QNetworkAccessManager and redirections

[wysota]

That's because the app dies there.

The content gets downloaded, it's even in the log you posted. Just check what's inside.

[alexandernst]

You're right. after the last "HEADER: xxxxxxxx", I get a file to the path that I specified in my code, but the content of the file is a HTML page. What does that mean?

[wysota]

It means you should show us the contents of the page.

[alexandernst]

Here you go: http://pastebin.com/qhh6sfvt

[wysota]

What about the cookies? Did you return them with the request properly?

[alexandernst]

I had a look at wireshark but I can't see the second GET
Can you see something wrong? http://pastebin.com/8VzT0JLc

[wysota]

Please don't use pastebin. Attach files to your post instead.

Please, do me a favour - dump headers of your second request to the console and show them to me.

[alexandernst]

Please don't use pastebin. Attach files to your post instead.

Ok, I'll do that from now on

Please, do me a favour - dump headers of your second request to the console and show them to me.

The log that I posted from my app in one of my posts is the entire output, and the entire output that QNetworkReply/QNAM can get me. Look at the part of my code where I output information.

def downloadFinished(self, reply):
    redirect = reply.attribute(QNetworkRequest.RedirectionTargetAttribute).toUrl()
    print "ERROR CODE: " + str(reply.attribute(QNetworkRequest.HttpStatusCodeAttribute).toInt())
    for item in reply.rawHeaderList():
      print "HEADER: " + str(item) + " === " + reply.rawHeader(str(item))
    if not redirect.isEmpty():
      print "REDIRECT: " + str(redirect)
      self.reply = self.manager.get(QNetworkRequest(redirect))
      self.reply.downloadProgress.connect(self.updateDataReadProgress)
    else:
      self.updateFile = QFile(self.downloadPath)
      self.updateFile.open(QIODevice.WriteOnly)
      self.updateFile.write(self.reply.readAll())
      self.updateFile.close()
      self.reply.deleteLater()
      self.manager.deleteLater()
    reply.deleteLater()

def downloadFinished(self, reply):
    redirect = reply.attribute(QNetworkRequest.RedirectionTargetAttribute).toUrl()
    print "ERROR CODE: " + str(reply.attribute(QNetworkRequest.HttpStatusCodeAttribute).toInt())
    for item in reply.rawHeaderList():
      print "HEADER: " + str(item) + " === " + reply.rawHeader(str(item))
    if not redirect.isEmpty():
      print "REDIRECT: " + str(redirect)
      self.reply = self.manager.get(QNetworkRequest(redirect))
      self.reply.downloadProgress.connect(self.updateDataReadProgress)
    else:
      self.updateFile = QFile(self.downloadPath)
      self.updateFile.open(QIODevice.WriteOnly)
      self.updateFile.write(self.reply.readAll())
      self.updateFile.close()
      self.reply.deleteLater()
      self.manager.deleteLater()
    reply.deleteLater()

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As you can see, the second redirect's header list is printed item by item, and it gets only 1 item (the Content-Lenght one). Then evaluates the redirect.isEmpty(), and goes to the "else". And then saves the reply.readAll() to the file that I posted in #24.

[wysota]

The log that I posted from my app in one of my posts is the entire output, and the entire output that QNetworkReply/QNAM can get me.

I'm asking for the request, not for the reply.

[alexandernst]

I'm trying to get the request header but I'm not able to get it. I don't get anything with request.rawHeaderList().
My actual code looks like this:

def downloadFinished(self, reply):
    redirect = reply.attribute(QNetworkRequest.RedirectionTargetAttribute).toUrl()
    print "ERROR CODE: " + str(reply.attribute(QNetworkRequest.HttpStatusCodeAttribute).toInt())
    for item in reply.rawHeaderList():
      print "REPLY HEADER: " + str(item) + " === " + reply.rawHeader(str(item))
    request = QNetworkRequest(redirect)
    for item in request.rawHeaderList():
      print "REQUEST HEADER: " + str(item) + " === " + request.rawHeader(str(item))
    if not redirect.isEmpty():
      print "REDIRECT: " + str(redirect)
      self.reply = self.manager.get(request)
      self.reply.downloadProgress.connect(self.updateDataReadProgress)
    else:
      self.updateFile = QFile(self.downloadPath)
      self.updateFile.open(QIODevice.WriteOnly)
      self.updateFile.write(self.reply.readAll())
      self.updateFile.close()
      self.reply.deleteLater()
      self.manager.deleteLater()
    reply.deleteLater()

