+ * string $tls13_ciphers
+ TLSv1.3 cipher list. Available if libcurl is v7.61.0 or more recent.
+* array $proxy_ssl
+ Subarray of SSL related options to use for the proxy:
+ > See the respective $ssl options above for descriptions.
+ * string $cert
+ Available if libcurl is v7.52.0 or more recent.
+ * string $certtype
+ Available if libcurl is v7.52.0 or more recent.
+ * string $key
+ Available if libcurl is v7.52.0 or more recent.
+ * string $keytype
+ Available if libcurl is v7.52.0 or more recent.
+ * string $keypasswd
+ Available if libcurl is v7.52.0 or more recent.
+ * int $version
+ Available if libcurl is v7.52.0 or more recent.
+ * bool $verifypeer
+ Available if libcurl is v7.52.0 or more recent.
+ * bool $verifyhost
+ Available if libcurl is v7.52.0 or more recent.
+ * string $cipher_list
+ Available if libcurl is v7.52.0 or more recent.
+ * string $cainfo
+ Available if libcurl is v7.52.0 or more recent.
+ * string $capath
+ Available if libcurl is v7.52.0 or more recent.
+ * string $crlfile
+ Available if libcurl is v7.52.0 or more recent.
+ * string $pinned_publickey
+ Available if libcurl is v7.52.0 or more recent.
+ * int $tlsauthtype
+ Available if libcurl is v7.52.0 or more recent.
+ * string $tlsauthuser
+ Available if libcurl is v7.52.0 or more recent.
+ * string $tlsauthpass
+ Available if libcurl is v7.52.0 or more recent.
+ * string $pinned_publickey
+ Available if libcurl is v7.59.0 or more recent.
+ * string $tls13_ciphers
+ Available if libcurl is v7.61.0 or more recent.
+ * string $issuercert
+ Available if libcurl is v7.71.0 or more recent.