# File lib/rack/head.rb, line 12
  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