docs: public Connection submit() {
          String action = hasAttr("action") ? absUrl("action") : baseUri();
          Validate.notEmpty(action, "Could not determine a form action URL for submit. Ensure you set a base URI when parsing.");
          Connection.Method method = attr("method").toUpperCase().equals("POST") ?
                  Connection.Method.POST : Connection.Method.GET;
  
          return Jsoup.connect(action)
                  .data(formData())
                  .method(method);
      }