Man pages matching name poe::filter::httphead in section 3pm:

POE::Filter::HTTPHead.3pm.en	debian 10 / libpoe-component-client-http-perl
POE::Filter::HTTPHead.3pm.en	debian 11 / libpoe-component-client-http-perl
POE::Filter::HTTPHead.3pm.en	debian 12 / libpoe-component-client-http-perl