pdns: Document that SVCB and HTTPS RRs are supported

These two record types (not yet standardized) have been supported
since the 4.4.0 release, but were not listed in the 'Supported
Record Types' appendix in the documentation.

diff --git a/docs/appendices/types.rst b/docs/appendices/types.rst
index 1721b635461ccc09bd51a9067fcbda5e3e4b8b0c..8b55c3438c8f020393540751d6f0f3d1be6a9d35 100644 (file)
--- a/docs/appendices/types.rst
+++ b/docs/appendices/types.rst
@@ -300,6 +300,20 @@ priority. For example,
 be encoded with ``0`` in the priority field and
 ``100 389 mars.conaxis.ch`` in the content field.
 
+SVCB, HTTPS
+-----------
+
+Since 4.4. SVCB records, defined in
+(`draft-ietf-dnsop-svcb-https-07.html
+<https://www.ietf.org/archive/id/draft-ietf-dnsop-svcb-https-07.html>`__)
+are used to facilitate the lookup of information needed to make
+connections to network services. SVCB records allow a service to be
+provided from multiple alternative endpoints, each with associated
+parameters (such as transport protocol configuration and keys for
+encrypting the TLS ClientHello). They also enable aliasing of apex
+domains, which is not possible with CNAME. The HTTPS RR is a variation
+of SVCB for HTTPS and HTTP origins.
+
 TKEY, TSIG
 ----------