使用http网址顺利运行时，无法从https网址获取apk文件

Question

我想通过本地服务器更新我的应用。我已将我的应用程序放在服务器上，通过此代码我正在完成更新它的任务

 public class UpdateClass extends AsyncTask<String, String, String> {


    ProgressDialog progressDialog;
    int status = 0;

    private Context context;

    public void onPreExecute() {
        progressDialog = new ProgressDialog(Update.this);
        progressDialog.setMessage("Please Wait.......");
        progressDialog.show();

    }

    @Override
    protected String doInBackground(String... arg0) {
        try {
            URL url = new URL(arg0[0]);
            HttpURLConnection c = (HttpURLConnection) url.openConnection();
            c.setRequestMethod("GET");
            c.setDoOutput(true);
            c.connect();

         //   String PATH = Environment.getExternalStorageDirectory() + "/Download/";
            String dir = Environment.getExternalStorageDirectory().getAbsolutePath() +  "/Download/";

            System.out.println("path..........." + Environment.getExternalStorageDirectory());
            File file = new File(dir);
            file.mkdirs();
            File outputFile = new File(file, "location.apk");
            FileOutputStream fos = new FileOutputStream(outputFile);

            InputStream is = c.getInputStream();

            byte[] buffer = new byte[1024];
            int len1 = 0;
            while ((len1 = is.read(buffer)) != -1) {
                fos.write(buffer, 0, len1);
            }
            fos.close();
            is.close();

            Intent intent = new Intent(Intent.ACTION_VIEW);
            intent.setDataAndType(Uri.fromFile(new File(Environment.getExternalStorageDirectory() +
                    "/Download/" + "location.apk")), "application/vnd.android.package-archive");
            System.out.println("path........dsffffffffffffffsdfffff..." + Environment.getExternalStorageDirectory());

            intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
            startActivity(intent);


        } catch (FileNotFoundException fnfe) {
            status = 1;
    //               Toast.makeText(context, "App not Available",   Toast.LENGTH_LONG).show();
            Log.e("File", "FileNotFoundException! " + fnfe);

        } catch (Exception e) {
            //   Toast.makeText(context, "App update", Toast.LENGTH_LONG).show();
            Log.e("UpdateAPP", "Exception " + e);
        }
        return null;
    }


    public void onPostExecute(String unused) {
        progressDialog.dismiss();
      /*  if (status == 1)
            Toast.makeText(context, "App not Available",        Toast.LENGTH_LONG).show();
    }*/
    }
}

代码可以正常使用“http://localhost/androidservices/location.apk” 但是当我用我的服务器地址https://liveserver/androidservices/location.apk替换这个URL时，我在我的logcat和手机中找到了文件未找到异常，下载了一个大小为0 kb的文件名相同的文件。我可以通过浏览器访问该URL，因为使用浏览器（chrome，mozilla）打开时可以轻松下载该文件。