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RFC 7252, "The Constrained Application Protocol (CoAP)", June 2014

Source of RFC: core (app)

Errata ID: 4895
Status: Reported
Type: Editorial

Reported By: Esko Dijk
Date Reported: 2016-12-23

Section 6.4 says:

Note that these rules completely resolve any percent-encoding.

It should say:

Note that these rules completely resolve any percent-encoding. Also 
note that a trailing slash character in the <path> component represents
a separate, zero-character path segment (see [RFC3986] Section 3.3 
ABNF) and therefore it is encoded using a Uri-Path Option of zero
length.

Notes:

The current specification for decomposing a URI into CoAP Options (Section 6.4) is correct; however the text may still be unclear to implementers who may think that the phrase "not including the delimiting slash characters" means simply omitting a trailing slash character in the URI path. This is incorrect. See the discussion outcome in email thread https://www.ietf.org/mail-archive/web/core/current/msg08223.html . Therefore, a minor clarification is proposed in the notes after the parsing steps.

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