public RawAPIResponse callPostAPI(String relativeUrl, HttpParameter... parameters) throws FacebookException {
        ensureAuthorizationEnabled();

        String path = relativeUrl;
        if (relativeUrl.startsWith("/")) {
            path = relativeUrl.substring(1);
        }

        HttpResponse res;
        if (parameters != null && parameters.length > 0) {
            res = post(buildEndpoint(path), parameters);
        } else {
            res = post(buildEndpoint(path));
        }

        // not supports "JSONStore" option because this method returns the json object itself.
        return new RawAPIResponseImpl(res);
    }