public static String getHeader() {
        final StringBuilder builder = new StringBuilder();
        builder.append(Gremlin.version() + "\r\n");
        builder.append("         \\,,,/\r\n");
        builder.append("         (o o)\r\n");
        builder.append("-----oOOo-(" + Gremlin.majorVersion() + ")-oOOo-----\r\n");
        return builder.toString();
    }
Stop Gremlin Server and free the port binding. Note that multiple calls to this method will return the
same instance of the {@code CompletableFuture}.
gremlin-server/src/main/java/org/apache/tinkerpop/gremlin/server/GremlinServer.java