# File lib/ramaze/response.rb, line 54
    def body=(obj)
      if obj.respond_to?(:stat)
        @length = obj.stat.size
        @body   = obj
      elsif obj.respond_to?(:size)
        @body   = []
        @length = 0
        write(obj)
      else
        raise(ArgumentError, "Invalid body: %p" % obj)
      end
    end