How do I set the User-Agent for a QNetworkRequest in PyQtWebkit?

I'm trying to set the header开发者_运维问答 "User-Agent" in my little webkit-browser, but I did not get.

That piece of code:

self.web = QtWebKit.QWebView(self)
...
self.request = QNetworkRequest() 
self.request.setUrl(url) 
self.request.setRawHeader("User-Agent", QtCore.QByteArray ("TestUserAgent")) 
self.request.setRawHeader("Accept-Language", QtCore.QByteArray ("en ,*")) 
self.web.load(self.request) 

In this example, "Accept-Language" is set correctly, but the "User-Agent" is always the default value. Tell me please, why? How do I set the "User-Agent"?

Thanks for help.

---

QWebView overrides the QNetworkRequest field and sets the User-Agent header appropriate for the version of WebKit you are using. To change this default behavior you must inherit from QWebPage, reimplement QWebPage.userAgentForUrl and set the page for your QWebView instances to an instance of your new QWebPage type using QWebView.setPage.

---

Ok, I figure out now :

class Browser(QtWebKit.QWebPage):
    def __init__(self):
        super(QtWebKit.QWebPage, self).__init__()

    def userAgentForUrl(self, url):
        return "Mozilla/5.0 (X11; Linux x86_64; rv:7.0.1) Gecko/20100101 Firefox/7.0.1"

(it's an example)

Thanks to http://www.riverbankcomputing.com/pipermail/pyqt/2011-May/029826.html and http://pastebin.com/m1b350244