code: def _prepare_headers(self, additional_headers=None, **kwargs):
          
          user_agent = "pyseaweed/{version}".format(version=__version__)
          headers = {"User-Agent": user_agent}
          if additional_headers is not None:
              headers.update(additional_headers)
          return headers
docs: Prepare headers for http communication.
  
          Return dict of header to be used in requests.
  
          Args:
              .. versionadded:: 0.3.2
                  **additional_headers**: (optional) Additional headers
                  to be used with request
  
          Returns:
              Headers dict. Key and values are string