Handle properly the '/https/*' urls
CW uses a url prefix to detect https behing a reverse-proxy.
A more proper way to do that is documented here in the waitress documentation
(waitress is the default pyramid wsgi server):
https://waitress.readthedocs.org/en/latest/#using-behind-a-reverse-proxy
A later version should implement this, or use waitress in the 'pyramid'
command.
Related to #4291181