# File lib/thin/async.rb, line 50
    def initialize(env, status=200, headers={})
      @callback = env['async.callback']
      @close = env['async.close']
      @body = DeferrableBody.new
      @status = status
      @headers = headers
      @headers_sent = false
      @done = false

      if block_given?
        yield self
      end
    end