Man pages matching name mime::base64::urlsafe in section 3pm:

MIME::Base64::URLSafe.3pm.en	debian 10 / libmime-base64-urlsafe-perl
MIME::Base64::URLSafe.3pm.en	debian 11 / libmime-base64-urlsafe-perl
MIME::Base64::URLSafe.3pm.en	debian 12 / libmime-base64-urlsafe-perl