5.5 Regex in URL remapping ¶

You can use regular expressions as a URL rule argument.

(use-modules (artanis artanis))
(init-server)
(get "/.+\\.(png|gif|jpeg)" static-page-emitter)
(run #:port 8080)

static-page-emitter is a GNU Artanis API that sends a static file (images, data files) to the client.