index redefinition

class FileNameReports(Reports):
 
#    _cp_path = 'web/report'
 
    def get_filename_report(self, action, report_struct):
        filename = '%s %s.%s' %(action['name'], time.strftime('%Y-%m-%d %H%M%S'), report_struct['format'])
        return filename
 
    @openerpweb.httprequest
    def index(self, req, action, token):
        res = super(FileNameReports, self).index(req, action, token)
        #here i can hack response
        return res
 
 
#####################
 
2013-06-17 05:53:02,471 1145 ERROR ? openerp.addons.web.common.http.HttpRequest.dispatch: An error occurred while handling a json request
Traceback (most recent call last):
  File "/home/ovnicraft/dev/openerp/61/web/addons/web/common/http.py", line 260, in dispatch
    r = method(controller, self, **self.params)
  File "/home/ovnicraft/dev/openerp/61/web-addons-report-name/web_report_name/controllers.py", line 19, in index
    res = super(FileNameReports, self).index(req, action, token)
TypeError: http_handler() takes exactly 3 arguments (4 given)