gistfile1.rb

module Rack
  class InputEncoder
    def initialize app 
      @app = app 
    end 
    def call env 
      env["rack.input"] = IO.new(env["rack.input"])
      @app.call(env)
    end 
    class IO < DelegateClass(IO)
      def initialize io
        @io = io
        super(@io)
      end 
      def read *args
        @io.read(*args).force_encoding(Encoding.default_internal)
      end 
    end 
  end 
end