Module filters 

Utility functions to help process HTTP headers for caching

Modules

upstream

Filters to run when sending requests to upstream

Functions

calculate_expires_header_time

Calculate the expire time from the Expires header only

calculate_fresh_until

Calculate the SystemTime at which the asset expires

calculate_serve_stale_durations

Calculates stale-while-revalidate and stale-if-error seconds from Cache-Control or the CacheMetaDefaults.

request_cacheable

Decide if the request can be cacheable

resp_cacheable

Decide if the response is cacheable.