Removing trailing question mark with htaccess

Question

Can someone help me understand this code?

# Remove trailing ?
RewriteCond %{THE_REQUEST} ? HTTP [NC] 
RewriteRule .? /%{REQUEST_URI}? [R=301,L]

Answer 1

RewriteCond %{THE_REQUEST} ? HTTP [NC] 
RewriteRule .? ^%{REQUEST_URI}? [R=301,L]

Isn't going to work, because ? is a reserved character for regular expressions and you'd need to escape it along with the space. Try:

RewriteCond %{THE_REQUEST} \?\ HTTP [NC] 
RewriteRule ^/?(index\.cfm)? /? [R=301,L]

Additionally, you want this rule under your # remove trailing index.cfm rule, and not at the very bottom.