from PyQt4 import QtCore, QtNetwork
import sys

class App(QtCore.QCoreApplication):

    def __init__(self, argv):
        QtCore.QCoreApplication.__init__(self, argv)

        self.nam = QtNetwork.QNetworkAccessManager()
    def exec_(self):
        self.rep = self.nam.get(QtNetwork.QNetworkRequest(QtCore.QUrl('localhost:8888')))
        self.rep.finished.connect(self.foo)
        self.startTimer(2000)
        QtCore.QCoreApplication.exec_()

    def foo(self):
        pass

    def timerEvent(self, id):
        self.rep.finished.disconnect()
        self.rep.abort()


app = App(sys.argv)
app.exec_()