[PyQt] referer in javascript still blank

[Peter Irbizon]

Hello,
I am trying to set Referrer for my script this way:

class NetworkManager(QNetworkAccessManager):
    def createRequest(self, op, req, outgoing_data):
        req.setRawHeader('Referer', 'http://www.my-university.com/')
        req.setRawHeader('Accept-Language', 'en')
        return super(NetworkManager, self).createRequest(op, req,
outgoing_data)

but when I use javascript document.write('js ref: ' + document.referrer
+'<br>'); on my website it still returns empty line.
When I use php $_SERVER["HTTP_REFERER"] it returns correct referer.

How should I make it working for javascript as well?
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