What is Max-age in cache-control header?

What is Max-age in cache-control 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.

What is cache max-age?

A cache max-age is a positive integer, expressing a number of seconds. Cache max-ages are passed around as individual integers, because a given cache item can only logically have a single max-age. Examples: 60 means cacheable for 60 seconds.

How do I set expiration and cache-control max-age?

Cache-Control: Max-Age After expiring, a browser must refresh its version of the resource by sending another request to a server. 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.

How do I set up cache-control headers?

To use Cache-Control headers, choose Content Management | Cache Control Directives in the administration server. Then, using the Resource Picker, choose the directory where you want to set the headers. After setting the headers, click ‘OK’.

How long does a cache last?

The response can be cached by browsers and intermediary caches for up to 1 day (60 seconds x 60 minutes x 24 hours). The response can be cached by the browser (but not intermediary caches) for up to 10 minutes (60 seconds x 10 minutes). The response can be stored by any cache for 1 year.

How do I know when my cache expires?

Using the expiration model, there are two ways to determine whether a cache entry has expired:

  1. By checking the value of the Expires entity-header field against the Date value to see if the content has reached its expiration date.
  2. By checking the Cache-Control field for the max-age directive.

How do I know if Cache is working?

How to find out if your website cache is working correctly?

  1. A quick way of to test if your caching is enabled and working correctly on your website is by using the Cache Checker tool:
  2. If you use the Cache Checker tool, you will also receive the cache header response.

How do I set cache-control without store?

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.

What is default cache-control?

The default cache-control header is : Private. A cache mechanism may cache this page in a private cache and resend it only to a single client. This is the default value. Most proxy servers will not cache pages with this setting.

How do I force clear cache?

To ensure you see the latest version of a site you need to clear the cache memory. This is done by doing a force refresh by pressing both control and F5 buttons simultaneously on your keyboard (depending on your browser). Most times a simple force cache refresh won’t work and you need to clear the cache by hand.

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.

When to use Cache Control max age in CloudFront?

We recommend that you use the Cache-Control max-age directive instead of the Expires header field to control object caching. If you specify values both for Cache-Control max-age and for Expires , CloudFront uses only the value of Cache-Control max-age .

What does the Cache Control header in http mean?

What is the Cache-Control Header. Cache-control is an HTTP header used to specify browser caching policies in both client requests and server responses. Policies include how a resource is cached, where it’s cached and its maximum age before expiring (i.e., time to live).

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.