enableH2c
If set to true and enableHttp2 is set to true, enables HTTP/2 protocol without TLS (h2c) for unencrypted connectors. SSL connectors are unaffected and continue to negotiate HTTP/2 via ALPN when enableHttp2 is true, so this flag can be combined with an SSL connector to serve both HTTP/2 over TLS and h2c from the same server.