masque B. Schwartz
Internet-Draft Google LLC
Intended status: Standards Track 4 October 2021
Expires: 7 April 2022
HTTP Datagram PING
draft-schwartz-masque-h3-datagram-ping-01
Abstract
This draft defines an HTTP Datagram Format Type for measuring the
functionality of a Datagram path.
Discussion Venues
This note is to be removed before publishing as an RFC.
Discussion of this document takes place on the mailing list
(masque@ietf.org), which is archived at
https://mailarchive.ietf.org/arch/browse/masque/.
Source for this draft and an issue tracker can be found at
https://github.com/bemasc/h3-datagram-ping.
Status of This Memo
This Internet-Draft is submitted in full conformance with the
provisions of BCP 78 and BCP 79.
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Internet-Drafts are draft documents valid for a maximum of six months
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This Internet-Draft will expire on 7 April 2022.
Copyright Notice
Copyright (c) 2021 IETF Trust and the persons identified as the
document authors. All rights reserved.
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Internet-Draft HTTP Datagram PING October 2021
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Table of Contents
1. Conventions and Definitions . . . . . . . . . . . . . . . . . 2
2. PING Datagram Format Type . . . . . . . . . . . . . . . . . . 2
2.1. Format . . . . . . . . . . . . . . . . . . . . . . . . . 2
2.2. Use . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
3. Use cases . . . . . . . . . . . . . . . . . . . . . . . . . . 3
4. IANA considerations . . . . . . . . . . . . . . . . . . . . . 3
5. References . . . . . . . . . . . . . . . . . . . . . . . . . 3
5.1. Normative References . . . . . . . . . . . . . . . . . . 3
5.2. Informative References . . . . . . . . . . . . . . . . . 4
Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . . 4
Author's Address . . . . . . . . . . . . . . . . . . . . . . . . 4
1. Conventions and Definitions
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
"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. PING Datagram Format Type
PING is an HTTP Datagram Format Type
[I-D.draft-ietf-masque-h3-datagram]. It has no Additional Data.
2.1. Format
PING Datagrams have the following format:
PING {
Sequence Number (i),
Opaque Data (..),
}
Figure 1: PING Datagram Format
All Sequence Number and Opaque Data values are potentially valid.
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2.2. Use
The sender emits a PING Datagram with any even Sequence Number and
any Opaque Data. Upon receiving a PING Datagram with an even
Sequence Number, the recipient MUST reply with a PING Datagram whose
Sequence Number is one larger, with empty Opaque Data.
Intermediaries MUST forward PING Datagrams without modification, just
like any other HTTP Datagram.
3. Use cases
PING Datagrams can be used to characterize the end-to-end HTTP
Datagram path associated with an HTTP request. For example, HTTP
endpoints can easily use PING Datagrams to estimate the round-trip
time and loss rate of the HTTP Datagram path.
PING Datagrams are also suitable for use as DPLPMTUD Probe Packets
[RFC8899]. This enables endpoints to estimate the HTTP Datagram MTU
of each Datagram path, in order to avoid sending HTTP Datagrams that
will be dropped.
Note that these path characteristics can differ from those inferred
from the underlying transport (e.g. QUIC), if the HTTP request
traverses one or more HTTP intermediaries (see Section 3.7 of
[I-D.draft-ietf-httpbis-semantics]).
4. IANA considerations
IANA is directed to add the following entry to the "HTTP Datagram
Format Types" registry:
* Type: PING
* Value: TBD
* Reference: (This document)
5. References
5.1. Normative References
[I-D.draft-ietf-masque-h3-datagram]
Schinazi, D. and L. Pardue, "Using Datagrams with HTTP",
Work in Progress, Internet-Draft, draft-ietf-masque-h3-
datagram-03, 12 July 2021,
<https://datatracker.ietf.org/doc/html/draft-ietf-masque-
h3-datagram-03>.
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[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119,
DOI 10.17487/RFC2119, March 1997,
<https://www.rfc-editor.org/rfc/rfc2119>.
[RFC8174] Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC
2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174,
May 2017, <https://www.rfc-editor.org/rfc/rfc8174>.
5.2. Informative References
[I-D.draft-ietf-httpbis-semantics]
Fielding, R. T., Nottingham, M., and J. Reschke, "HTTP
Semantics", Work in Progress, Internet-Draft, draft-ietf-
httpbis-semantics-19, 12 September 2021,
<https://datatracker.ietf.org/doc/html/draft-ietf-httpbis-
semantics-19>.
[RFC8899] Fairhurst, G., Jones, T., Tüxen, M., Rüngeler, I., and T.
Völker, "Packetization Layer Path MTU Discovery for
Datagram Transports", RFC 8899, DOI 10.17487/RFC8899,
September 2020, <https://www.rfc-editor.org/rfc/rfc8899>.
Acknowledgments
Thanks to Alex Chernyakhovsky for constructive input.
Author's Address
Benjamin Schwartz
Google LLC
Email: bemasc@google.com
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