FastCGI protocol debugging?

Hi all,

I have just implemented the FastCGI protocol in my webserver (Das
Schaefchen :-) ) and
installed php for testing (php-cgi)... and of course it doesn't
work ;-). I send the request to
the FastCGI server but it closes the connection (RST).

Is there some way to make PHP write to stdout the requests it receives
and what's wrong
with them? I have tried with lighttpd and it works when I make
requests to the same port
(I just wanted to make sure that php was well configured).

Thanks in advance,

Guido.