noir.statuses documentation
If no pages are defined that match a request, a status page is used based on the the HTTP status code of the response. This contains the function necessary to get or set these status pages.
get-page
(get-page code)
Gets the content to display for the given status code
set-page!
(set-page! code content)
Sets the content to be displayed if there is a response with the given status code. This is used for custom 404 pages, for example.