9a77fb6306
https://tools.ietf.org/html/rfc8555#section-6.3 https://community.letsencrypt.org/t/post-as-get-and-empty-payload-instead-of/86720/3 https://community.letsencrypt.org/t/problem-with-renew-certificates-the-request-message-was-malformed-method-not-allowed/107889/17