commit 92783773f0d5c65e68a806909423bea53c78df01
author Alex Vaghin <ddos@google.com> Wed Feb 08 14:36:45 2017 +0100
committer Alex Vaghin <ddos@google.com> Wed Feb 08 23:57:13 2017 +0000
tree 3e88eb1d7aebaa9c9ff4f632dc9b80d3256c6912
parent 537c9dfe43c8ca78e68e340fc140bca4d8bfaaa0

acme: reduce the number of network round trips

Before this change, every JWS-signed request was preceded
by a HEAD request to fetch a fresh nonce.

The Client is now able to collect nonce values
from server responses and use them for future requests.
Additionally, this change also makes sure the client propagates
any error encountered during a fresh nonce fetch.

Fixes golang/go#18428.

Change-Id: I33d21b450351cf4d98e72ee6c8fa654e9554bf92
Reviewed-on: https://go-review.googlesource.com/36514
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>