code: public static boolean isResponseModeTypeFormPost(final OAuthRegisteredService registeredService, final OAuth20ResponseModeTypes responseType) {
          return responseType == OAuth20ResponseModeTypes.FORM_POST || StringUtils.equalsIgnoreCase("post", registeredService.getResponseType());
      }
docs: Is response mode type form post?
  
  @param registeredService the registered service
  @param responseType      the response type
  @return the boolean