Reading spreadsheets using Google Spreadsheets API

I’m trying to read a spreadsheet feed using the Google Spreadsheet API. For that, I’m using a HTTP Service with an URL Loader.

I actually don’t have any problems for making it work in my flex environnement, but once I publish it : I have the security sandbox problem.

After searching in the Internet, it seems related to the crossdomain.xml file, so I added :


to my AS file. But it still don’t work.

I also stumbled upon this :
And I was confused as I can see a crossdomain.xml file over, but it just don’t work.

I would appreciate any help, some people told me to use JSON in place.