docs: def _send_file(self, method, path, data, filename):
          """Make a multipart/form-encoded request.
  
          Args:
              `method`: The method of the request (POST or PUT).
              `path`: The path to the resource.
              `data`: The JSON-encoded data.
              `filename`: The filename of the file to send.
          Returns:
              The content of the response.
          Raises:
              An exception depending on the HTTP status code of the response.
          """
          with open(filename, 'r') as f:
              return self._make_request(method, path, data=data, files=[f, ])