NRuby

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require 'rack'
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class App
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  def self.call(env)
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    headers = { 'Content-Type' => 'text/plain' }
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    code = 200
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    body = 'Hello, world!'
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    unless env['PATH_INFO'] == '/'
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      code = 404
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      body = 'Not Found'
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    end
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    headers['Content-Length'] = body.length.to_s
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    [code, headers, [body]]
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  end
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end
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run App
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