http://www.rfc-editor.org/rfc/rfc7472.txt
RFC 7472: Internet Printing Protocol (IPP) over HTTPS Transport Binding and the 'ipps' URI Scheme, I. McDonald, M. Sweet2015-03-01T23:00:00-00:00This document defines an alternate IPP transport binding to that defined in the original IPP URL Scheme (RFC 3510), but this document does not update or obsolete RFC 3510.