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# run this with : # rackup hello.ru app1 = Proc.new {|env| [200, {'Content-Type'=>'text/html', 'hello world!'] } class GoodBye def initialize(app) @app = app end def call(env) if env['PATH_INFO'] =~ %r{/goodbye} [200, {'Content-Type'=>'text/html'}, 'goodbye world!'] else @app.call(env) end end end use Goodbye run app1

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