FastCGI (or in my case, mod_fcgid plus the FastCGI dev kit) runs the script public/dispatch.fcgi in your Rails application. If you're having problems getting it to run right, try this.

The dispatch.fcgi script normally looks like this:

#!/usr/bin/ruby
require File.dirname(__FILE__) + "/../config/environment"
require 'fcgi_handler'

RailsFCGIHandler.process!

Edit it so that it looks like this:

#!/usr/bin/ruby
require File.dirname(__FILE__) + "/../config/environment"
FCGI_PURE_RUBY = true
require 'fcgi_handler'

RailsFCGIHandler.process!

That one change might make it work right for you.