Is it possible to leverage browser caching? I have ran a site through Google Page speed insights and one of its recommendations is to leverage browser caching for https://www.google-analytics.com/analytics.js.

Is this possible on a Drupal site?
If you have a .htaccess file, you can add the following code at the top of it:

## EXPIRES CACHING ##
&lt;IfModule mod_expires.c&gt;
ExpiresActive On
ExpiresByType image/jpg "access 1 year"
ExpiresByType image/jpeg "access 1 year"
ExpiresByType image/gif "access 1 year"
ExpiresByType image/png "access 1 year"
ExpiresByType text/css "access 1 month"
ExpiresByType text/html "access 1 month"
ExpiresByType application/pdf "access 1 month"
ExpiresByType text/x-javascript "access 1 month"
ExpiresByType application/x-shockwave-flash "access 1 month"
ExpiresByType image/x-icon "access 1 year"
ExpiresDefault "access 1 month"
&lt;/IfModule&gt;
## EXPIRES CACHING ##