Fix Google PageSpeed leverage browser caching in htaccess

To optimize browser caching in htaccess, simply add the following code inspired by a Stack Overflow thread [1] in your htaccess file :

It will allow you not only to pass the Google PageSpeed leverage browser caching test, but most importantly to speed up your website access time.

For example, this allowed me to pass the  Google PageSpeed   [2] test leverage browser caching [3] (along with Eliminate render-blocking JavaScript and CSS in above-the-fold content [4]) on a website, going up from a score of 51 on mobile (Fig 1) to 72 (Fig 2), and up from 59 (Fig 3) to 79 on desktop (Fig 4).