regex Adding ?nocache=1 to every url including the assets like stylesheet behind the scenes using mod rewrite

Caching headers are unreliable in meta elements; for one,any web proxies between the site and the user will completely ignorethem. You should always use a real HTTP header for headers such asCache-Control and Pragma. Note that the major browsers do not support requests with min-fresh. No-transform indicates that any intermediary (regardless of whether it implements a cache) shouldn’t transform the response contents. If a cache doesn’t support must-understand, it will be ignored. Note that s-maxage or must-revalidate also unlock that restriction.

If you forget to add private to a response with personalized content, then that response can be stored in a shared cache and end up being reused for multiple users, which can cause personal information to leak. There are no cache directives for clearing already-stored responses from caches on intermediate servers. 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. Here, an error is considered any response with a status code of 500, 502, 503, or 504. When a user reloads the browser, the browser will send conditional requests for validating to the origin server.

The Cache-Control header is used to specify directives for caching mechanisms in both HTTP requests and responses. If you don’t add a Cache-Control header because the response is not intended to be cached, that could cause an unexpected result. 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. 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.

Request Directives

In such a case, you could address the caching needs by using a specific, numbered version of the library, and including the hash of the picture in its URL. Note that the major browsers do not support requests with max-stale. After the stale-if-error period passes, the client will receive any error generated. If no request happened during that period, the cache became stale and the next request will revalidate normally. 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. This Express middleware sets some HTTP response headers to try to disable client-side caching.

Directives

The immutable response directive indicates that the response will not be updated while it’s fresh. However, cacheing headers are unreliable in meta elements; for one, any web proxies between the site and the user will completely ignore them. You should always use a real HTTP header for headers such as Cache-Control and Pragma.

This feature is well established and works across many devices and browser versions. By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy. Alright, this is due to the pain that godaddy gives me by implementing their own caching in a MANAGED WORDPRESS hosting.

stale-if-error

• 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.
• Responses for requests with Authorization header fields must not be stored in a shared cache; however, the public directive will cause such responses to be stored in a shared cache.
• 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.
• If the sense of “don’t cache” that you want is actually “don’t store”, then no-store is the directive to use.
• You should always use a real HTTP header for headers such as Cache-Control and Pragma.

The no-cache request directive asks caches to validate the response with the origin server before reuse. The must-understand response directive indicates that a cache should store the response only if it understands the requirements for caching based on status code. 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. The no-store response directive indicates that any caches of any kind (private or shared) should not store this response.

• These are completely outdated when using modern up to date browsers.After IE9 anyway.
• The public response directive indicates that the response can be stored in a shared cache.
• Imagine that clients/caches store a fresh response for a path, with no request flight to the server.
• The must-understand response directive indicates that a cache should store the response only if it understands the requirements for caching based on status code.

Cache directive “no-cache”

In the browser, I get a cached version of the stylesheet which does not reflect the recent one. Also, there is no setting to enable “development mode” which apparently turns off caching on the godaddy control panel. Many browsers use this directive for reloading, as explained below.

If a cache supports must-understand, it stores the response with an understanding of cache requirements based on its status code. This section lists directives that affect caching — both response directives and request directives. You can add a long max-age value and immutable because the content will never change.

When you build static assets with versioning/hashing mechanisms, adding a version/hash mining benchmark tool to the filename or query string is a good way to manage caching. No-cache allows clients to request the most up-to-date response even if the cache has a fresh response. 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.

The public response directive indicates that the response can be stored in a shared cache. Responses for requests with Authorization header fields must not be stored in a shared cache; however, the public directive will cause such responses to be stored in a shared cache. Cache storage isn’t required to remove stale responses immediately because revalidation could change the response from being stale to being fresh again.

Browsers usually add no-cache to requests when users are force reloading a page. No-cache allows caches to store a response but requires them to revalidate it before reuse. If the sense of “don’t cache” that you want is actually “don’t store”, then no-store is the directive to use. When you update the library or edit the picture, new content should have a new URL, and caches aren’t reused.

The client indicates that an already-cached response should be returned. If a cache has a stored response, even a stale one, it will be returned. If no cached response is available, a 504 Gateway Timeout response will be returned. The no-store request directive allows a client to request that caches refrain from storing the request and corresponding response — even if the origin server’s response could be stored. In general, when pages are under Basic Auth or Digest Auth, the browser sends requests with the Authorization header. 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.

Caching static assets with “cache busting”

Usually, the revalidation is done through a conditional request. 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. The stale-if-error request directive indicates that the browser is interested in receiving stale content on error from any intermediate server for a particular origin.This is not supported by any browser (see Browser compatibility). 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.

It does this by requiring caches to revalidate each request with the origin server. The no-cache response directive indicates that the response can be stored in caches, but the response must be validated with the origin server before each reuse, even when the cache is disconnected from the origin server. This usually means the response can be reused for subsequent requests, depending on request directives. Ask the origin server whether or not the stored response is still fresh.