docs: public void post(String jsonBody, Integer expectedResponseCode) throws IOException {
      HttpURLConnection conn = getUrlConnection();
  
      try {
        // send post request with json body for the topology
        if (!NetworkUtils.sendHttpPostRequest(conn, NetworkUtils.JSON_TYPE, jsonBody.getBytes())) {
          throw new IOException("Failed to send POST to " + endpointURI);
        }
  
        // check the response
        if (!NetworkUtils.checkHttpResponseCode(conn, expectedResponseCode)) {
          byte[] bytes = NetworkUtils.readHttpResponse(conn);
          LOG.log(Level.SEVERE, "Failed to send POST request to endpoint");
          LOG.log(Level.SEVERE, new String(bytes));
          throw new IOException("Unexpected response from connection. Expected "
              + expectedResponseCode + " but received " + conn.getResponseCode());
        }
      } finally {
        conn.disconnect();
      }
    }