code: def _build_url(self, path):
          
          if path.startswith('http://') or path.startswith('https://'):
              return path
          else:
              return '%s%s' % (self._url, path)
docs: Returns the full url from path.
  
          If path is already a url, return it unchanged. If it's a path, append
          it to the stored url.
  
          Returns:
              str: The full URL