Gemfile

source "http://rubygems.org"

gem 'goliath', :git => "git://github.com/postrank-labs/goliath.git"

no_routes.rb

require 'bundler/setup'
require 'goliath'
class HelloWorld < Goliath::API
  def response(env)
    [200, {}, "Hello world"]
  end
end

class NoRoutes < Goliath::API
  map '/some_route', HelloWorld
end

output

» ruby no_routes.rb -sv
[7874:INFO] 2011-07-05 15:25:42 :: Starting server on 0.0.0.0:9000 in development mode. Watch out for stones.

# request to http://localhost:9000/some_route

[7874:INFO] 2011-07-05 15:26:17 :: Status: 200, Content-Length: 11, Response Time: 15.28ms

# request to http://localhost:9000

[7874:ERROR] 2011-07-05 15:25:49 :: stack level too deep
/Users/jamesalmond/.rvm/rubies/ruby-1.9.2-p180/lib/ruby/1.9.1/set.rb:92
[7874:INFO] 2011-07-05 15:25:49 :: Status: 500, Content-Length: 17, Response Time: 26.48ms