A literal IP address or host name that can be resolved to an IP address. If not specified, defaults to 127.0.0.1.

A list of root certificates that will be used in addition to the default root certificates to verify the peer's certificate.

Must be in PEM format.

Application-Layer Protocol Negotiation (ALPN) protocols to announce to the client. If not specified, no ALPN extension will be included in the TLS handshake.