W3C home > Mailing lists > Public > ietf-http-wg@w3.org > July to September 2018

[Technical Errata Reported] RFC7231 (5448)

From: RFC Errata System <rfc-editor@rfc-editor.org>
Date: Thu, 2 Aug 2018 06:31:36 -0700 (PDT)
To: fielding@gbiv.com, julian.reschke@greenbytes.de, ben@nostrum.com, aamelnikov@fastmail.fm, adam@nostrum.com, mnot@mnot.net, pmcmanus@mozilla.com
Cc: magnar@myrtveit.com, ietf-http-wg@w3.org, rfc-editor@rfc-editor.org
Message-Id: <20180802133136.C4D85B80F6B@rfc-editor.org>
The following errata report has been submitted for RFC7231,
"Hypertext Transfer Protocol (HTTP/1.1): Semantics and Content".

--------------------------------------
You may review the report below and at:
http://www.rfc-editor.org/errata/eid5448

--------------------------------------
Type: Technical
Reported by: Magnar Ovedal Myrtveit <magnar@myrtveit.com>

Section: 7.1.1.1

Original Text
-------------
Recipients of a timestamp value in rfc850-date format, which uses a
two-digit year, MUST interpret a timestamp that appears to be more
than 50 years in the future as representing the most recent year in
the past that had the same last two digits.

Corrected Text
--------------
Recipients of a timestamp value in rfc850-date format, which uses a
two-digit year, MUST interpret a timestamp that appears to be more
than 200 years in the future as representing the most recent date in
the past that also matches the timestamp.

Notes
-----
The combination of day-of-the-week, day-of-the-month, month, and the two last digits of the year repeats every 400 years. For example, "Friday, 01-Jan-00 00:00:00 GMT" (as formatted by rfc850) happens in the years ...1300, 1700, 2100, 2500, 2900...

With the original text, "Friday, 01-Jan-00 00:00:00 GMT" is interpreted as year 2000, since year 2100 is more than 50 years in the future, and year 2000 is the most recent year in the past with the same last two digits as 2100. However, if it really was year 2000, it should have said "Saturday, 01-Jan-00 00:00:00 GMT". So it would make more sense to interpret it as either year 1700 or year 2100. The corrected text interprets it as year 2100.

"Monday, 01-Jan-00 00:00:00 GMT" happens in years ...1100, 1500, 1900, 2300, 2700..., and is interpreted as year 1900, since 2300 is more than 200 years in the future.

Instructions:
-------------
This erratum is currently posted as "Reported". If necessary, please
use "Reply All" to discuss whether it should be verified or
rejected. When a decision is reached, the verifying party  
can log in to change the status and edit the report, if necessary. 

--------------------------------------
RFC7231 (draft-ietf-httpbis-p2-semantics-26)
--------------------------------------
Title               : Hypertext Transfer Protocol (HTTP/1.1): Semantics and Content
Publication Date    : June 2014
Author(s)           : R. Fielding, Ed., J. Reschke, Ed.
Category            : PROPOSED STANDARD
Source              : Hypertext Transfer Protocol Bis APP
Area                : Applications
Stream              : IETF
Verifying Party     : IESG
Received on Thursday, 2 August 2018 13:32:05 UTC

This archive was generated by hypermail 2.4.0 : Friday, 17 January 2020 17:15:23 UTC