Error with apache and mongrel_cluster

Hi, im using Apache 2 as a proxy balancer and a mongrel_cluster.
When I try to load a particular controller/action of my application, it
displays something like a HTTP header and, below that, it shows me the
generated html as plain text.
The header is:

HTTP/1.1 0 Connection: close
Date: Thu, 14 Jun 2007 16:47:56 GMT
Set-Cookie: _session_id=33633b0c3e7635b2c3596882ce584cf3; path=/
Status: fromplanillas
Cache-Control: no-cache
Server: Mongrel 1.0.1
Content-Type: text/html
Content-Length: 8683

The thing is, I get this error only through the proxy but when I go
directly to one of the mongrel servers, it works. Something is weird
about the status the header is showing me. It seems like my code it’s
modifying the header status from a normal 200 ok to a status

(…) If someone could help me, I’ll appreciate it. Thanks.