A DNS Resource Record for HTTP
draft-bellis-dnsop-http-record-00

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DNSOP Working Group                                            R. Bellis
Internet-Draft                                                       ISC
Intended status: Standards Track                       November 04, 2018
Expires: May 8, 2019

                     A DNS Resource Record for HTTP
                   draft-bellis-dnsop-http-record-00

Abstract

   This document specifies an "HTTP" resource record type for the DNS to
   facilitate the lookup of the server hostname of HTTP(s) URIs.  It is
   intended to replace the use of CNAME records for this purpose, and in
   the process provides a solution for the inability of the DNS to allow
   a CNAME to be placed at the apex of a domain name.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
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   Drafts is at https://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
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   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on May 8, 2019.

Copyright Notice

   Copyright (c) 2018 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
   (https://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
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   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.

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  Description . . . . . . . . . . . . . . . . . . . . . . . . .   3
     3.1.  Wire Format . . . . . . . . . . . . . . . . . . . . . . .   3
     3.2.  Presentation Format . . . . . . . . . . . . . . . . . . .   3
     3.3.  Server Operation  . . . . . . . . . . . . . . . . . . . .   4
     3.4.  Client Operation  . . . . . . . . . . . . . . . . . . . .   4
   4.  Security Considerations . . . . . . . . . . . . . . . . . . .   4
   5.  Implementation status . . . . . . . . . . . . . . . . . . . .   4
   6.  Privacy Considerations  . . . . . . . . . . . . . . . . . . .   4
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   5
   8.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   5
   9.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   5
     9.1.  Normative References  . . . . . . . . . . . . . . . . . .   5
     9.2.  Informative References  . . . . . . . . . . . . . . . . .   5
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .   5

1.  Introduction

   It is very common for HTTP(s) URIs to contain a domain name that is
   not the same as the hostname of the actual server that hosts the
   content.

   This is typically achieved via a CNAME record where the owner name of
   that record (the "Alias") is the domain name from the URI and the
   Canonical name field in its RDATA corresponds with the target
   hostname (although it should be noted that this strictly a violation
   of the original design semantics of the CNAME record).

   It is also impossible to store a CNAME at the apex of a domain name,
   which causes signficant difficulties if you wish to redirect your
   domain name without a "www" prefix to a content delivery network
   (CDN).  The only portable solution at the moment is to determine the
   IP address records of the content host and insert them directly at
   the apex of the zone, but this is brittle, and prevents the correct
   operation of typical CDN features.

   While there have been previous attempts to promote the use of the SRV
   record instead of CNAME records, there have been concerns raised
   about the performance impact of the additional DNS lookup an SRV
   record would typically require.

   To achieve equivalent end-user performance as existing CNAME-based
   solutions, this document permits recursive resolvers to pre-emptively
   look up the target of an HTTP Record and return the corresponding

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