Armand,
Please realize that what you are asking, URL logging and storing, is explicitly forbidden by European privacy rules; and by privacy regulations in many other parts of the world. I understand that there is a conflict between local French regulations and the European regulations, but as explained ClearPass is not in the traffic flow, and Airwave is logging all traffic, just not with URL detail to make the data useful for analysis. This results in customers requiring non-standard URL detailed request logging to put in additional in-line solutions. In most countries, the data-retention legislation is only applicable to service providers, not to individiual businesses providing guest access.
In my recent visits to France, the actual implementation seems to have relaxed significantly; at multiple places I could just access the guest network without any identification; so things may have changed recently.
I'd like to ask you to contact the French Aruba team for advise, as they know local French regulations and how to handle that with Aruba equipment. Please send me a PM (personal message) through Airheads if you do not have a contact in the French Aruba.