exposing localhost websites, MacOS

• Open Sharing in System Preferences;
• Select the Services tab;
• Select Web Sharing — this will allow internal webpages to be accessed externally, as per the description of the setting;
• See your address appear in that page, test it.

Simple!
And now I can use VMWare to test my rails app in IE (that wretched browser...) by just visiting http://10.1.1.9:3000.

Via MacInstruct.