maxage31536000

Maxage31536000 denotes the numeric value 31536000, representing the number of seconds in approximately one year. In caching contexts, this value is used as the max-age directive to define how long a response should be considered fresh by caches.

In HTTP caching, a response can include a header such as Cache-Control: max-age=31536000. This tells caches (browsers, intermediate proxies) that the resource may be served from the cache without revalidation for up to 31536000 seconds from the time of the request. Because 31536000 seconds equates to roughly 365 days, this setting is commonly applied to static assets that are versioned or otherwise unlikely to change without a corresponding URL change.

Using a long max-age has advantages, including reduced bandwidth usage and faster load times on repeat visits. It also relies on proper cache invalidation practices, such as versioned URLs or fingerprints in asset filenames, to ensure users don’t receive stale content when updates occur. Conversely, applying a long max-age to resources that change without URL changes can lead to serving outdated content until the cache expires.

Best practices suggest pairing a long max-age with immutable or versioned resources; for assets that may update without a URL change, shorter cache durations or explicit invalidation mechanisms are safer. In modern deployments, developers may combine max-age=31536000 with directives like immutable to indicate that the resource will not change and should not be revalidated.