title: Blank page and error with only a specific url with pyqt webview in python
body: <p>I have got an issue when using this following code with a specific url only:</p>
  
  <pre><code>import sys
  from PyQt4.QtGui import QApplication
  from PyQt4.QtCore import QUrl
  from PyQt4.QtWebKit import QWebView,QWebSettings
  
  
  class Browser(QWebView):
  
      def __init__(self):
          QWebView.__init__(self)
          Settings = self.settings()
          Settings.setAttribute(QWebSettings.JavascriptEnabled, True)
          Settings.setAttribute(QWebSettings.JavaEnabled, True)
          Settings.setAttribute(QWebSettings.PluginsEnabled, True)
          Settings.setAttribute(QWebSettings.AutoLoadImages, True)
          self.loadFinished.connect(self._result_available)
  
      def _result_available(self, ok):
          frame = self.page().mainFrame()
          print unicode(frame.toHtml()).encode('utf-8')
  
  if __name__ == '__main__':
      app = QApplication(sys.argv)
      view = Browser()
  
      from_url=True
      url_to_view='https://www.twitch.tv/'
      if from_url==True:
          view.load(QUrl(url_to_view))
  
      view.show()
      app.exec_()
  </code></pre>
  
  <p>When running this code I get a blank page and this error:</p>
  
  <pre><code>QNetworkReplyImplPrivate::error: Internal problem, this method must only be called once.
  QNetworkReplyImplPrivate::error: Internal problem, this method must only be called once.
  </code></pre>
  
  <p>It is very strange because I have got this issue only with the <a href="https://www.twitch.tv/" rel="nofollow noreferrer">https://www.twitch.tv/</a> url. I had try to replace url with <a href="https://www.google.com" rel="nofollow noreferrer">https://www.google.com</a> or anything else and it works fine.</p>
  
  <p>I was expecting that it was relative to <code>python2</code> and <code>PyQt4</code>, but I have got the same issue when running on <code>python3</code> and <code>PyQt5</code> implementation</p>
  
  <p>Someone could help me to properly load the page with pyqt ?</p>