Man pages matching name anyevent::httpd::httpserver in section 3pm:

AnyEvent::HTTPD::HTTPServer.3pm.en	debian 10 / libanyevent-httpd-perl
AnyEvent::HTTPD::HTTPServer.3pm.en	debian 11 / libanyevent-httpd-perl
AnyEvent::HTTPD::HTTPServer.3pm.en	debian 12 / libanyevent-httpd-perl