G'day!

I've no problem customizing the error message for HTTP errors 404 or 403, but failed to customize error 400

I added the following line to .htaccess
ErrorDocument 400 /400.txt

Then issued the following commands:

telnet www.xxxx.com 80
GET /hello world HTTP/1.1
Host: www.xxxx.com


The original Apache Error 400 message appearred.

What version of apache are you using?

are you getting an additional 404 error along with the 400?