Internet Printing Protocol/1.1: IPP URL Scheme

Internet Printing Protocol/1.1: Model and Semantics

“…Note: "Internet Printing Protocol/1.1: IPP URL Scheme" [RFC3510] and "Internet Printing Protocol (IPP) over HTTPS Transport Binding and the 'ipps' URI Scheme" [RFC7472] define the mapping of IPP onto HTTP and HTTPS, respectively, and define and register a default port number.…”

Internet Printing Protocol (IPP) over HTTPS Transport Binding and the 'ipps' URI Scheme

“…This document defines an alternate IPP transport binding to that defined in the original IPP URL Scheme [RFC3510], but this document does not update or obsolete [RFC3510].…”

“…Per PWG "IPP Everywhere" [PWG5100.14], for compatibility with existing IPP implementations, IPP Printers SHOULD NOT generate 'ipp' [RFC3510] or 'ipps' URI (or allow administrators to configure) lengths above 255 octets, because many older IPP Client implementations do not properly support these lengths.…”

“…Note: The "query" production does not have defined semantics in IPP and was never used in examples in the IPP/1.1 Encoding and Transport document [RFC2910] or the original IPP URL Scheme [RFC3510]. The "query" is retained here for consistency, but IPP Clients SHOULD avoid its use (because the semantics would be implementation defined).…”

“…Therefore, port 631 is used for both 'ipp' [RFC3510] and 'ipps' URIs, which both refer to an IPP Printer or a network resource managed by an IPP Printer. IPP Printer implementors can refer to the CUPS [CUPS] source code for an example of incoming connection handling for the dual use of port 631.…”