[PyQt] Different QWebView objects gives identical output for same urls

[Герасимов Михаил]

I found that if we load one url with different QWebView objects 
parallely, we will have identical output: only one of this QWebView will 
make real request. Here is example:

> from PyQt5.QtCore import QUrl
> from PyQt5.QtWidgets import QApplication
> from PyQt5.QtWebKitWidgets import QWebView
>
> def load_and_print(url):
>     view = QWebView()
>     view.load(QUrl(url))
>     def on_ready(ok):
> print(view.page().mainFrame().documentElement().toPlainText())
>     view.loadFinished.connect(on_ready)
>
> if __name__ == '__main__':
>     app = QApplication([])
>
>     # This url outputs random number:
>     url = 
> 'https://www.random.org/integers/?num=1&min=1&max=100&col=1&base=10&format=plain&rnd=new'
>     load_and_print(url)
>     load_and_print(url)
>
>     app.exec_()
>
>     # output:
>     # 39
>     # 39

It was surprising. How can we get "fair", unique output for each 
QWebView object, If url is the same?