On Apr 18, 2012, at 6:10 AM, shinn wrote:

> Hi all,
> 
> I'm currently developing a rails app that required to do cross side scripting with ajax. I've been google around and found this rack middleware that used rack on doing proxy. However I have no idea on how to use it in my app. Please help, I'm using Rails 3.2.3. Thanks!

http://guides.rubyonrails.org/rails_on_rack.html

It sounds like you probably want CORS though, not a proxy.

http://blog.davelyon.net/cross-origin-resource-sharing-on-rails
http://www.tsheffler.com/blog/?p=428
http://www.google.com/search?q=CORS+on+rails