PreloadTask 内无法添加 header

[cipchk]

在 start 方法内，无法定义 header，我应该怎么处理？

//获取HttpProxyCacheServer的代理地址
proxyUrl = mCacheServer!!.getProxyUrl(mRawUrl)
val url = URL(proxyUrl)
connection = url.openConnection() as HttpURLConnection
connection.addRequestProperty("Referer", "test.com")

[Doikki]

    private static HttpProxyCacheServer newProxy(Context context) {
        return new HttpProxyCacheServer.Builder(context)
                .maxCacheSize(512 * 1024 * 1024)       // 512MB for cache
                //缓存路径，不设置默认在sd_card/Android/data/[app_package_name]/cache中
//                .cacheDirectory()
                // 加请求头
                .headerInjector()
                .build();
    }