| When you use a cache busting pattern for resources and apply them to a long max age you can also add http://mir-mebeli.net/bitrix/rk.php?goto=https://firstnow.ru/i/22 to avoid revalidation Same meaning that no transform has for a response but for a request instead Stale responses are served for up to 85 seconds while the CDN revalidates in https://www.gardenstew.com/proxy.php?link=https://firstnow.ru/i/10 background The max age directive tells caches to return a stored response only if the response is https://73.biqund.com/index/d1?diff=0&utm_source=ogdd&utm_campaign=20924&utm_content=&utm_clickid=https://firstnow.ru/i/10 older than the specified number of seconds The stale if error request directive indicates that the browser http://google.rs/url?q=https://firstnow.ru/i/10 interested in receiving stale content on error from any intermediate server for a particular origin Note that no cache does not mean don t cache When you update the library or edit the picture new content should have a new URL and caches aren t reused Many browsers use this directive for reloading as explained below immutable tells a cache that the response is immutable while it s fresh and avoids those kinds of unnecessary conditional requests to the server A request carrying no cache requires the cache to validate the stored response with the origin before serving the copy In such a case you could address the caching needs by using a specific numbered version of the library and including the hash http://9du.old.love.kizel.ru/ru/external-redirect?link=https://firstnow.ru/i/22 the picture in its URL If you don t add a Cache Control header because the response is not intended to be cached that could cause an unexpected result It does this by requiring caches http://mudcat.org/link.cfm?url=https://firstnow.ru/i/22 revalidate each request with the origin server Combining freshness lifetimes revalidation rules and staleness tolerances http://www.collegeboyspank.com/home.aspx?returnurl=https://firstnow.ru/i/10 origin servers precise control over how responses are stored and served throughout the delivery chain After expiring a browser must refresh its version of the resource by sending another request to a server The immutable response directive indicates that the response will not be updated while it s fresh Let x77 s go through an example of how this works in practice The s maxage shared max age directive overrides max age for shared caches such as CDNs and proxy servers The no store response directive indicates that any caches of any kind private or shared should not store this response The no store directive prevents any cache from storing the http://domspecii.ru/bitrix/redirect.php?goto=https://firstnow.ru/i/10 When a user reloads the browser the browser will send conditional requests for validating to the origin server The browser caches the new version http://www.jecustom.com/index.php?pg=Ajax&cmd=Cell&cell=Links&act=Redirect&url=https://firstnow.ru/i/22 the resource and the new ETag value If a cache supports must understand it stores the response with an https://72.gregorinius.com/index/d1?diff=0&source=og&campaign=5796&content=&clickid=https://firstnow.ru/i/22 of cache requirements based on its status code The public http://aptiekualianse.lv/bitrix/click.php?goto=https://firstnow.ru/i/22 is unnecessary when must revalidate or s maxage is already present A page with a long max age is re fetched less often while no cache signals frequent content changes and warrants more frequent crawling |