def assertNoHeader(self, key, msg=None):
        lowkey = key.lower()
        matches = [k for k, v in self.headers if k.lower() == lowkey]
        if matches:
            if msg is None:
                msg = '%r in headers' % key
            self._handlewebError(msg)
Calculate the plant signal based on variables (desired vs measured) for given update time (dt).
dataset/ETHPy150Open AppScale/appscale/AppServer/lib/cherrypy/cherrypy/test/webtest.py/WebCase.assertNoHeader--crossover with--dataset/ETHPy150Open FishPi/FishPi-POCV---Command---Control/fishpi/control/navigation.py/BasicPIDControl.update