def get_request(self, request, page=None, fileobj=None, filename=None):
        """Start a download with a QNetworkRequest.

        Args:
            request: The QNetworkRequest to download.
            page: The QWebPage to use.
            fileobj: The file object to write the answer to.
            filename: A path to write the data to.

        Return:
            If the download could start immediately, (fileobj/filename given),
            the created DownloadItem.

            If not, None.
        """
        if fileobj is not None and filename is not None:
            raise TypeError("Only one of fileobj/filename may be given!")
        # WORKAROUND for Qt corrupting data loaded from cache:
        # https://bugreports.qt-project.org/browse/QTBUG-42757
        request.setAttribute(QNetworkRequest.CacheLoadControlAttribute,
                             QNetworkRequest.AlwaysNetwork)
        if fileobj is not None or filename is not None:
            return self.fetch_request(request, filename, fileobj, page)
        q = self._prepare_question()
        q.default = urlutils.filename_from_url(request.url())
        message_bridge = objreg.get('message-bridge', scope='window',
                                    window=self._win_id)
        q.answered.connect(
            lambda fn: self.fetch_request(request, filename=fn, page=page))
        message_bridge.ask(q, blocking=False)
        return None

    def get_request(self, request, *, target=None,
                    suggested_fn=None, **kwargs):
        """Start a download with a QNetworkRequest.

        Args:
            request: The QNetworkRequest to download.
            target: Where to save the download as downloads.DownloadTarget.
            **kwargs: Passed to _fetch_request.

        Return:
            The created DownloadItem.
        """
        # WORKAROUND for Qt corrupting data loaded from cache:
        # https://bugreports.qt.io/browse/QTBUG-42757
        request.setAttribute(QNetworkRequest.CacheLoadControlAttribute,
                             QNetworkRequest.AlwaysNetwork)

        if suggested_fn is not None:
            pass
        elif request.url().scheme().lower() != 'data':
            suggested_fn = urlutils.filename_from_url(request.url())
        else:
            # We might be downloading a binary blob embedded on a page or even
            # generated dynamically via javascript. We try to figure out a more
            # sensible name than the base64 content of the data.
            origin = request.originatingObject()
            try:
                origin_url = origin.url()
            except AttributeError:
                # Raised either if origin is None or some object that doesn't
                # have its own url. We're probably fine with a default fallback
                # then.
                suggested_fn = 'binary blob'
            else:
                # Use the originating URL as a base for the filename (works
                # e.g. for pdf.js).
                suggested_fn = urlutils.filename_from_url(origin_url)

        if suggested_fn is None:
            suggested_fn = 'qutebrowser-download'

        return self._fetch_request(request,
                                   target=target,
                                   suggested_filename=suggested_fn,
                                   **kwargs)

    def get_request(self, request, *, fileobj=None, filename=None,
                    prompt_download_directory=None, **kwargs):
        """Start a download with a QNetworkRequest.

        Args:
            request: The QNetworkRequest to download.
            fileobj: The file object to write the answer to.
            filename: A path to write the data to.
            prompt_download_directory: Whether to prompt for the download dir
                                       or automatically download. If None, the
                                       config is used.
            **kwargs: Passed to fetch_request.

        Return:
            If the download could start immediately, (fileobj/filename given),
            the created DownloadItem.

            If not, None.
        """
        if fileobj is not None and filename is not None:
            raise TypeError("Only one of fileobj/filename may be given!")
        # WORKAROUND for Qt corrupting data loaded from cache:
        # https://bugreports.qt.io/browse/QTBUG-42757
        request.setAttribute(QNetworkRequest.CacheLoadControlAttribute,
                             QNetworkRequest.AlwaysNetwork)
        suggested_fn = urlutils.filename_from_url(request.url())

        if prompt_download_directory is None:
            prompt_download_directory = config.get(
                'storage', 'prompt-download-directory')
        if not prompt_download_directory and not fileobj:
            filename = config.get('storage', 'download-directory')

        if fileobj is not None or filename is not None:
            return self.fetch_request(request,
                                      fileobj=fileobj,
                                      filename=filename,
                                      suggested_filename=suggested_fn,
                                      **kwargs)
        if suggested_fn is None:
            suggested_fn = 'qutebrowser-download'
        else:
            encoding = sys.getfilesystemencoding()
            suggested_fn = utils.force_encoding(suggested_fn, encoding)
        q = self._prepare_question()
        q.default = _path_suggestion(suggested_fn)
        message_bridge = objreg.get('message-bridge', scope='window',
                                    window=self._win_id)
        q.answered.connect(
            lambda fn: self.fetch_request(request,
                                          filename=fn,
                                          suggested_filename=suggested_fn,
                                          **kwargs))
        message_bridge.ask(q, blocking=False)
        return None

    def get_request(self, request, *, fileobj=None, filename=None,
                    prompt_download_directory=None, **kwargs):
        """Start a download with a QNetworkRequest.

        Args:
            request: The QNetworkRequest to download.
            fileobj: The file object to write the answer to.
            filename: A path to write the data to.
            prompt_download_directory: Whether to prompt for the download dir
                                       or automatically download. If None, the
                                       config is used.
            **kwargs: Passed to fetch_request.

        Return:
            If the download could start immediately, (fileobj/filename given),
            the created DownloadItem.

