Can't validate big files by direct input

Hello.

When I try to validate a large CSS File, I get this error:

"The requested URL could not be retrieved"

I'm pretty sure that's due to the file's size and not it's contents. If 
this is the case, the solution is simple: make the form use a POST 
instead o a GET, same way the XHTML validator does.
The strange thing is that I've being validating big files for a year or 
so, and never had problems...
I'd really appreciate if I got a reply from you.


Thanks for all your efforts.