docs: public GetDomainCacheTTLResponse getDomainCacheTTL(GetDomainCacheTTLRequest request) {
          checkNotNull(request, "The parameter request should NOT be null.");
          InternalRequest internalRequest = createRequest(request, HttpMethodName.GET, DOMAIN, request.getDomain(), "config");
          internalRequest.addParameter("cacheTTL","");
          return invokeHttpClient(internalRequest, GetDomainCacheTTLResponse.class);
      }