What are the ACME protocol divergences for Google's Public CA?
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Google's Public CA generally follows the
RFC 8555 specification for the
ACME protocol. However, there are some minor divergences:
- Section 6.6: Public CA does not provide
Link headers to further
documentation on rate-limiting.
- Section 7.1.2: Public CA does not supply the
orders field on account
objects.
- Section 7.4.2: Public CA does not process
Accept headers for
Content-Type negotiation when retrieving certificates.
- Section 8.2: Retrying challenges is not supported.
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Last updated 2026-04-23 UTC.
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