docs: def create_request_url(self, interface, method, version, parameters):
          """Create the URL to submit to the Steam Web API
  
          interface: Steam Web API interface containing methods.
          method: The method to call.
          version: The version of the method.
          paramters: Parameters to supply to the method.
  
          """
          if 'format' in parameters:
              parameters['key'] = self.apikey
          else:
              parameters.update({'key' : self.apikey, 'format' : self.format})
          version = "v%04d" % (version)
          url = "http://api.steampowered.com/%s/%s/%s/?%s" % (interface, method,
              version, urlencode(parameters))
          return url