How to enable CORS setting for a HTML5 workspace?



Hello everyone,

I'm having some trouble for Cross-origin resource sharing for the sever side and guess if anyone can give me some help.
I have created a html5 workspace and would like to have this workspace as a server recently and to visit the files I put on it from other web sites. Here I need to use the CORS setting and it demands that the server side implements CORS interface. Does Cloud9 enable us to set CORS interface? If so, where can I find information on how to set the CORS? 
Thank you quite a lot~