'Process the form submission, initating OpenID verification.'

def doVerify(self):

    openid_url = self.query.get('openid_identifier')
    if (not openid_url):
        self.render('Enter    an    OpenID    Identifier    to    verify.', css_class='error', form_contents=openid_url)
        return
    immediate = ('immediate' in self.query)
    use_sreg = ('use_sreg' in self.query)
    use_pape = ('use_pape' in self.query)
    use_stateless = ('use_stateless' in self.query)
    oidconsumer = self.getConsumer(stateless=use_stateless)
    try:
        request = oidconsumer.begin(openid_url)
    except consumer.DiscoveryFailure as exc:
        fetch_error_string = ('Error    in    discovery:    %s' % cgi.escape(str(exc[0])))
        self.render(fetch_error_string, css_class='error', form_contents=openid_url)
    else:
        if (request is None):
            msg = ('No    OpenID    services    found    for    <code>%s</code>' % (cgi.escape(openid_url),))
            self.render(msg, css_class='error', form_contents=openid_url)
        else:
            if use_sreg:
                self.requestRegistrationData(request)
            if use_pape:
                self.requestPAPEDetails(request)
            trust_root = self.server.base_url
            return_to = self.buildURL('process')
            if request.shouldSendRedirect():
                redirect_url = request.redirectURL(trust_root, return_to, immediate=immediate)
                self.send_response(302)
                self.send_header('Location', redirect_url)
                self.writeUserHeader()
                self.end_headers()
            else:
                form_html = request.htmlMarkup(trust_root, return_to, form_tag_attrs={'id': 'openid_message'}, immediate=immediate)
                self.wfile.write(form_html)
