Can HTTP control caching?

Can HTTP control caching?

The Cache-Control HTTP header holds directives (instructions) for caching in both requests and responses. A given directive in a request does not mean the same directive should be in the response.

What is Cache Control HTTP 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).

How does HTTP support caching?

HTTP supports caching so that content can be stored locally by the browser and reused when required. Browser caching is controlled by the use of the Cache-Control, Last-Modified and Expires response headers.

How to prevent browser caching using HTTP headers?

Cache-Control ‘No-Store’ & ‘No-Cache’ Header Settings. A “Cache-Control” setting of private instructs any proxies not to cache the page but it does still permit the browser to cache. Changing this to no-store instructs the browser to not cache the page and not store it in a local cache. This is the most secure setting.

How does caching work in different web browsers?

Different web browsers implement caching in differing ways and therefore also implement various subtleties in their support for the cache controlling HTTP headers. This also means that as browsers evolve so too will their implementations related to these header values.

Is the pragma header the same as the Cache Control header?

Pragma is a HTTP/1.0 header, it is not specified for HTTP responses and is therefore not a reliable replacement for the general HTTP/1.1 Cache-Control header, although it does behave the same as Cache-Control: no-cache, if the Cache-Control header field is omitted in a request.

What is the purpose of the Cache Control header?

The Cache-Control header has a lot of other directives to control the cache behavior. To specify the time for which the content can be cached, Cache-Control has a max-age directive. It defines a relative time in seconds for which the content can be cached.