Probable issue with connecting to apache2.2/fastcgi/mpm-prefork

The server says: [error] [client x.x.x.x] chunked Transfer-Encoding forbidden: [url]

I have read it is a feature of apache to not allow chunked content encoding intially, to prevent sending endless requests to make a Denial of Service attack.
Solution would be to first set up te connection and then when connected, send the chunked content encoding header, but I have not got the knowledge to say this for sure.

I works on the default apache2 installation though. If this is not a client-side problem, might it be possible to create an option to disable chunked transfer encoding without ill-effects?