This is a quick method with using cURL to check that Apache Compression with mod_gzip and mod_deflate is working. Only the remote server headers are needed.

Check that the Apache Compression is Working

Get headers

curl -I -H 'Accept-Encoding: gzip,deflate' http://www.if-not-true-then-false.com

-I option which will make just HEAD request to server and get headers.
-H option add header for accecpt content-encondig gzip and deflate.

Check headers

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By default almost all Apache installation shows sensitive server information with Apache version number, server operating system details, installed Apache modules, PHP-version and so on. Attackers can use this information when performing attacks.

Some examples howto check server information that Apache sends