def downloadFinished(self, reply):
    redirect = reply.attribute(QNetworkRequest.RedirectionTargetAttribute).toUrl()
    print "ERROR CODE: " + str(reply.attribute(QNetworkRequest.HttpStatusCodeAttribute).toInt())
    for item in reply.rawHeaderList():
      print "REPLY HEADER: " + str(item) + " === " + reply.rawHeader(str(item))
    request = QNetworkRequest(redirect)
    for item in request.rawHeaderList():
      print "REQUEST HEADER: " + str(item) + " === " + request.rawHeader(str(item))
    if not redirect.isEmpty():
      print "REDIRECT: " + str(redirect)
      self.reply = self.manager.get(request)
      self.reply.downloadProgress.connect(self.updateDataReadProgress)
    else:
      self.updateFile = QFile(self.downloadPath)
      self.updateFile.open(QIODevice.WriteOnly)
      self.updateFile.write(self.reply.readAll())
      self.updateFile.close()
      self.reply.deleteLater()
      self.manager.deleteLater()
    reply.deleteLater()

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PS: Is it really that hard to make Qt act like urllib in python or wget/curl? Isn't really there something in Qt that will just work?

[wysota]

PS: Is it really that hard to make Qt act like urllib in python or wget/curl?

It is as hard as making wget/curl/urllib act like Qt.

Isn't really there something in Qt that will just work?

It does work.

Edit: Try 'reply.request()' instead of 'request' (whatever that is).

Don't blame Qt for your own mistakes.

[alexandernst]

Yep, that worked. Now I get the request header.

Output:

