Hello Sorry to insist on my PR review, but it seems it can help some people: https://github.com/apache/incubator-airflow/pull/2723#issuecomment-350356492
For recall, this allows to easily set up airflow as url such as https://lab.mycompany.com/myorg/airflow/ and flower in https://lab.mycompany.com/myorg/airflow/flower API will be accessible at https://lab.mycompany.com/myorg/airflow/api/experimental/... Thanks Gaetan Semet
