[Nitro] what does compiling action mean?

[Dan Yoder]

now i have this very simple hello world controller, with only an index 
method returning hello world, and i am getting this apparently infinite 
loop:

DEBUG: Rendering '/'.
DEBUG: Compiling action 'public/index'
127.0.0.1 - - [22/Mar/2005:02:45:07 CST] "GET / HTTP/1.1" 303 32
- -> /
DEBUG: Rendering '/'.
DEBUG: Compiling action 'public/index'
127.0.0.1 - - [22/Mar/2005:02:45:07 CST] "GET / HTTP/1.1" 303 32
- -> /
DEBUG: Rendering '/'.
DEBUG: Compiling action 'public/index'
127.0.0.1 - - [22/Mar/2005:02:45:07 CST] "GET / HTTP/1.1" 303 0
- -> /