each

# File actionpack/lib/action_dispatch/http/response.rb, line 149
    def each(&callback)
      if @body.respond_to?(:call)
        @writer = lambda { |x| callback.call(x) }
        @body.call(self, self)
      else
        @body.each { |part| callback.call(part.to_s) }
      end

      @writer = callback
      @block.call(self) if @block
    end