auto request = XMLHttpRequest::create();
    request->open("GET", "resource.bin", true);
    static EventHandler onload = [request](Event *e) {
        ArrayBuffer *arraybuf = request->response;
        auto array = Uint8Array::create(arraybuf);
        size_t len = array->length;
        uint8_t rawbuf[len];
        for (size_t i = 0; i < len; ++i) {
            uint8_t ch = (*array)[i];
            rawbuf[i] = ch;
        }
    };
    request->onload = &onload;
    request->responseType = XMLHttpResponseType::ARRAY_BUFFER;
    request->send();