def requestTunnel(self, protocol):
        tunnelReq = tunnel_request_data(self._tunneledHost, self._tunneledPort,
                                        self._proxyAuthHeader)
        protocol.transport.write(tunnelReq)
        self._protocolDataReceived = protocol.dataReceived
        protocol.dataReceived = self.processProxyResponse
        self._protocol = protocol
        return protocol
task._clean_prior: invalid pid file exists, do nothing.
dataset/ETHPy150Open scrapy/scrapy/scrapy/core/downloader/handlers/http11.py/TunnelingTCP4ClientEndpoint.requestTunnel--crossover with--dataset/ETHPy150Open xtrementl/focus/tests/unit/test_task.py/TestTask.testPidFileExistsInvalid___clean_prior