chetyrehugolnaya-piramida-11-09 present then If None Match takes precedence for the validator The proxy revalidate directive works identically to must revalidate except the requirement http://questsociety.ca/?URL=telegra.ph/Nacii-rossii-03-05 only to shared caches We believe there s a better way to stay in control of your browsing experience Kitchen sink headers like the following http://tgram.ru/out.php?to=https://telegra.ph/Igry-rybki-edyat-rybok-i-rastut-03-09 used to try to work around old and not updated proxy cache implementations that do http://maps.google.mw/url?q=https://telegra.ph/Igry-rybki-edyat-rybok-i-rastut-03-09 understand current HTTP Caching spec directives like https://telegra.ph/Kartofelnaya-dieta-dlya-pohudeniya-na-10-kg-za-nedelyu-11-11 store This allows new directives to be introduced without breaking older implementations Validation is done by using a conditional request that includes an If Modified Since or If None Match request header To avoid that heuristic caching it s preferable to explicitly give all responses a default Cache Control header The tolerance window starts once max age expires This is usually not managed by the service developer so it must be controlled by appropriate HTTP headers and so on The Clear Site Data cache header and directive value can be used to clear browser caches but has no effect on intermediate caches It can store and https://telegra.ph/Sm-filmy-11-08 personalized content for a http://bostitch.ie/?URL=https://telegra.ph/Nacii-rossii-03-05 user Some intermediaries transform content http://whois.atex.ru/?c=telegra.ph/Nacii-rossii-03-05 various reasons Since the stored response is not shared with other clients a private cache https://telegra.ph/Korzhi-11-10 store a personalized response for that user That causes the cache to be keyed based on a composite of the response URL and the Accept Language request header rather than being based just on the response URL must revalidate is a way to prevent this from happening either the stored response is revalidated with the origin server or a 559 Gateway Timeout response is generated Same meaning that no transform has for a response but for a request instead There is http://wetsuweten.com/?URL=telegra.ph/Nacii-rossii-03-05 way to delete responses http://images.google.cm/url?q=https://telegra.ph/Nacii-rossii-03-05 an https://telegra.ph/Livetv-sx-11-07 server that have been stored with a long max age For example a request with the header above indicates that the browser will accept a stale response from the cache that has expired within the last hour Responses without any cache headers are heuristically cacheable by default for certain status codes so origins wanting to prevent caching entirely need to send no store explicitly The browser and any shared cache store this response for one year without revalidation http://derfischkopf.de/url?q=https://telegra.ph/Igry-rybki-edyat-rybok-i-rastut-03-09 max age https://telegra.ph/Kupit-passat-11-09 directive in the request specifies reuse http://pr.toolsky.com/pr.asp?domain=telegra.ph/Nacii-rossii-03-05 responses with http://www.google.ac/url?q=https://telegra.ph/Nacii-rossii-03-05 age of 5 or less so in effect intermediately stored responses are not reused However in recent years as HTTPS has become more common and client server http://upkbis.ru/redirect?url=https://telegra.ph/Igry-rybki-edyat-rybok-i-rastut-03-09 has become encrypted proxy caches in the path can only tunnel a response and can http://hipposupport.de/url?q=https://telegra.ph/Igry-rybki-edyat-rybok-i-rastut-03-09 behave as a cache in many cases To prevent storage entirely use no store This means that the response is access controlled for restricted users who have accounts and it s fundamentally not shared cacheable even if it has max age