![]() ![]() Gateway - Similar to in-app caches, Gateway caches live as. For example, the header Vary: Accept-Language, User-Agent specifies that a cached version must exist for each combination of user agent and language. HTTP Proxy - A proxy cache is a public, shared cache often employed by an ISP or large corporation. Vary– A header that determines the responses that must match a cached resource for it to be considered valid.If a token is unchanged before a request is made, the browser continues to use its local version. ETag – A response header that identifies the version of served content according to a token – a string of characters in quotes, e.g., "675af34563dc-tr34" – that changes after a resource is modified.The expires header is ignored when a cache-control header containing a max-age directive is present. For example, Expires: Sat, 07:00:00 GMT signals that the cached resource expires on at 7:00 am GMT. Expires – This header specifies a fixed date/time for the expiration of a cached resource.In addition to cache-control, notable HTTP cache headers include: For example, a web page response marked as private can be cached by a desktop browser, but not a content delivery network (CDN). The private response directive indicates that a resource is user specific-it can still be cached, but only on a client device. The public response directive indicates that a resource can be cached by any cache. This setting is usually used for sensitive data, such as personal banking details. ![]() The no-store directive means browsers aren’t allowed to cache a response and must pull it from the server each time it’s requested. The no-cache directive means that a browser may cache a response, but must first submit a validation request to an origin server. A private cache is only used by one client, only for the IP it was created for. As such, it gives a greater performance gain and a much greater scalability gain, as a user may receive cached copies of representations without ever having obtained a copy directly from the origin server. However, you can make authenticated pages. A public, or shared cache is used by more than one client. Downing Street still did not make a decision on launching a probe in allegations the home secretary asked civil servants to help arrange a private speed awareness course Labour was fined for the. After expiring, a browser must refresh its version of the resource by sending another request to a server.įor example, cache-control: max-age=120 means that the returned resource is valid for 120 seconds, after which the browser has to request a newer version. By default, pages protected with HTTP authentication are considered private they will not be kept by shared caches. The max-age request directive defines, in seconds, the amount of time it takes for a cached copy of a resource to expire. An example of an HTTP Response Header from Cache-Control: Max-Age ![]()
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