UPDATE: 163 of 163
ERROR CODE: (302, True)
REPLY HEADER: Server === nginx/0.7.63
REPLY HEADER: Date === Wed, 22 Sep 2010 12:44:44 GMT
REPLY HEADER: Content-Type === text/html; charset=UTF-8
REPLY HEADER: Connection === close
REPLY HEADER: Set-cookie === sf.consume=0fc84a4cf5c340bc4b568a7694abce97a8a762edgAJ9cQEoVQhfZXhwaXJlc3ECY2RhdGV0aW1lCmRhdGV0aW1lCnEDVQoH9gETAw4HAAAAhVJxBFUDX2lkcQVVIGMwNzM1ZWU5YzVlZjFlYjk4OTU5MWI0ZTg3YjZlZDRhcQZVDl9hY2Nlc3NlZF90aW1lcQdHQdMmfo8Q+CtVDl9jcmVhdGlvbl90aW1lcQhHQdMmfo8Q+Cd1Lg==; expires=Tue, 19-Jan-2038 03:14:07 GMT; Path=/
REPLY HEADER: Location === http://sourceforge.net/projects/python-jake/files/betas/Jake-PyQT4-0.1.zip/download
REPLY HEADER: Content-Length === 163
REDIRECT: PyQt4.QtCore.QUrl(u'http://sourceforge.net/projects/python-jake/files/betas/Jake-PyQT4-0.1.zip/download')
UPDATE: 697 of 17529
UPDATE: 2145 of 17529
UPDATE: 3593 of 17529
UPDATE: 6489 of 17529
UPDATE: 7937 of 17529
UPDATE: 9385 of 17529
UPDATE: 10833 of 17529
UPDATE: 12281 of 17529
UPDATE: 13729 of 17529
UPDATE: 15177 of 17529
UPDATE: 16625 of 17529
UPDATE: 17529 of 17529
ERROR CODE: (200, True)
REPLY HEADER: Server === nginx/0.7.63
REPLY HEADER: Date === Wed, 22 Sep 2010 12:44:47 GMT
REPLY HEADER: Content-Type === text/html; charset=utf-8
REPLY HEADER: Connection === close
REPLY HEADER: Pragma === no-cache
REPLY HEADER: Cache-Control === no-cache
REPLY HEADER: Set-cookie === VISITOR=4c99fa3c86502b0357001464; expires="Sat, 19-Sep-2020 12:44:47 GMT"; httponly; Max-Age=315360000; Path=/
sf.consume=be407794209dedb983a3e46c45e09112972ef415gAJ9cQEoVQhfZXhwaXJlc3ECY2RhdGV0aW1lCmRhdGV0aW1lCnEDVQoH9gETAw4HAAAAhVJxBFUFcHJlZnNxBX1xBlUOdXNlc19yZWxhdGlvbnNxB4lVB3ZlcnNpb25xCFUBMlUDa2V5cQlVGDRjOTlmYTNjODY1MDJiMDM1NzAwMTQ2NHEKVQNfaWRxC1UgZmRmOGIxMWEyZDQ2ZDkzMjljMTU1NjY5MTc0ZTJiMDdxDFUOX2FjY2Vzc2VkX3RpbWVxDUdB0yZ+j9wyalUOX2NyZWF0aW9uX3RpbWVxDkdB0yZ+j9wxanUu; expires=Tue, 19-Jan-2038 03:14:07 GMT; Path=/
REPLY HEADER: Content-Length === 17529
REQUEST HEADER: Cookie === sf.consume=0fc84a4cf5c340bc4b568a7694abce97a8a762edgAJ9cQEoVQhfZXhwaXJlc3ECY2RhdGV0aW1lCmRhdGV0aW1lCnEDVQoH9gETAw4HAAAAhVJxBFUDX2lkcQVVIGMwNzM1ZWU5YzVlZjFlYjk4OTU5MWI0ZTg3YjZlZDRhcQZVDl9hY2Nlc3NlZF90aW1lcQdHQdMmfo8Q+CtVDl9jcmVhdGlvbl90aW1lcQhHQdMmfo8Q+Cd1Lg==
ERROR CODE: (200, True)
REPLY HEADER: Server === nginx/0.7.63
REPLY HEADER: Date === Wed, 22 Sep 2010 12:44:47 GMT
REPLY HEADER: Content-Type === text/html; charset=utf-8
REPLY HEADER: Connection === close
REPLY HEADER: Pragma === no-cache
REPLY HEADER: Cache-Control === no-cache
REPLY HEADER: Set-cookie === VISITOR=4c99fa3c86502b0357001464; expires="Sat, 19-Sep-2020 12:44:47 GMT"; httponly; Max-Age=315360000; Path=/
sf.consume=be407794209dedb983a3e46c45e09112972ef415gAJ9cQEoVQhfZXhwaXJlc3ECY2RhdGV0aW1lCmRhdGV0aW1lCnEDVQoH9gETAw4HAAAAhVJxBFUFcHJlZnNxBX1xBlUOdXNlc19yZWxhdGlvbnNxB4lVB3ZlcnNpb25xCFUBMlUDa2V5cQlVGDRjOTlmYTNjODY1MDJiMDM1NzAwMTQ2NHEKVQNfaWRxC1UgZmRmOGIxMWEyZDQ2ZDkzMjljMTU1NjY5MTc0ZTJiMDdxDFUOX2FjY2Vzc2VkX3RpbWVxDUdB0yZ+j9wyalUOX2NyZWF0aW9uX3RpbWVxDkdB0yZ+j9wxanUu; expires=Tue, 19-Jan-2038 03:14:07 GMT; Path=/
REPLY HEADER: Content-Length === 17529
REQUEST HEADER: Cookie === sf.consume=0fc84a4cf5c340bc4b568a7694abce97a8a762edgAJ9cQEoVQhfZXhwaXJlc3ECY2RhdGV0aW1lCmRhdGV0aW1lCnEDVQoH9gETAw4HAAAAhVJxBFUDX2lkcQVVIGMwNzM1ZWU5YzVlZjFlYjk4OTU5MWI0ZTg3YjZlZDRhcQZVDl9hY2Nlc3NlZF90aW1lcQdHQdMmfo8Q+CtVDl9jcmVhdGlvbl90aW1lcQhHQdMmfo8Q+Cd1Lg==

