a modular Ruby webserver interface

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 require 'rack/body_proxy'

module Rack

class Head
  # Rack::Head returns an empty body for all HEAD requests. It leaves
  # all other requests unchanged.
  def initialize(app)
    @app = app
  end

  def call(env)
    status, headers, body = @app.call(env)

    if env[REQUEST_METHOD] == HEAD
      [
        status, headers, Rack::BodyProxy.new([]) do
          body.close if body.respond_to? :close
        end
      ]
    else
      [status, headers, body]
    end
  end
end

end