# File lib/rack/chunked.rb, line 40
    def call(env)
      status, headers, body = @app.call(env)
      headers = HeaderHash.new(headers)

      if env['HTTP_VERSION'] == 'HTTP/1.0' ||
         STATUS_WITH_NO_ENTITY_BODY.include?(status) ||
         headers['Content-Length'] ||
         headers['Transfer-Encoding']
        [status, headers, body]
      else
        headers.delete('Content-Length')
        headers['Transfer-Encoding'] = 'chunked'
        [status, headers, Body.new(body)]
      end
    end