How to configure Apache to not use chunked transfer encoding?

[Lasse Koskela]

I need to set up a proxy (iPlanet) in front of an Apache+Tomcat server. It's all fine and dandy except that for some pages, the iPlanet proxy plugin appends an NSAPI error message after the actual HTML page. Apparently it's because the response coming from Apache uses "chunked" transfer encoding and iPlanet's proxy plugin doesn't support it.

So, my question is how to prevent Apache from using chunked transfer encoding?
I tried to Google and browse the Apache docs but to no avail.