Here is my situation:
I have created a QWebview, loaded a Youtube page, and logged in. 
I select upload option (http://www.youtube.com/my_videos_upload), and choose
a video to upload. However, youtube always returns 

"The server has returned an invalid response. Please follow these steps and try uploading the file again."

How can I solve that problem?
Thanks.

EDIT: the code I'm using is:

<pre>    import sys
    from PyQt4.QtCore import QUrl
    from PyQt4.QtGui import QApplication
    from PyQt4.QtWebKit import QWebView
    from PyQt4.QtNetwork import QNetworkAccessManager
    from PyQt4 import QtCore
    
    def fillForm(web, username, password):
        print "Filling in the form"
        doc = web.page().mainFrame().documentElement()
        
        print "Finding username tag"
        user = doc.findFirst("input[id=Email]")
        print "Finding passwd tag"
        passwd = doc.findFirst("input[id=Passwd]")    
        
        print "Setting information"
        user.evaluateJavaScript("this.value = '%s'" % username)
        passwd.evaluateJavaScript("this.value = '%s'" % password)    
        button = doc.findFirst("input[id=signIn]")
        button.evaluateJavaScript("this.click()")
              
    def doLogin(web, url, username, password):        
        web.loadFinished.connect(lambda: fillForm(web, username, password))
        web.load(url)
        web.show()
    
    if __name__ == "__main__":
        app = QApplication(sys.argv)
        nam = QNetworkAccessManager()
        web = QWebView()
        web.page().setNetworkAccessManager(nam)
        url = QUrl(r"https://accounts.google.com/Login")
        username = "name"
        password = "pass"
        doLogin(web, url, username, password)
        app.exec_()</pre>



        
        
        
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