docs: @Override
      public Enumeration<String> getParameterNames() {
          Set<String> paramNames = new HashSet<String>();
          Enumeration<String> paramEnum = super.getParameterNames();
          while (paramEnum.hasMoreElements()) {
              paramNames.add((String) paramEnum.nextElement());
          }
          paramNames.addAll(getMultipartParameters().keySet());
          return Collections.enumeration(paramNames);
      }