Easy URL shortener for Apache

In httpd.conf:

RewriteEngine On RewriteMap urlshort txt:/path/to/file/map.txt RewriteRule ^/s/([a-zA-Z0-9]+)$ ${urlshort:$1} [R]

in map.txt:

abcdef [http://www.foo.com/blah/](http://www.foo.com/blah/)bcdefg...