URL for local sub-domains and/or locale from the domain name testing

gistfile1.txt

If you want to test rails applications (or any web applications) locally with sub-domains and/or setting the locale 
from the domain name as describe in Rails' guides
http://guides.rubyonrails.org/i18n.html#setting-the-locale-from-the-domain-name you have multiple options:

- Edit your /etc/hosts file, that sucks! you need admin access and you'll pollute. DO NOT DO THAT!
- Use passenger (and passenger pane if you are on Mac OS X), but you need to enter manually all aliases 
in your apache/nginx config file. painfull
- use those URLs 127localhost.com and 127localhost.fr. DNS for all subdomains are setup to IP 127.0.0.1

Nothing to setup/modify locally, just:

- start your webserver ('./script/server' for rails 2 and 'rails s' for rails 3)
- and open your browser on
    * http://127localhost.com:3000
    * or http://127localhost.fr:3000
    * or http://username.127localhost.fr:3000
    * ...


I read something like this few months ago but I couldn't find the article neither remember the URL. 
And it was only on .com so unusable for testing locale from the domain.

I hope those URLs (à la 37signals or 43things) are easier to remind :)
Happy testing

Seb