You can use the curl command to check if a website is using gzip or deflate compression. The curl command will send an HTTP request to a website and display the headers in the response. You can then look for the Content-Encoding header to see if the website is using gzip or deflate compression.
Here’s an example of how to check if a website is using gzip or deflate compression:
curl -I https://example.com
This will return the headers of the response from the website https://example.com. Look for the Content-Encoding header in the output:
HTTP/2 200
server: nginx
date: Mon, 08 Feb 2023 19:25:11 GMT
content-type: text/html; charset=UTF-8
content-encoding: gzip
In this example, the website is using gzip compression. If the header is not present or if it has a different value, the website is not using gzip or deflate compression.