无法以正确的编码从 url 读取 js 文件

Can't read js file from url in correct encoding

我想从 url https://d3c3cq33003psk.cloudfront.net/opentag-67008-473432.js

中读取 js 文件作为字符串

我尝试了几种方法(从 url 读取或下载然后读取),但一直收到无法读取的字符,例如 ��(��_��s�������� ��:`����.����i....
我尝试的方式:
1. 从 url:

下载文件
FileUtils.copyURLToFile(jsUrl, file);

2。阅读 url:

    StringBuilder sb = new StringBuilder();
    try {
        URL url = new URL(jsUrl);
        // read text returned by server
        BufferedReader in = new BufferedReader(new InputStreamReader(url.openStream(), "UTF-8"));
        String line;
        while ((line = in.readLine()) != null) {
            sb.append(line).append("\n");
        }
        in.close();
    } catch (Exception e) {
    }
    return sb.toString();

如果我从 url(页面-> 另存为...)手动下载文件 - 它可以使用普通 UTF-8 编码的 Notepad++ 打开。
谁能帮我处理这个奇怪的文件?

已压缩。使用 GZIPInputStream.

更新

        InputStream stream = url.openStream();
        if ("gzip".equalsIgnoreCase(cnt.getHeaderField("Content-Encoding"))) {
            stream = new GZIPInputStream(stream);
        }
        BufferedReader in = new BufferedReader(new InputStreamReader(stream, "UTF-8"));

更新 2

使用 URLConnection:

        URLConnection cnt = url.openConnection();
        InputStream stream = cnt.getInputStream();
        if ("gzip".equalsIgnoreCase(cnt.getHeaderField("Content-Encoding"))) {
            stream = new GZIPInputStream(stream);
        }
        BufferedReader read = new BufferedReader(new InputStreamReader(stream, "UTF-8"));