code: def set_headers(self, headers):
          
          self.request["headers"].update(self._input_object(headers))
          return self.request["headers"]
docs: *Sets new request headers or updates the existing.*
  
          ``headers``: The headers to add or update as a JSON object or a
          dictionary.
  
          *Examples*
  
          | `Set Headers` | { "authorization": "Basic QWxhZGRpbjpPcGVuU2VzYW1"} |
          | `Set Headers` | { "Accept-Encoding": "identity"} |
          | `Set Headers` | ${auth_dict} |