[Rails] Metal - How can i do to implement the same effect in Rails3?

--------------code-begin----------------
# Allow the metal piece to run in isolation
require(File.dirname(__FILE__) + "/../../config/environment") unless
defined?(Rails)

class Accelerator
def self.call(env)
if env["PATH_INFO"] =~ /^\/accelerator/
[200, {"Content-Type" => "text/html"}, ["Hello, World!"]]
else
[404, {"Content-Type" => "text/html"}, ["Not Found"]]
end
end
end
--------------code-end------------------
with the code i can process every request without configure rails
router. how can i do the same thing in rails3?

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