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

1) Case 1: removing question mark

http://example.com/page/subpage/?YOURSTRING=blabla

to redirect to

http://example.com/page/subpage/

then in the beggining of .htaccess, insert:

RewriteEngine On
RewriteCond %{QUERY_STRING} YOURSTRING=(.*)
RewriteRule ^(.*)$ /$1? [R=301,L]


# if wordpres isnot installed in root folder, then edit the fourth line to this
# RewriteRule ^(.*)$ /YOUR-WORDPRESS-DIRECTORY/$1? [R=301,L]

2) Case 2: redirection from question mark to another link

http://example.com/index.php?YOURSTRING=blabla&id=44

to redirect to

http://example.com/page/subpage/

Use:

RewriteEngine On
RewriteCond %{QUERY_STRING} YOURSTRING=blabla&id=44
RewriteRule ^(.*)$ http://example.com/page/subpage/? [R=301,L]