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_sec
  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.