What is Max-age in Cache-Control?
What is Max-age in Cache-Control?
max-age. The max-age=N response directive indicates that the response remains fresh until N seconds after the response is generated. Cache-Control: max-age=604800. Indicates that caches can store this response and reuse it for subsequent requests while it’s fresh.
How do I change my Cache-Control max-age?
Cache-Control: max-age= This directive tells the browser or intermediary cache how long the response can be used from the time it was requested. A max-age of 3600 means that the response can be used for the next 60 minutes before it needs to fetch a new response from the origin server.
What is Max-age in HTTP header?
max-age. The max-age directive states the maximum amount of time in seconds that fetched responses are allowed to be used again (from the time when a request is made). For instance, max-age=90 indicates that an asset can be reused (remains in the browser cache) for the next 90 seconds.
How long does a cache last?
If a user stops using the browser it is indefinitely. If he/she uses the browser rarely, it will be until the expiration – either by internal policy or by HTTP headers. If he/she uses the browser heavily, it can be 12 minutes or even less.
What is Max-age?
Cache-Control: Max-Age The max-age request directive defines, in seconds, the amount of time it takes for a cached copy of a resource to expire. For 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.
What’s the difference between Max-age and expires?
Quick Answer: Expires sets an expiry date for when a cookie gets deleted. Max-age sets the time in seconds for when a cookie will be deleted (use this, it’s no longer 2009)
How do I setup a Cache-Control directive?
To use cache-control in HTML, you use the meta tag, e.g. The value in the content field is defined as one of the four values below. HTTP 1.1. Allowed values = PUBLIC | PRIVATE | NO-CACHE | NO-STORE.
How long is Max age 31536000?
one year
It’s standard practice to set a Cache-Control: max-age=31536000 on assets which are expected not to change, such as images. This header instructs the browser to cache the asset for 31536000 seconds, which is one year.
What is Max age?
Cache-control: max-age It is the maximum amount of time specified in the number of seconds. For example, max-age=90 means that a HTTP response remains in the browser as a cached copy for the next 90 seconds before it can be available for reuse.
How does cache-control no-cache work?
cache-control: no-cache This directive means that cached versions of the requested resource cannot be used without first checking to see if there is an updated version. If not, this means that the resource has been updated and the client will need to download a fresh version to provide to the user.
How do I adjust cache-control without cache?
Should I use Max-age or expires?
Quick Answer: Expires sets an expiry date for when a cookie gets deleted. Max-age sets the time in seconds for when a cookie will be deleted (use this, it’s no longer 2009) Internet Explorer (ie6, ie7, and ie8) does not support “max-age”, while (mostly) all browsers support expires.
What does the header Cache-Control max-age = 0 mean?
The header Cache-Control: max-age=0 implies that the content is considered stale (and must be re-fetched) immediately, which is in effect the same thing as Cache-Control: no-cache.
How is cache control used in HTTP 1.1?
The Cache-Control header is used in HTTP 1.1 to control the behavior of caches. The max-age directive is used to specify (in seconds) the maximum age of the content before it becomes stale (i.e., the content will not change for some period of time).
When to use the max-age directive in a cache?
max-age When an intermediate cache is forced, by means of a max-age=0 directive, to revalidate its own cache entry, and the client has supplied its own validator in the request, the supplied validator might differ from the validator currently stored with the cache entry.
When to revalidate cache after max-age expiry?
After max-age expiry (that is expiry from cache), is there a If-Modified-Since check or is content re-downloaded from origin server w/o If-Modified-Since check? it is telling both client caches and proxy caches that once the content is stale (older than 3600 seconds) they must revalidate at the origin server before they can serve the content.
