How to avoid the asset path warming

Rails
#1

Started GET “/assets/products.css?body=1” for 127.0.0.1 at 2011-10-12
16:46:52 +0800
Served asset /products.css - 304 Not Modified (0ms)

Started GET “/assets/users.js?body=1” for 127.0.0.1 at 2011-10-12
16:46:52 +0800
Served asset /users.js - 304 Not Modified (0ms)

Started GET “/assets/application.js?body=1” for 127.0.0.1 at 2011-10-12
16:46:52 +0800
Served asset /application.js - 304 Not Modified (1ms)

Started GET “/assets/logo.jpg” for 127.0.0.1 at 2011-10-12 16:46:53
+0800
Served asset /logo.jpg - 304 Not Modified (0ms)

The server outputs infomation like these.
Exactly those images are in path /assets/images, while js in
/assets/javascripts, css in /assets/stylesheets. Also the browser has
loaded them correctly. I guessed that Rails has mapped them in the path
/assets since I can open the css and js in the page source. But how can
i avoid those infomation in the server?

#2

Those are not warnings at all. Just normal log messages.

Your browser is requesting the js, css, and jpg files with a conditional
GET. The server is returning HTTP status code 304 since the file has not
been modified since the last time the browser accessed. This is just a
log
of that transaction.

See here for more info on HTTP 304:
http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html#sec10.3.5