UPDATE: 163 of 163
ERROR CODE: (302, True)
REPLY HEADER: Server === nginx/0.7.63
REPLY HEADER: Date === Wed, 22 Sep 2010 12:44:44 GMT
REPLY HEADER: Content-Type === text/html; charset=UTF-8
REPLY HEADER: Connection === close
REPLY HEADER: Set-cookie === sf.consume=0fc84a4cf5c340bc4b568a7694abce97a8a762edgAJ9cQEoVQhfZXhwaXJlc3ECY2RhdGV0aW1lCmRhdGV0aW1lCnEDVQoH9gETAw4HAAAAhVJxBFUDX2lkcQVVIGMwNzM1ZWU5YzVlZjFlYjk4OTU5MWI0ZTg3YjZlZDRhcQZVDl9hY2Nlc3NlZF90aW1lcQdHQdMmfo8Q+CtVDl9jcmVhdGlvbl90aW1lcQhHQdMmfo8Q+Cd1Lg==; expires=Tue, 19-Jan-2038 03:14:07 GMT; Path=/
REPLY HEADER: Location === http://sourceforge.net/projects/python-jake/files/betas/Jake-PyQT4-0.1.zip/download
REPLY HEADER: Content-Length === 163
REDIRECT: PyQt4.QtCore.QUrl(u'http://sourceforge.net/projects/python-jake/files/betas/Jake-PyQT4-0.1.zip/download')
UPDATE: 697 of 17529
UPDATE: 2145 of 17529
UPDATE: 3593 of 17529
UPDATE: 6489 of 17529
UPDATE: 7937 of 17529
UPDATE: 9385 of 17529
UPDATE: 10833 of 17529
UPDATE: 12281 of 17529
UPDATE: 13729 of 17529
UPDATE: 15177 of 17529
UPDATE: 16625 of 17529
UPDATE: 17529 of 17529
ERROR CODE: (200, True)
REPLY HEADER: Server === nginx/0.7.63
REPLY HEADER: Date === Wed, 22 Sep 2010 12:44:47 GMT
REPLY HEADER: Content-Type === text/html; charset=utf-8
REPLY HEADER: Connection === close
REPLY HEADER: Pragma === no-cache
REPLY HEADER: Cache-Control === no-cache
REPLY HEADER: Set-cookie === VISITOR=4c99fa3c86502b0357001464; expires="Sat, 19-Sep-2020 12:44:47 GMT"; httponly; Max-Age=315360000; Path=/
sf.consume=be407794209dedb983a3e46c45e09112972ef415gAJ9cQEoVQhfZXhwaXJlc3ECY2RhdGV0aW1lCmRhdGV0aW1lCnEDVQoH9gETAw4HAAAAhVJxBFUFcHJlZnNxBX1xBlUOdXNlc19yZWxhdGlvbnNxB4lVB3ZlcnNpb25xCFUBMlUDa2V5cQlVGDRjOTlmYTNjODY1MDJiMDM1NzAwMTQ2NHEKVQNfaWRxC1UgZmRmOGIxMWEyZDQ2ZDkzMjljMTU1NjY5MTc0ZTJiMDdxDFUOX2FjY2Vzc2VkX3RpbWVxDUdB0yZ+j9wyalUOX2NyZWF0aW9uX3RpbWVxDkdB0yZ+j9wxanUu; expires=Tue, 19-Jan-2038 03:14:07 GMT; Path=/
REPLY HEADER: Content-Length === 17529
REQUEST HEADER: Cookie === sf.consume=0fc84a4cf5c340bc4b568a7694abce97a8a762edgAJ9cQEoVQhfZXhwaXJlc3ECY2RhdGV0aW1lCmRhdGV0aW1lCnEDVQoH9gETAw4HAAAAhVJxBFUDX2lkcQVVIGMwNzM1ZWU5YzVlZjFlYjk4OTU5MWI0ZTg3YjZlZDRhcQZVDl9hY2Nlc3NlZF90aW1lcQdHQdMmfo8Q+CtVDl9jcmVhdGlvbl90aW1lcQhHQdMmfo8Q+Cd1Lg==
ERROR CODE: (200, True)
REPLY HEADER: Server === nginx/0.7.63
REPLY HEADER: Date === Wed, 22 Sep 2010 12:44:47 GMT
REPLY HEADER: Content-Type === text/html; charset=utf-8
REPLY HEADER: Connection === close
REPLY HEADER: Pragma === no-cache
REPLY HEADER: Cache-Control === no-cache
REPLY HEADER: Set-cookie === VISITOR=4c99fa3c86502b0357001464; expires="Sat, 19-Sep-2020 12:44:47 GMT"; httponly; Max-Age=315360000; Path=/
sf.consume=be407794209dedb983a3e46c45e09112972ef415gAJ9cQEoVQhfZXhwaXJlc3ECY2RhdGV0aW1lCmRhdGV0aW1lCnEDVQoH9gETAw4HAAAAhVJxBFUFcHJlZnNxBX1xBlUOdXNlc19yZWxhdGlvbnNxB4lVB3ZlcnNpb25xCFUBMlUDa2V5cQlVGDRjOTlmYTNjODY1MDJiMDM1NzAwMTQ2NHEKVQNfaWRxC1UgZmRmOGIxMWEyZDQ2ZDkzMjljMTU1NjY5MTc0ZTJiMDdxDFUOX2FjY2Vzc2VkX3RpbWVxDUdB0yZ+j9wyalUOX2NyZWF0aW9uX3RpbWVxDkdB0yZ+j9wxanUu; expires=Tue, 19-Jan-2038 03:14:07 GMT; Path=/
REPLY HEADER: Content-Length === 17529
REQUEST HEADER: Cookie === sf.consume=0fc84a4cf5c340bc4b568a7694abce97a8a762edgAJ9cQEoVQhfZXhwaXJlc3ECY2RhdGV0aW1lCmRhdGV0aW1lCnEDVQoH9gETAw4HAAAAhVJxBFUDX2lkcQVVIGMwNzM1ZWU5YzVlZjFlYjk4OTU5MWI0ZTg3YjZlZDRhcQZVDl9hY2Nlc3NlZF90aW1lcQdHQdMmfo8Q+CtVDl9jcmVhdGlvbl90aW1lcQhHQdMmfo8Q+Cd1Lg==

