Why not use "http://localhost/" as an absolute path ?

When launching an outersite, SilAMP chooses an available port to run the web server. Since port 80 is not always free, the URL of your outersite becomes "http://localhost:PORT_NUMBER/", for instance "http://localhost:8080/".

Quite a good reason to avoid using "http://localhost/" as an absolute path for your outersites, isn't it?