Page not found (error 404)

The page http://postumia.altervista.org/Postumia_CAT-ITA_2022/files/basic-html/page17.html was not found on this server.

This can be due to:

Pay attetion to UPPER and LOWER cases
http://site.altervista.org/Page.html is different from http://site.altervista.org/page.html