How To Understand A Website Is Using Gzip Compression?

I am trying to check any website is using gzip or not? I found this explanation on Nibbler, We check if pages use GZIP compression for smaller page sizes and faster downloading

Solution 1:

Open chrome Developer Tools

Go to the "Network" tab and reload the page.

Choose the appropriate page/file on the left

then the "Headers" tab on the right pane.

Under "Response Headers" you should see "Content-Encoding: gzip"

Solution 2:

URL uri = newURL(url);
HttpURLConnection connection = (HttpURLConnection) uri.openConnection();
connection.setRequestProperty("Accept-Encoding","gzip");
Map<String, List<String>> map = connection.getHeaderFields();
for (Map.Entry<String, List<String>> entry : map.entrySet()) {
    System.out.println("Key : " + entry.getKey() +
        " ,Value : " + entry.getValue());
}

Content-Encoding with value [] will be printed.