Send request details to logging system.

def log_request(self, extra=''):
        """
        Send request details to logging system.
        """

        # pylint: disable=no-member
        thread_name = threading.currentThread().getName().lower()
        # pylint: enable=no-member
        if thread_name == 'mainthread':
            thread_name = ''
        else:
            thread_name = '-%s' % thread_name

        if self.config['proxy']:
            if self.config['proxy_userpwd']:
                auth = ' with authorization'
            else:
                auth = ''
            proxy_info = ' via %s proxy of type %s%s' % (
                self.config['proxy'], self.config['proxy_type'], auth)
        else:
            proxy_info = ''
        if extra:
            extra = '[%s] ' % extra
        logger_network.debug(
            '[%s%s] %s%s %s%s',
            ('%02d' % self.request_counter
             if self.request_counter is not None else 'NA'),
            thread_name,
            extra, self.request_method or 'GET',
            self.config['url'], proxy_info)