Rewritten URLs with parameter length > 255 don't work
Solution 1:
Do you think you are running into a limitation of the file system?
May be the max filename length is of 255 bytes and when apache or the mod_rewrite rule checks if the file exists an error is returned to apache by the operating system.
If you put some rule in your .htaccess file, It's too late to work around the problem. Apache will have already tried to stat the filename and thrown file system error '(36)File name too long', returning a 403 error.
Maybe you could change the URL pattern inside your app. to a max of 255 chars from slash to slash.
EDIT: look here for a detailed answer to this issue. I borrowed mine from there.
Solution 2:
There's a similar question about this limit here:
You may be running into a limitation of the underlying file system
I don't know if you're using REQUEST_FILENAME somewhere in you .htaccess configuration, so don't know if the provided solution is going to work.