the website at http://graphite.khanacademy.org/ isn't configured correctly.
It displays the lighttpd version as well the directory contents. You should disable these features in your lighttpd.conf / php.ini.
``` Index of /
Name Last Modified Size Type Parent Directory/ - Directory index.lighttpd.html 2012-Jun-12 02:46:34 3.4K text/html lighttpd/1.4.28 ```
Yours sincerely, Sebastian Neef