code: def GET(self):
          
          if self._GET is None:
              data = parse_qs(self.query_string, keep_blank_values=True)
              self._GET = MultiDict()
              for key, values in data.iteritems():
                  for value in values:
                      self._GET[key] = value
          return self._GET
docs: The QUERY_STRING parsed into a MultiDict.
  
              Keys and values are strings. Multiple values per key are possible.
              See MultiDict for details.