Registration Data Access Protocol (RDAP) Partial Response
RFC 8982

Document Type RFC - Proposed Standard (February 2021; No errata)
Authors Mario Loffredo  , Maurizio Martinelli 
Last updated 2021-02-09
Replaces draft-loffredo-regext-rdap-partial-response
Stream Internent Engineering Task Force (IETF)
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Stream WG state Submitted to IESG for Publication
Document shepherd Jasdip Singh
Shepherd write-up Show (last changed 2020-05-08)
IESG IESG state RFC 8982 (Proposed Standard)
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Consensus Boilerplate Yes
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Responsible AD Barry Leiba
Send notices to Jasdip Singh <>
IANA IANA review state Version Changed - Review Needed
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Internet Engineering Task Force (IETF)                       M. Loffredo
Request for Comments: 8982                                 M. Martinelli
Category: Standards Track                            IIT-CNR/
ISSN: 2070-1721                                            February 2021

       Registration Data Access Protocol (RDAP) Partial Response


   The Registration Data Access Protocol (RDAP) does not include
   capabilities to request partial responses.  Servers will only return
   full responses that include all of the information that a client is
   authorized to receive.  A partial response capability that limits the
   amount of information returned, especially in the case of search
   queries, could bring benefits to both clients and servers.  This
   document describes an RDAP query extension that allows clients to
   specify their preference for obtaining a partial response.

Status of This Memo

   This is an Internet Standards Track document.

   This document is a product of the Internet Engineering Task Force
   (IETF).  It represents the consensus of the IETF community.  It has
   received public review and has been approved for publication by the
   Internet Engineering Steering Group (IESG).  Further information on
   Internet Standards is available in Section 2 of RFC 7841.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at

Copyright Notice

   Copyright (c) 2021 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   ( in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction
     1.1.  Conventions Used in This Document
   2.  RDAP Path Segment Specification
     2.1.  Subsetting Metadata
       2.1.1.  RDAP Conformance
       2.1.2.  Representing Subsetting Links
   3.  Dealing with Relationships
   4.  Basic Field Sets
   5.  Negative Answers
   6.  IANA Considerations
   7.  Security Considerations
   8.  References
     8.1.  Normative References
     8.2.  Informative References
   Appendix A.  Approaches to Partial Response Implementation
     A.1.  Specific Issues Raised by RDAP
   Authors' Addresses

1.  Introduction

   The use of partial responses in RESTful API [REST] design is very
   common.  The rationale is quite simple: instead of returning objects
   in API responses with all data fields, only a subset of the fields in
   each result object is returned.  The benefit is obvious: less data
   transferred over the network means less bandwidth usage, faster
   server responses, less CPU time spent both on the server and the
   client, and less memory usage on the client.

   Currently, RDAP does not provide a client with any way to request a
   partial response.  Servers can only provide the client with a full
   response [RFC7483].  Servers cannot limit the amount of information
   returned in a response based on a client's preferences, and this
   creates inefficiencies.

   The protocol described in this specification extends RDAP search
   capabilities to enable partial responses through the provisioning of
   predefined sets of fields that clients can submit to an RDAP service
   by adding a new query parameter.  The service is implemented using
   the Hypertext Transfer Protocol (HTTP) [RFC7230] and the conventions
   described in [RFC7480].

1.1.  Conventions Used in This Document

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "OPTIONAL" in this document are to be interpreted as described in
   BCP 14 [RFC2119] [RFC8174] when, and only when, they appear in all
   capitals, as shown here.

2.  RDAP Path Segment Specification

   The path segment defined in this section is an OPTIONAL extension of
   search path segments defined in [RFC7482].  This document defines an
   RDAP query parameter, "fieldSet", whose value is a non-empty string
   identifying a server-defined set of fields returned in place of the
   full response.  The field sets supported by a server are usually
   described in out-of-band documents (e.g., RDAP profile) together with
   other features.  Moreover, this document defines in Section 2.1 an
   in-band mechanism by means of which servers can provide clients with
   basic information about the supported field sets.

   The following is an example of an RDAP query including the "fieldSet"
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