Hello,
I just wanted to point out that RFC 5234 defines a core set of production rules 
in Appendix B (https://tools.ietf.org/html/rfc5234#appendix-B) that define 
commonly used rules such as “DIGIT”, “ALPHA”, etc. Using them would make the 
base64url rule clearer:

base64url = ALPHA / DIGIT / “-“ / “_”

Thanks,
Corey

From: Acme <[email protected]> on behalf of Richard Barnes <[email protected]>
Date: Thursday, August 30, 2018 at 8:21 AM
To: "Manger, James H" <[email protected]>
Cc: IETF ACME <[email protected]>
Subject: Re: [Acme] Alexey Melnikov's No Objection on draft-ietf-acme-acme-14: 
(with COMMENT)

Thanks, James.  Fixed in the PR.

On Wed, Aug 29, 2018 at 10:41 PM Manger, James 
<[email protected]<mailto:[email protected]>> wrote:
>>     base64url = [A-Z] / [a-z] / [0-9] / "-" / "_"

> base64url = (%x40-5A) / (%x61-7A) / (%x30-39) / "-" / "_"

“A” is %x41 (not %x40)

--
James Manger
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