A lot of commonly used htaccess code snippets for use with the Apache Web Server.
Note 1: You may not need Options FollowSymlinks as it's commonly set by serverwide config file, already.
Note 2: You need RewriteEngine On only once in the .htaccess file.
<== No slash at the end.
Generally, you should ALWAYS put a slash after a directory name.
But some robots and links don't follow this practice, and you may want to use this fix.
In short, you only need this code if you use 'www.' for your domain name.
I prefer URL without 'www', these days, as it's shorter and easier.
Options +FollowSymlinks
RewriteEngine On
RewriteRule ^/*(.+/)?([^.]*[^/])$ http://%{HTTP_HOST}/$1$2/ [L,R=301]
#If you want to cover both http and https:
Options +FollowSymlinks
RewriteEngine On
RewriteCond s%{HTTPS} ^((s)on|s.*)$ [NC]
RewriteRule ^/*(.+/)?([^.]*[^/])$ http%2://%{HTTP_HOST}/$1$2/ [L,R=301]
#Note: These codes are very efficient compared to the code
#with '-d' check, but they won't work with directories that have a dot (period) in it.
# (ex. /a_directory.name/)
Options +FollowSymlinks
RewriteEngine On
RewriteCond %{HTTP_HOST} !^(www.|$) [NC]
RewriteRule ^ http://www.%{HTTP_HOST}%{REQUEST_URI} [L,R=301]
#If you want to cover both http and https:
Options +FollowSymlinks
RewriteEngine On
RewriteCond %{HTTP_HOST}//s%{HTTPS} ^([^.]{4,}|[^w.]?[^.][^w.]?[^.]?[^w.]?)..*//((s)on|s.*) [NC]
RewriteRule ^ http%3://www.%{HTTP_HOST}%{REQUEST_URI} [L,R=301]
It may look complicated, but this code reduce the wasteful redirect to your site.
Options +FollowSymlinks
RewriteEngine On
RewriteCond %{REQUEST_URI}/%{HTTP_HOST}/www. ^/+(.+/)?[^.]*[^/](/)(([^.]{4,}|[^w.]?[^.][^w.]?[^.]?[^w.]?)..+/(www.)|.*)$ [OR,NC]
RewriteCond %{HTTP_HOST}/www. ^(/)?(#)?(/)?(([^.]{4,}|[^w.]?[^.][^w.]?[^.]?[^w.]?)..+/(www.))$ [NC]
RewriteRule ^ http://%6%{HTTP_HOST}%{REQUEST_URI}%2 [L,R=301]
#If you want to cover both http and https:
Options +FollowSymlinks
RewriteEngine On
RewriteCond %{REQUEST_URI}/%{HTTP_HOST}/www.//s%{HTTPS}
^/+(.+/)?[^.]*[^/](/)(([^.]{4,}|[^w.]?[^.][^w.]?[^.]?[^w.]?)..+/(www.)|.*)//((s)on|s.*)$ [OR,NC]
RewriteCond %{HTTP_HOST}/www.//s%{HTTPS}
^(/)?(/)?(([^.]{4,}|[^w.]?[^.][^w.]?[^.]?[^w.]?)..+/(www.))//((s)on|s.*)$ [NC]
RewriteRule ^ http%7://%5%{HTTP_HOST}%{REQUEST_URI}%2 [L,R=301]
Options +FollowSymlinks
RewriteEngine On
RewriteCond %{HTTP_HOST} ^www.(.*)$ [NC] RewriteRule ^ http://%1%{REQUEST_URI} [L,R=301]
#If you want to cover both http and https:
Options +FollowSymlinks
RewriteEngine On
RewriteCond %{HTTP_HOST}//s%{HTTPS} ^www.(.*)//((s)on|s.*)$ [NC]
RewriteRule ^ http%3://%1%{REQUEST_URI} [L,R=301]