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Code:

def downloadFinished(self, reply):
    redirect = reply.attribute(QNetworkRequest.RedirectionTargetAttribute).toUrl()
    print "ERROR CODE: " + str(reply.attribute(QNetworkRequest.HttpStatusCodeAttribute).toInt())
    for item in reply.rawHeaderList():
      print "REPLY HEADER: " + str(item) + " === " + reply.rawHeader(str(item))
    for item in reply.request().rawHeaderList():
      print "REQUEST HEADER: " + str(item) + " === " + reply.request().rawHeader(str(item))
    if not redirect.isEmpty():
      print "REDIRECT: " + str(redirect)
      request = QNetworkRequest(redirect)
      self.reply = self.manager.get(request)
      self.reply.downloadProgress.connect(self.updateDataReadProgress)
    else:
      self.updateFile = QFile(self.downloadPath)
      self.updateFile.open(QIODevice.WriteOnly)
      self.updateFile.write(self.reply.readAll())
      self.updateFile.close()
      self.reply.deleteLater()
      self.manager.deleteLater()
    reply.deleteLater()

def downloadFinished(self, reply):
    redirect = reply.attribute(QNetworkRequest.RedirectionTargetAttribute).toUrl()
    print "ERROR CODE: " + str(reply.attribute(QNetworkRequest.HttpStatusCodeAttribute).toInt())
    for item in reply.rawHeaderList():
      print "REPLY HEADER: " + str(item) + " === " + reply.rawHeader(str(item))
    for item in reply.request().rawHeaderList():
      print "REQUEST HEADER: " + str(item) + " === " + reply.request().rawHeader(str(item))
    if not redirect.isEmpty():
      print "REDIRECT: " + str(redirect)
      request = QNetworkRequest(redirect)
      self.reply = self.manager.get(request)
      self.reply.downloadProgress.connect(self.updateDataReadProgress)
    else:
      self.updateFile = QFile(self.downloadPath)
      self.updateFile.open(QIODevice.WriteOnly)
      self.updateFile.write(self.reply.readAll())
      self.updateFile.close()
      self.reply.deleteLater()
      self.manager.deleteLater()
    reply.deleteLater()

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So, I do send the cookie, but the app just stays there. No progress, no further replies, no nothing.

[wysota]

Ok but what further reply would you expect? The webpage you are getting is setup in a way that after a couple of seconds a (probably javascript based) event kicks in and redirects you elsewhere.

You are probably not sending some header sf.net requires to redirect you automatically without the waiting period. It could be a user-agent, for instance. Compare the traffic between wget and sf.net with that between your application and sf.net. Try sending the same headers and see what reply you get.

