docs: def _add_resposne_headers(self, django_response, devil_response):
          """ Add response headers.
  
          Add HTTP headers from devil's response to django's response.
          """
  
          try:
              headers = devil_response.headers
          except AttributeError:
              # ok, there was no devil_response
              pass
          else:
              for k, v in headers.items():
                  django_response[k] = v
          return django_response