docs: public static OAuth20ResponseModeTypes getResponseModeType(final J2EContext context) {
          val responseType = context.getRequestParameter(OAuth20Constants.RESPONSE_MODE);
          val type = Arrays.stream(OAuth20ResponseModeTypes.values())
              .filter(t -> t.getType().equalsIgnoreCase(responseType))
              .findFirst()
              .orElse(OAuth20ResponseModeTypes.NONE);
          LOGGER.debug("OAuth response type is [{}]", type);
          return type;
      }