Support that you need to redirect all URL from https to http except one URL

Its very simple you just have to add below line above the redirection code


RewriteRule  ^foldername/  -  [L]


Then all the url except the foldername will be redirected from https to http

RewriteRule ^foldername/ - [L]
RewriteCond %{SERVER_PORT} ^443$
RewriteRule ^(.*)$$1 [R=301,L]


Here all the URLs except will be redirected to http