Return the full path to ``path`` by prepending the SCRIPT_NAME.
        
        If ``path`` is a URL, do nothing.

def _get_full_path(self, path, environ):
        """
        Return the full path to ``path`` by prepending the SCRIPT_NAME.
        
        If ``path`` is a URL, do nothing.
        
        """
        if path.startswith('/'):
            path = environ.get('SCRIPT_NAME', '') + path
        return path