CURLE_SSL_PINNEDPUBKEYNOTMATCH and CURLE_SSL_INVALIDCERTSTATUS
.IP "CURLE_NO_CONNECTION_AVAILABLE (89)"
(For internal use only, will never be returned by libcurl) No connection
available, the session will be queued. (added in 7.30.0)
+.IP "CURLE_SSL_PINNEDPUBKEYNOTMATCH (90)"
+Failed to match the pinned key specified with \fICURLOPT_PINNEDPUBLICKEY(3)\fP.
+.IP "CURLE_SSL_INVALIDCERTSTATUS (91)"
+Status returned failure when asked with \fICURLOPT_SSL_VERIFYSTATUS(3)\fP.
.IP "CURLE_OBSOLETE*"
These error codes will never be returned. They were used in an old libcurl
version and are currently unused.