public IPolicyProbeResponse probePolicy(String orgId, String apiId, String apiVersion, int idx) throws GatewayAuthenticationException {
        return probePolicy(orgId, apiId, apiVersion, idx, "", "");
    }
Constructor.
@param endpoint the endpoint
@param httpClient the http client
manager/api/gateway/src/main/java/io/apiman/manager/api/gateway/rest/GatewayClient.java