[alexandernst]

Finally!!!
It's working!!!!!!
I set (as you suggested) the user-agent to wget's user-agent and now it's working just fine

Here is the complete code:

# -*- coding: utf-8 -*-
import sys, os
from PyQt4 import QtCore, QtGui
from PyQt4.QtCore import *
from PyQt4.QtGui import *
from PyQt4.QtNetwork import *
class QDownloader(QProgressDialog):
  def __init__(self, parent=None):
    QProgressDialog.__init__(self, parent)
    self.parent = parent
    self.url = "https://sourceforge.net/projects/python-jake/files/betas/Jake-PyQT4-0.1.zip/download"
    self.downloadPath = "/tmp/tmpreadfile"
    self.manager = QNetworkAccessManager()
    self.jar = QNetworkCookieJar()
    self.manager.setCookieJar(self.jar)
    self.resize(self.size().width()*2, self.size().height())
    self.manager.finished.connect(self.downloadFinished)
    self.canceled.connect(self.cancelDownload)
    self.show()
    self.download()
 
  def download(self):
    self.url = QUrl(self.url)
    self.request = QNetworkRequest(self.url)
    self.request.setRawHeader("User-Agent", "Wget/1.12 (linux-gnu)")
    self.reply = self.manager.get(self.request)
    self.reply.downloadProgress.connect(self.updateDataReadProgress)
 
  def updateDataReadProgress(self, done, total):
    self.setMaximum(total)
    self.setValue(done)
 
  def downloadFinished(self, reply):
    self.redirect = reply.attribute(QNetworkRequest.RedirectionTargetAttribute).toUrl()
    if not self.redirect.isEmpty():
      self.request = QNetworkRequest(self.redirect)
      self.request.setRawHeader("User-Agent", "Wget/1.12 (linux-gnu)")
      self.reply = self.manager.get(self.request)
      self.reply.downloadProgress.connect(self.updateDataReadProgress)
    else:
      self.updateFile = QFile(self.downloadPath)
      self.updateFile.open(QIODevice.WriteOnly)
      self.updateFile.write(self.reply.readAll())
      self.updateFile.close()
      self.reply.deleteLater()
      self.manager.deleteLater()
      self.close()
    reply.deleteLater()
 
  def cancelDownload(self):
    self.reply.abort()
 
app = QtGui.QApplication(sys.argv)
window = QDownloader()
sys.exit(app.exec_())

# -*- coding: utf-8 -*-
import sys, os
from PyQt4 import QtCore, QtGui
from PyQt4.QtCore import *
from PyQt4.QtGui import *
from PyQt4.QtNetwork import *
class QDownloader(QProgressDialog):
  def __init__(self, parent=None):
    QProgressDialog.__init__(self, parent)
    self.parent = parent
    self.url = "https://sourceforge.net/projects/python-jake/files/betas/Jake-PyQT4-0.1.zip/download"
    self.downloadPath = "/tmp/tmpreadfile"
    self.manager = QNetworkAccessManager()
    self.jar = QNetworkCookieJar()
    self.manager.setCookieJar(self.jar)
    self.resize(self.size().width()*2, self.size().height())
    self.manager.finished.connect(self.downloadFinished)
    self.canceled.connect(self.cancelDownload)
    self.show()
    self.download()

  def download(self):
    self.url = QUrl(self.url)
    self.request = QNetworkRequest(self.url)
    self.request.setRawHeader("User-Agent", "Wget/1.12 (linux-gnu)")
    self.reply = self.manager.get(self.request)
    self.reply.downloadProgress.connect(self.updateDataReadProgress)

  def updateDataReadProgress(self, done, total):
    self.setMaximum(total)
    self.setValue(done)

  def downloadFinished(self, reply):
    self.redirect = reply.attribute(QNetworkRequest.RedirectionTargetAttribute).toUrl()
    if not self.redirect.isEmpty():
      self.request = QNetworkRequest(self.redirect)
      self.request.setRawHeader("User-Agent", "Wget/1.12 (linux-gnu)")
      self.reply = self.manager.get(self.request)
      self.reply.downloadProgress.connect(self.updateDataReadProgress)
    else:
      self.updateFile = QFile(self.downloadPath)
      self.updateFile.open(QIODevice.WriteOnly)
      self.updateFile.write(self.reply.readAll())
      self.updateFile.close()
      self.reply.deleteLater()
      self.manager.deleteLater()
      self.close()
    reply.deleteLater()

  def cancelDownload(self):
    self.reply.abort()

app = QtGui.QApplication(sys.argv)
window = QDownloader()
sys.exit(app.exec_())

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