describes a simplified model with abstract objects, their attributes,
   and their operations that are independent of encoding and transport.
   It introduces a Printer and a Job object. The Job object optionally
   supports multiple documents per Job. It also addresses security,
   internationalization, and directory issues.

   This document "Internet Printing Protocol/1.0: Implementer's Guide",
   gives advice to implementers of IPP clients and IPP objects.






 
RFC 2565            IPP/1.0: Encoding and Transport           April 1999


   The document "Mapping between LPD and IPP Protocols" gives some
   advice to implementers of gateways between IPP and LPD (Line Printer
   Daemon) implementations.

Table of Contents

   1. Introduction.....................................................4
   2. Conformance Terminology..........................................4
   3. Encoding of  the Operation Layer.................................4
      3.1  Picture of the Encoding.....................................5
      3.2  Syntax of Encoding..........................................7
      3.3  Version-number..............................................9
      3.4  Operation-id................................................9
      3.5  Status-code.................................................9
      3.6  Request-id..................................................9
      3.7  Tags.......................................................10
         3.7.1 Delimiter Tags.........................................10
         3.7.2 Value Tags.............................................11
      3.8  Name-Length................................................13
      3.9  (Attribute) Name...........................................13
      3.10 Value Length...............................................16
      3.11 (Attribute) Value..........................................16
      3.12 Data.......................................................18
   4. Encoding of Transport Layer.....................................18
   5. Security Considerations.........................................19
      5.1  Using IPP with SSL3........................................19
   6. References......................................................20
   7. Authors' Addresses..............................................22
   8. Other Participants:.............................................24
   9. Appendix A: Protocol Examples...................................25
      9.1  Print-Job Request..........................................25
      9.2  Print-Job Response (successful)............................26
      9.3  Print-Job Response (failure)...............................27
      9.4  Print-Job Response (success with attributes ignored).......28
      9.5  Print-URI Request..........................................30
      9.6  Create-Job Request.........................................31
      9.7  Get-Jobs Request...........................................31
      9.8  Get-Jobs Response..........................................32
   10. Appendix C: Registration of MIME Media Type Information for
       "application/ipp"..............................................35
   11. Full Copyright Statement.......................................37











 
RFC 2565            IPP/1.0: Encoding and Transport           April 1999


1. Introduction

   This document contains the rules for encoding IPP operations and
   describes two layers: the transport layer and the operation layer.

   The transport layer consists of an  HTTP/1.1 request or response. RFC
   2068 [RFC2068] describes HTTP/1.1. This document specifies the HTTP
   headers that an IPP implementation supports.

   The operation layer consists of  a message body in an HTTP request or
   response.  The document "Internet Printing Protocol/1.0: Model and
   Semantics" [RFC2566] defines the semantics of such a message body and
   the supported values. This document specifies the encoding of an IPP
   operation. The aforementioned document [RFC2566] is henceforth
   referred to as the "IPP model document"

2. Conformance Terminology

   The key words "MUST", "MUST NOT", "REQUIRED", "SHOULD", "SHOULD NOT",
   "RECOMMENDED", "MAY", and  "OPTIONAL" in this document are to be
   interpreted as described in RFC 2119 [RFC2119].

3. Encoding of  the Operation Layer

   The operation layer MUST contain a single operation request or
   operation response.  Each request or response consists of a sequence