The (www data http-status) module exports a single procedure:
Here is a simple example using this module:
(use-modules ((www data http-status)
#:select (http-status-string)))
(define (h2 n)
(format #f "<H2>~A ~A</H2>"
n (http-status-string n)))
(h2 404) ⇒ "<H2>404 Not Found</H2>"
(h2 307) ⇒ "<H2>307 Temporary Redirect</H2>"