>
> Can you check to make sure that your version of scgi_server has that
> line?  If it does, you've probably ran into a Python bug (or
> possibly an OS bug).
>
>

Neil,

Thank you so much!!  It's working now :)

Now I know what the problem was. SCGI is represented in FreeBSD ports
collection in two parts:
- mod_scgi:     "An Apache module that implements the client side of the
Simple Common Gateway Interface protocol."
- py-scgi:              "Python server implementation of the Simple Common
Gateway
Protocol"

Both ports are very out of date: version 0.02.
I've modified the mod_scgi port to get the latest version, but I did
not modified py-scgi... so the python files I used were very old.

Now it works perfectly!

Sorry for bothering,
Ksenia.