Unlimited Caching: A Guide to Storing HTTP Responses permanently

Is there a way to send an HTTP response that will be cached by any client indefinitely, so that the browser can retrieve it from the local file system without making any new HTTP requests when needed?

Just imagine using this for versioned client code in an Ajax application. Simply access everything through example.com/front.htm, which doesn't change as it contains a script tag linking to example.com/currentversion/bootstrap.js that is stored in the cache forever. With this setup, the client won't need to update scripts because the uncacheable HTML file determines the current version.

javascriptajaxhttpcaching

Answer №1

The RFC states that in order to designate a response as 'never expires,' an origin server should set an Expires date roughly one year from when the response is sent. It is recommended that HTTP/1.1 servers do not assign Expires dates beyond one year in advance.

For more information, refer to http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.21.

I am unsure of the rationale behind the one-year restriction, so please consider this information carefully.

Answer №2

The caching period extends until the year 2038. After that point, reliability is compromised due to the32-bit Unix Epoch bug. To address this issue, include the following header:

Expires: Sun, 17 Jan 2038 19:14:07 GMT

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