private AbstractAuthenticationHandler instantiateAuthenticationHandler(final Settings settings) {
        final String authHandlerClass = settings.authentication.authenticationHandler;
        if (authHandlerClass == null) {
            //Keep things backwards compatible
            return new HttpBasicAuthenticationHandler(authenticator, authorizer, settings);
        } else {
            return createAuthenticationHandler(settings);
        }
    }
Constructs a {@link Channelizer} that exposes an HTTP endpoint in Gremlin Server.

@author Stephen Mallette (http://stephen.genoprime.com)
gremlin-server/src/main/java/org/apache/tinkerpop/gremlin/server/channel/HttpChannelizer.java