It stores a single response and reuses it with multiple users — so developers should avoid storing personalized contents to be cached in the shared cache. The command make install will install the shared library, manpages and the nocache, cachestats and cachedel commandsunder /usr/local. If /assets/ files are suitable for storing in a shared cache, you also need one of public, s-maxage or must-revalidate. If a cache has a stored response, even a stale one, it will be returned.
Some intermediaries transform content for various reasons. If a cache doesn’t support must-understand, it will be ignored. Must-understand should be coupled with no-store for fallback behavior. You can use the public directive to unlock that restriction. Caches are encouraged to treat the value as if it were 0 (this is noted in the Calculating Freshness Lifetime section of the HTTP specification). Usually, the revalidation is done through a conditional request.
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Use a no-cache to make sure that the HTML response itself is not cached. If no cached response is available, a 504 Gateway Timeout response will be returned. The client indicates that an already-cached response should be returned.
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With nocache, the original caching state will be preserved. Please note that nocache will only build on a system that hassupport for the posix_fadvise syscall and exposes it, too. The nocache tool tries to minimize the effect an application has onthe Linux file system cache. Cache storage is allowed to cache it heuristically — so if you have any requirements on caching, you should always indicate them explicitly, in the Cache-Control header. If you don’t add a Cache-Control header because the response is not intended to be cached, that could cause an unexpected result. No-cache could cause revalidation, https://academyfedcamping.com/ and the client will correctly receive a new version of the HTML response and static assets.
The platform presents its users with several built-in editing tools, which allow for fast integration of music, special effects, filters, and transitions in videos. The platform presents endless content based on your interests through its algorithm, which will keep you watchfully engaged for extended periods. TikTok is a social media platform for making and broadcasting brief video content, and viewing short videos. This doesn’t mean the resource can’t be cached; rather, it must be revalidated each time it is requested. If you want to change this threshold, you can supply theenvironment variable NOCACHE_MAX_FDS and set it to a higher (or lower) value.It should specify a value one greater than the maximum file descriptor thatwill be handled by nocache.
The HTTP Cache-Control header holds directives (instructions) in both requests and responses that control caching in browsers and shared caches (e.g., Proxies, CDNs). If you don’t want a response stored in caches, use the no-store directive. The no-cache request directive asks caches to validate the response with the origin server before reuse. 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. The public response directive indicates that the response can be stored in a shared cache. The private response directive indicates that the response can be stored only in a private cache (e.g., local caches in browsers).
HTTP allows caches to reuse stale responses when they are disconnected from the origin server. No-cache allows caches to store a response but requires them to revalidate it before reuse. It does this by requiring caches to revalidate each request with the origin server. Ask the origin server whether or not the stored response is still fresh. If you consider nocache cat , in most (all?) cases the cache will not be restored. Adding no-cache to the response causes revalidation to the server, so you can serve a fresh response every time — or if the client already has a new one, just respond 304 Not Modified.
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Also, you can use vmstat 1 to view cache statistics. Portions of this content are ©1998–2026 by individual mozilla.org contributors. This page was last modified on Nov 16, 2025 by MDN contributors. For content that’s generated dynamically, or that’s static but updated often, you want a user to always receive the most up-to-date version. When you build static assets with versioning/hashing mechanisms, adding a version/hash to the filename or query string is a good way to manage caching.
In theory, if directives are conflicted, the most restrictive directive should be honored. Caches are encouraged to treat the value as if it were 0. Many browsers use this directive for reloading, as explained below. After the stale-if-error period passes, the client will receive any error generated.
Browsers usually add no-cache to requests when users are force reloading a page. The stale-if-error response directive indicates that the cache can reuse a stale response when an upstream server generates an error, or when the error is generated locally. The stale-while-revalidate response directive indicates that the cache could reuse a stale response while it revalidates it to a cache. If a request doesn’t have an Authorization header, or you are already using s-maxage or must-revalidate in the response, then you don’t need to use public. Must-revalidate is a way to prevent this from happening – either the stored response is revalidated with the origin server or a 504 (Gateway Timeout) response is generated.
This section lists directives that affect caching — both response directives and request directives. It is a criterion for whether a response is fresh or stale. Store a response in caches when the response is cacheable. Implementation that holds requests and responses for reusing in subsequent requests. Take a spin today on your computer and find out why slots players prefer Gambino Slots.
Clients can use this header when the user requires the response to not only be fresh, but also requires that it won’t be updated for a period of time. In the example above, the response is fresh for 7 days (604800s). Revalidation will make the cache be fresh again, so it appears to clients that it was always fresh during that period — effectively hiding the latency penalty of revalidation from them.
For debugging purposes, you can specify a filename that nocache should logdebugging messages to via the -D command line switch, e.g. use nocache -D /tmp/nocache.log …. When you update the library or edit the picture, new content should have a new URL, and caches aren’t reused. You can add a long max-age value and immutable because the content will never change.
Note that the major browsers do not support requests with min-fresh. When you use a cache-busting pattern for resources and apply them to a long max-age, you can also add immutable to avoid revalidation. When a user reloads the browser, the browser will send conditional requests for validating to the origin server. The immutable response directive indicates that the response will not be updated while it’s fresh.
