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RFC 8555, "Automatic Certificate Management Environment (ACME)", March 2019

Source of RFC: acme (sec)

Errata ID: 5729
Status: Reported
Type: Technical
Publication Format(s) : TEXT

Reported By: Rob Stradling
Date Reported: 2019-05-22

Section 7.5.1 says:

The client indicates to the server that it is ready for the challenge
validation by sending an empty JSON body ("{}") carried in a POST
request to the challenge URL (not the authorization URL).

It should say:

The client indicates to the server that it is ready for the challenge
validation by sending a POST request to the challenge URL (not the
authorization URL), where the body of the POST request is a JWS object
whose JSON payload is a response object (see Section 8).  For all
challenge types defined in this document, the response object is the
empty JSON object ("{}").

Notes:

It's clear from other text in section 7.5.1 that the "empty JSON body" is interpreted by the ACME server as a "response object". (The first function of this erratum is to clarify this point).

Section 8 says that "The definition of a challenge type includes...Contents of response objects", and section 7.5.1 notes that "the challenges in this document do not define any response fields, but future specifications might define them". (The second function of this erratum is to permit clients to send response objects that contain response fields).

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