The no-store response directive indicates that any caches of any kind should not store this response. This section lists directives that affect caching — both response directives and request directives. As web developers, we’re used to setting the page description, author, or keyword via meta tag. However, there are a number of meta tag capabilities that most of us probably aren’t aware of.
If no request happened during that period, the cache became stale and the next request will revalidate normally. If a cache supports must-understand, it stores the response with an understanding of cache requirements based on its status code. If a cache doesn’t support must-understand, it will be ignored. If no-store is also present, the response isn’t stored. You can also set an expiration date to ensure that the browser will show the file that’s fresh from the server, rather than from the cache. Build around the perfect keywords attracting the right customers. We’ve made it simple for you by offering you this free meta-tags wizard.
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They also improve user experience, especially on mobile, which is a good enough reason in itself to do it. To answer your specific question, these headers may negatively affect performance because they may prevent caching, and caching is good for performance. But in practice they probably make little difference. I see many websites, seemingly arbitrarily adding the no cache meta tag on every page. 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.
Where is the cache located?
Temporary file is a common type of cache in your computer. By default, temporary files are stored in the path of C:\Users\Admin\AppData\Local\Temp. To clear them, you can press Windows + R to open Run window, input %temp% and click OK to open the Temp folders. Then, delete all the temporary files and folders in it.
You can add a long max-age value and immutable because the content will never change. The React library version will change when you update the library, and hero.png will also change when you edit the picture. So those are hard to store in a cache with max-age.
After 7 days it becomes stale, but the cache is allowed to reuse it for any requests that are made in the following day , provided that they revalidate the response in the background. The stale-while-revalidate response directive indicates that the cache could reuse a stale response while it revalidates it to a cache. Note that max-age is not the elapsed time since the response was received; it is the elapsed time since the response was generated on the origin server. So if the other cache — on the network route taken by the response — store the response for 100 seconds , the browser cache would deduct 100 seconds from its freshness lifetime. Stale response Indicates that the response is a stale response. This usually means the response can’t be reused as-is.
The proxy-revalidate response directive is the equivalent of must-revalidate, but specifically for shared caches only. The meta cache control tag allows Web publishers to define how pages should be handled by caches. They include directives to declare what should be cacheable, what may be stored by caches, modifications of the expiration mechanism, and re-validation and reload controls. Page caching is valuable for both SEO and user experience. This means a user sees the content faster, which reduces abandonment rates – especially on mobile devices. Imagine that clients/caches store a fresh response for a path, with no request flight to the server. Unfortunately, there are no cache directives for clearing already-stored responses from caches.
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Meta Tag is used to store a piece of information on a web page. Its purpose is for browsers and search engines to understand and know the page better. I’ll keep this in mind if I have any issues with web proxies, but my “team” keeps me completely on the front-end and give me no access to the headers. Asking for help, clarification, or responding to other answers. Very few web pages themselves are explicitly cached. We all cache CSS/JS/images and often forget about the HTML. The accepted answer is verbatim to the above, but it looks to not be recommended practice.
- We all cache CSS/JS/images and often forget about the HTML.
- 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.
- The must-revalidate response directive indicates that the response can be stored in caches and can be reused while fresh.
- The accepted answer is verbatim to the above, but it looks to not be recommended practice.
A combination of bobince and dpb’s answers is your best bet.
HTTP allows caches to reuse stale responses when they are disconnected from the origin server. Must-revalidate is a way to prevent this from happening – either the stored response is revalidated with the origin server or a 504 response is generated. The must-revalidate response directive indicates that the response can be stored in caches and can be reused while fresh.
How do I view cache files?
Hold down the Alt (Option) key. You’ll see the Library folder show up in the drop-down menu. Find the Caches folder and then your browser’s folder to see all the cached files stored on your computer.
Use a no-cache to make sure that the HTML response itself is not cached. No-cache could cause revalidation, and the client will correctly receive a new version of the HTML response and static assets. After a period of time, the stored response became stale normally. This means that the client will receive an error response as-is if the origin server sends it. 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 , and it’s fundamentally not shared-cacheable, even if it has max-age. If you want caches to always check for content updates while reusing stored content, no-cache is the directive to use.
For dynamically generated content the headers would be there to try and ensure site visitors are always hitting the server and so are always getting up-to-the minute content. 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. If you don’t want a response stored in caches, use the no-store directive. Browsers usually add no-cache to requests when users are force reloading a page. No-cache allows clients to request the most up-to-date response even if the cache has a fresh response. 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.
Note that the major browsers do not support requests with min-fresh. Many browsers use this directive for reloading, as explained below. Note that the major browsers do not support requests with no-store.
Meta equiv cache-control
I think if Browsersync can wrangle that, then we use that instead. 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.