Man pages matching name www::oauth::request::http_request in section 3pm:

WWW::OAuth::Request::HTTP_Request.3pm.en	debian 10 / libwww-oauth-perl
WWW::OAuth::Request::HTTP_Request.3pm.en	debian 11 / libwww-oauth-perl
WWW::OAuth::Request::HTTP_Request.3pm.en	debian 12 / libwww-oauth-perl