The following errata report has been submitted for RFC6749,
"The OAuth 2.0 Authorization Framework".

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You may review the report below and at:
https://www.rfc-editor.org/errata/eid8790

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Type: Technical
Reported by: Filip Skokan <[email protected]>

Section: 3.1

Original Text
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Request and response parameters MUST NOT be included more than once.

Corrected Text
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Request and response parameters defined by this specification MUST NOT be 
included more than once. This requirement also applies to parameters defined by 
extensions unless the extension explicitly defines otherwise for a specific 
parameter.

Notes
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This builds upon verified erratum 5708 
(https://www.rfc-editor.org/errata/eid5708) which added "defined by this 
specification" to scope the restriction to parameters defined in RFC 6749 and 
not to extension-defined parameters. However, that change left ambiguity about 
what rules apply to extension parameters. Several extensions explicitly allow 
repeated parameters, e.g., the "resource" parameter in RFC 8707 Section 2 
("Multiple resource parameters MAY be used to indicate that the requested token 
is intended to be used at multiple resources.") and the "resource" and 
"audience" parameters in RFC 8693 Section 2.1. The added sentence makes clear 
that extension parameters default to not being repeated, unless the extension 
defining them explicitly allows it. See also: 
https://mailarchive.ietf.org/arch/msg/oauth/l3Yp2W4QXHdCXgO3NVpC6syUMws/

Instructions:
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RFC6749 (draft-ietf-oauth-v2-31)
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Title               : The OAuth 2.0 Authorization Framework
Publication Date    : October 2012
Author(s)           : D. Hardt, Ed.
Category            : PROPOSED STANDARD
Source              : Web Authorization Protocol
Stream              : IETF
Verifying Party     : IESG

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