response.headers without "x-runtime"?

rails:1.2.6

curl -I http://localhost:4000/ HTTP/1.1 200 OK Connection: close Set-Cookie: _co56_web_session_id=cd290031eadc2ac55593098aee726985; path=/ Status: 200 OK X-Runtime: 10 Cache-Control: no-cache Server: Mongrel 1.1.4 Content-Type: text/html; charset=utf-8 Content-Length: 18292