code: def do_HEAD(self):
          
          self.do_initial_operations()
          # the HEAD method is not present in CoAP, so we treat it
          # like if it was a GET and then we exclude the body from the response
          # with send_body=False we say that we do not need the body, because it is a HEAD request
          coap_response = self.client.get(self.coap_uri.path)
          self.client.stop()
          logger.info("Server response: %s", coap_response.pretty_print())
          self.set_http_header(coap_response)
docs: Perform a HEAD request