*Created by: cpu* Hi there! Thanks for writing an ACME client. I wanted to mention [Section 5.1 of ACME Draft-04](https://tools.ietf.org/html/draft-ietf-acme-acme-04#section-5.1): > 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. It doesn't look like `acmebot` is setting a UA right now, would you consider adding one? It certainly helps us from the server-side when we are troubleshooting client errors. Thanks!