setAlpnProtocols method Null safety
Sets the list of application-level protocols supported by a client connection or server connection. The ALPN (application level protocol negotiation) extension to TLS allows a client to send a list of protocols in the TLS client hello message, and the server to pick one and send the selected one back in its server hello message.
Separate lists of protocols can be sent for client connections and
for server connections, using the same SecurityContext. The
boolean argument specifies whether to set the list for server connections
or client connections.
void setAlpnProtocols(List<String> protocols, bool isServer);