The Manager now uses RFC 8555 implementation of Let's Encrypt by default.
Existing users need not do any manual upgrades. If you vendor
acme/autocert, it is enough to just rebuild your binaries at this CL.
If there's an account key stored in Manager's cache which has been used
with an earlier Let's Encrypt implementation (aka v1 or draft-02),
it will be automatically re-registered with the new endpoint.
One notable change is the CAServer from internal/acmetest was amended
to simulate a CA implementing RFC 8555, replacing draft-02.
Support for both RFC and draft-02 seemed too complicated and not worth
the benefits: the old pre-RFC bits will be removed from both acme and
acme/autocert packages at some point.
Fixesgolang/go#21081
Change-Id: Id530758ac612b1c20f9df51c4d10f770e5f41ecf
Reviewed-on: https://go-review.googlesource.com/c/crypto/+/199520
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Alex Vaghin
0e8c3a9068