https://github.com/ietf-wg-acme/acme/pull/168
-In all HTTPS transactions used by ACME, the ACME client is the HTTPS
client and
-the ACME server is the HTTPS server.
+In most HTTPS transactions used by ACME, the ACME client is the HTTPS
client
+and the ACME server is the HTTPS server. The ACME server acts as an
HTTP and
+HTTPS client when validating challenges via HTTP.
+
+ACME clients SHOULD send a User-Agent header in accordance with
+{{!RFC7231}}, including the name and version of the ACME software in
+addition to the name and version of the underlying HTTP client software.
+
+ACME clients SHOULD send an Accept-Language header in accordance with
+{{!RFC7231}} to enable localization of error messages.
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