Java不支持的内容编码：br

Question

我正在尝试修复一个通过URL处理html页面并获取内容字节的Java应用

// this a simplified part of code

private static final Pattern PAT_CHARSET = Pattern.compile("charset=([^; ]+)$");

HttpURLConnection conn = (HttpURLConnection) url.openConnection();
String ct = conn.getContentType();
Charset cs = Charset.forName("utf-8");
String encoding;
  if (ct != null) {
    Matcher in = PAT_CHARSET.matcher(ct);
    if (in.find()) {
      encoding = in.group(1);
      cs = Charset.forName(encoding);
    }
  }

Object in1 = conn.getInputStream();
encoding = conn.getContentEncoding();
if (encoding != null) {
  if ("gzip".equalsIgnoreCase(encoding)) {
    in1 = new GZIPInputStream((InputStream) in1);
  }
}

...

但是对于某些网址，我会收到此错误

unsupported Content-Encoding: br