Android Studio中DownloadManager下载Zip文件遇证书信任锚问题求助

我刚接触Android Studio开发不久，尝试从互联网下载Zip文件，但折腾了好几个小时都没成功，收到DownloadManager相关错误提示，详情如下：

实现文件下载的方法代码 #

//该方法由前台服务调用，我也尝试在MainActivity中调用，但同样无效
private static void DownloadFile(String fileUrl, Service service){
    Log.w("Utility", "martinPrank, DownloadFile invoked from service, fileUrl: "+fileUrl);
    DownloadManager.Request request = new DownloadManager.Request(Uri.parse(fileUrl));
    request.setAllowedNetworkTypes(DownloadManager.Request.NETWORK_MOBILE | DownloadManager.Request.NETWORK_WIFI);
    request.setTitle("Download");
    request.setDescription("Download file di sistema in corso...");

    String[] urlWordArray = fileUrl.split("/");
    String fileName = urlWordArray[urlWordArray.length-1];

    request.allowScanningByMediaScanner();
    request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE);
    request.setDestinationInExternalPublicDir(Environment.DIRECTORY_DOWNLOADS, fileName);

    DownloadManager downloadManager = (DownloadManager) service.getSystemService(Context.DOWNLOAD_SERVICE);
    downloadManager.enqueue(request);
    Log.w("Utility", "martinPrank, The download of the file should start!");
}

Android Studio Logcat日志 #

2023-12-12 19:36:48.363  1998-2117  Utility                 com.patrickcreations.myapplication   W  martinPrank, DownloadFile invoked from service, fileUrl: https://www.trentinotrasporti.it/opendata/google_transit_urbano_tte.zip
2023-12-12 19:36:48.370  1463-1679  ActivityManager         pid-1463                             I  Changes in 10074 10 to 3, 0 to 8
2023-12-12 19:36:48.425  5835-7230  DownloadManager         pid-5835                             W  Path appears to be invalid: /storage/emulated/0/Download/google_transit_urbano_tte.zip
2023-12-12 19:36:48.477  1463-1679  ConnectivityManager     pid-1463                             D  StackLog: [android.net.ConnectivityManager.sendRequestForNetwork(ConnectivityManager.java:4191)] [android.net.ConnectivityManager.registerDefaultNetworkCallbackForUid(ConnectivityManager.java:4755)] [com.android.server.job.controllers.ConnectivityController.registerPendingUidCallbacksLocked(ConnectivityController.java:856)] [com.android.server.job.controllers.ConnectivityController.maybeRegisterDefaultNetworkCallbackLocked(ConnectivityController.java:830)] [com.android.server.job.controllers.ConnectivityController.updateConstraintsSatisfied(ConnectivityController.java:1045)] [com.android.server.job.controllers.ConnectivityController.maybeStartTrackingJobLocked(ConnectivityController.java:263)] [com.android.server.job.JobSchedulerService.startTrackingJobLocked(JobSchedulerService.java:1754)] [com.android.server.job.JobSchedulerService.scheduleAsPackage(JobSchedulerService.java:1233)] [com.android.server.job.JobSchedulerService$JobSchedulerStub.scheduleAsPackage(JobSchedulerService.java:3167)] [android.app.job.IJobScheduler$Stub.onTransact(IJobScheduler.java:181)]
2023-12-12 19:36:48.477  1463-1679  ConnectivityService     pid-1463                             D  requestNetwork for uid/pid:1000/1463 asUid: 11154 activeRequest: null callbackRequest: 4061 [NetworkRequest [ REQUEST id=4062, [ Capabilities: INTERNET&NOT_RESTRICTED&TRUSTED&NOT_VCN_MANAGED Uid: 11154 RequestorUid: 1000 RequestorPkg: android UnderlyingNetworks: Null] ]] callback flags: 0 order: 2147483647
2023-12-12 19:36:48.478  1463-1757  ConnectivityService     pid-1463                             D     accepting network in place of null
2023-12-12 19:36:48.480  1998-2117  Utility                 com.patrickcreations.myapplication   W  martinPrank, The download of the file should start!

更新：我在Logcat中发现新错误：

2023-12-12 19:36:48.726  5835-2154  DownloadManager         pid-5835                             W  [1414] Stop requested with status HTTP_DATA_ERROR: java.security.cert.CertPathValidatorException: Trust anchor for certification path not found.
2023-12-12 19:36:48.727  5835-2154  DownloadManager         pid-5835                             D  [1414] Finished with status WAITING_TO_RETRY
2023-12-12 19:36:48.727  5835-2154  DownloadManager         pid-5835                             V  MIME Type = null

实际问题应该是网站的信任锚问题，我测试下载其他网站的PDF可以正常完成！

请问问题是否出在我要下载Zip文件的目标服务器上？

内容的提问来源于stack exchange，提问作者Patrick Moling