Strange Webrick behavior on startup

I just noticed this happening lately. Every time I restart the Webrick server and load the first page, I get the following info at the bottom of my page:

HTTP/1.1 200 OK Cache-Control: no-cache Connection: Keep-Alive Date: Mon, 11 Sep 2006 19:03:41 GMT Content-Type: text/html; charset=UTF-8 Server: WEBrick/1.3.1 (Ruby/1.8.2/2004-12-25) Content-Length: 44024 Set-Cookie: _session_id=

It only does this on the first page and browsing the site afterwards it does not show that. Where is this coming from?

Best Regards,

Tamim