Man pages matching name http::body::xformsmultipart in section 3pm:

HTTP::Body::XFormsMultipart.3pm.en	debian 10 / libhttp-body-perl
HTTP::Body::XFormsMultipart.3pm.en	debian 11 / libhttp-body-perl
HTTP::Body::XFormsMultipart.3pm.en	debian 12 / libhttp-body-perl