Apache : RewriteRule vs Alias

A small note on order of execution of a RewriteRule directive and a folder Alias on Apache HTTPD – RewriteRule is always executed before the Alias, thus making a rewrite shown in the listing below possible –

Alias /assets/ "//contenthost/assets/"
<Directory "//contenthost/assets">
AllowOverride None
Options None
Order allow,deny
Allow from all

RewriteCond %{HTTP_REFERER} !^http://mydomain.com.*$ [NC]
RewriteRule (.*)/assets/* - [F]

This will make sure that if calls to /assets/ are not coming from our domain, they are rejected; else they will be picked from the aliased folder “//contenthost/assets”

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