Directives/Middleware - http.expires - 《Caddy v1.0 Document》

expires allows you to set expiration header relative to the request time. It allows you to set different expiration durations base on a path matching a regular expression.

Syntax

match: a regular expression matching on path and an expiration duration. Match subdirective can be repeated as many times as you want but only the first matching will be used. Duration is a combination of 0y0m0d0h0i0s in that order. Parts can be omitted.

Expires various assets.

Expires based on header value

You can also match on the value of a RESPONSE header. Useful for content-type matching for instance.