mod_md v2.4.27
- Fix certificate retrieval on ACME renewal to not require a 'Location:' header returned by the ACME CA. This was the way it was done in ACME before it became an IETF standard. Let's Encrypt still supports this, but other CAs do not. Refs #265.
- Restore compatibility with OpenSSL < 1.1. [ylavic]