            If not, None.
        """
        if fileobj is not None and filename is not None:
            raise TypeError("Only one of fileobj/filename may be given!")
        # WORKAROUND for Qt corrupting data loaded from cache:
        # https://bugreports.qt.io/browse/QTBUG-42757
        request.setAttribute(QNetworkRequest.CacheLoadControlAttribute,
                             QNetworkRequest.AlwaysNetwork)

        suggested_fn = urlutils.filename_from_url(request.url())
        if suggested_fn is None:
            suggested_fn = 'qutebrowser-download'

        # We won't need a question if a filename or fileobj is already given
        if fileobj is None and filename is None:
            filename, q = ask_for_filename(
                suggested_fn, self._win_id, parent=self,
                prompt_download_directory=prompt_download_directory
            )

        if fileobj is not None or filename is not None:
            return self.fetch_request(request,
                                      fileobj=fileobj,
                                      filename=filename,
                                      suggested_filename=suggested_fn,
                                      **kwargs)
        q.answered.connect(
            lambda fn: self.fetch_request(request,
                                          filename=fn,
                                          suggested_filename=suggested_fn,
                                          **kwargs))
        self._postprocess_question(q)
        q.ask()
        return None

    def get_request(self, request, page=None, fileobj=None, filename=None,
                    auto_remove=False):
        """Start a download with a QNetworkRequest.

        Args:
            request: The QNetworkRequest to download.
            page: The QWebPage to use.
            fileobj: The file object to write the answer to.
            filename: A path to write the data to.
            auto_remove: Whether to remove the download even if
                         ui -> remove-finished-downloads is set to false.

        Return:
            If the download could start immediately, (fileobj/filename given),
            the created DownloadItem.

            If not, None.
        """
        if fileobj is not None and filename is not None:
            raise TypeError("Only one of fileobj/filename may be given!")
        # WORKAROUND for Qt corrupting data loaded from cache:
        # https://bugreports.qt-project.org/browse/QTBUG-42757
        request.setAttribute(QNetworkRequest.CacheLoadControlAttribute,
                             QNetworkRequest.AlwaysNetwork)
        suggested_fn = urlutils.filename_from_url(request.url())
        if fileobj is not None or filename is not None:
            return self.fetch_request(request, page, fileobj, filename,
                                      auto_remove, suggested_fn)
        if suggested_fn is None:
            suggested_fn = 'qutebrowser-download'
        else:
            encoding = sys.getfilesystemencoding()
            suggested_fn = utils.force_encoding(suggested_fn, encoding)
        q = self._prepare_question()
        q.default = _path_suggestion(suggested_fn)
        message_bridge = objreg.get('message-bridge', scope='window',
                                    window=self._win_id)
        q.answered.connect(
            lambda fn: self.fetch_request(request, page, filename=fn,
                                          auto_remove=auto_remove,
                                          suggested_filename=suggested_fn))
        message_bridge.ask(q, blocking=False)
        return None

def test_filename_from_url(qurl, output):
    assert urlutils.filename_from_url(qurl) == output

    def get_request(self, request, *, fileobj=None, filename=None,
                    prompt_download_directory=None, **kwargs):
        """Start a download with a QNetworkRequest.

        Args:
            request: The QNetworkRequest to download.
            fileobj: The file object to write the answer to.
            filename: A path to write the data to.
            prompt_download_directory: Whether to prompt for the download dir
                                       or automatically download. If None, the
                                       config is used.
            **kwargs: Passed to fetch_request.

        Return:
            If the download could start immediately, (fileobj/filename given),
            the created DownloadItem.

            If not, None.
        """
        if fileobj is not None and filename is not None:
            raise TypeError("Only one of fileobj/filename may be given!")
        # WORKAROUND for Qt corrupting data loaded from cache:
        # https://bugreports.qt.io/browse/QTBUG-42757
        request.setAttribute(QNetworkRequest.CacheLoadControlAttribute,
                             QNetworkRequest.AlwaysNetwork)

        if request.url().scheme().lower() != 'data':
            suggested_fn = urlutils.filename_from_url(request.url())
        else:
            # We might be downloading a binary blob embedded on a page or even
            # generated dynamically via javascript. We try to figure out a more
            # sensible name than the base64 content of the data.
            origin = request.originatingObject()
            try:
                origin_url = origin.url()
            except AttributeError:
                # Raised either if origin is None or some object that doesn't
                # have its own url. We're probably fine with a default fallback
                # then.
                suggested_fn = 'binary blob'
            else:
                # Use the originating URL as a base for the filename (works
                # e.g. for pdf.js).
                suggested_fn = urlutils.filename_from_url(origin_url)

        if suggested_fn is None:
            suggested_fn = 'qutebrowser-download'

        # We won't need a question if a filename or fileobj is already given
        if fileobj is None and filename is None:
            filename, q = ask_for_filename(
                suggested_fn, self._win_id, parent=self,
                prompt_download_directory=prompt_download_directory
            )

        if fileobj is not None or filename is not None:
            return self.fetch_request(request,
                                      fileobj=fileobj,
                                      filename=filename,
                                      suggested_filename=suggested_fn,
                                      **kwargs)
        q.answered.connect(
            lambda fn: self.fetch_request(request,
                                          filename=fn,
                                          suggested_filename=suggested_fn,
                                          **kwargs))
        self._postprocess_question(q)
        q.ask()
        return None

 def test_url_host(self):
     """Test with an URL with no path."""
     url = QUrl('http://qutebrowser.org/')
     self.assertEqual(urlutils.filename_from_url(url),
                      'qutebrowser.org.html')

 def test_invalid_url(self):
     """Test with an invalid QUrl."""
     self.assertEqual(urlutils.filename_from_url(QUrl()), None)

 def test_url_path(self):
     """Test with an URL with path."""
     url = QUrl('http://qutebrowser.org/test.html')
     assert urlutils.filename_from_url(url) == 'test.html'

 def test_invalid_url(self):
     """Test with an invalid QUrl."""
     assert urlutils.filename_from_url(QUrl()) is None