[1] draft-gutmann-scep-00 - Simple Certificate Enrolment Protocol ( 版) <https://tools.ietf.org/html/draft-gutmann-scep-00#section-5.2.1.1.2>
The response will have a Content-Type of "application/x-x509-ca-ra-cert".
The body of this response consists of a degenerate certificates-only CMS [3] Signed-Data (Section 3.3) message containing both CA and RA certificates