@Override
    public String[] mimeTypesSupported() {
        return new String[]{MIME_TYPE, SerTokens.MIME_JSON};
    }
Create a GraphSONMessageSerializer with a provided {@link GraphSONMapper.Builder}.

Note that to make this mapper usable in the context of request messages and responses,
this method will automatically register a {@link GremlinServerModuleV4} to the provided
mapper.
gremlin-util/src/main/java/org/apache/tinkerpop/gremlin/util/ser/GraphSONUntypedMessageSerializerV4.java