Removing single question mark?

[Dave Wreski <dwreski@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx>]

Hi,

I have another challenging rewrite rule request, please. I'm trying to remove a single question mark from a URL:

https://example.com/?

I've tried the following:

RewriteRule ^/\?$ / [L,R=301,QSD]
RewriteRule ^/\? /? [L,R=301]

RewriteCond %{REQUEST_URI} ^$
RewriteRule ^ /? [L,R=301,QSD]

But it seems to ignore all of them. Ideas greatly appreciated.

Thanks,
Dave