[php] Htaccess: add/remove trailing slash from URL

My website runs a script called -> WSS wallpaper script

My Problem -> I have been trying to force remove or add trailing slash to the end of my URL to prevent duplicated content and also to clean up my URLs.

I have tried all sorts and tried everything I could think of and loads from the interwebs but no such luck yet! It might be a quick fix but I have looked at it so much I am probably blind to something dead obvious.

So I present you with all my .htaccess code:

DirectoryIndex index.php

RewriteEngine on
RewriteRule ^download/([0-9]+)?/([0-9]+)x([0-9]+)/([^/\.]+) image.php?id=$1&width=$2&height=$3&cropratio=$4&download=1 [L]
RewriteRule ^file/([0-9]+)?/([0-9]+)x([0-9]+)/([^/\.]+) image.php?id=$1&width=$2&height=$3&cropratio=$4 [L]
RewriteRule ^preview/([0-9]+)?/([0-9]+)x([0-9]+)/([^/\.]+) wallpaper_preview.php?id=$1&width=$2&height=$3&name=$4 [L]
RewriteRule ^thumbnail/([0-9]+)?/([0-9]+)x([0-9]+)/([^/\.]+)/([^/\.]+)/([^/\.]+)/([^/]+) image.php?wallpaper_id=$1&width=$2&height=$3&cropratio=$4&align=$5&valign=$6&file=$7 [L]
RewriteRule ^cat/([0-9]+)?/([^/\.]+)/p([0-9]+) index.php?task=category&id=$1&name=$2&page=$3 [L]
RewriteRule ^cat/([0-9]+)?/([^/\.]+)/([0-9a-zA-Z?-]+)/p([0-9]+) index.php?task=category&id=$1&name=$2&sortby=$3&page=$4 [L]
RewriteRule ^cat/([0-9]+)?/([^/\.]+)/([0-9a-zA-Z?-]+)-([0-9]+) index.php?task=category&id=$1&sortby=$3&page=$4 [L]
RewriteRule ^cat/([0-9]+)?/([^/\.]+) index.php?task=category&id=$1&name=$2 [L]
RewriteRule ^tag/([^/\.]+)/([0-9a-zA-Z?-]+)/([0-9]+) index.php?task=tag&t=$1&sortby=$2&page=$3 [L]
RewriteRule ^tag/([^/\.]+) index.php?task=tag&t=$1 [L]
RewriteRule ^profile/([0-9]+)?/([^/\.]+) index.php?task=profile&id=$1&name=$2 [L]
RewriteRule ^profile/comments/([0-9]+)?/([^/\.]+) index.php?task=users_comments&id=$1&name=$2 [L]
RewriteRule ^page/([0-9]+) index.php?task=view_page&id=$1 [L]  
RewriteRule ^register index.php?task=register [L] 
RewriteRule ^lost-password index.php?task=lost_pass [L] 
RewriteRule ^links index.php?task=links [L]
RewriteRule ^news/item/([0-9]+)/([^/\.]+) index.php?task=news&id=$1 [L]
RewriteRule ^news/page([0-9]+) index.php?task=news&page=$1 [L]
RewriteRule ^members/([^/\.]+)-([^/\.]+)/page([0-9]+)? index.php?task=member_list&sort=$1&order=$2&page=$3 [L]
RewriteRule ^members index.php?task=member_list [L]
RewriteRule ^messages index.php?task=messages [L]
RewriteRule ^submit index.php?task=submit [L]
RewriteRule ^search/([^/\.]+) index.php?task=search&q=$1 [L]
RewriteRule ^search index.php?task=search [L]
RewriteRule ^submit index.php?task=submit [L]
RewriteRule ^r-([0-9]+)?-([0-9]+)? go.php?id=$1&ref=$2 [L]
RewriteRule ^r-([0-9]+)? go.php?id=$1 [L]
RewriteRule ^([^/\.]+)/([0-9]+)/([^/\.]+) index.php?task=view&id=$2&name=$3 [L]
RewriteRule ^news/([^/\.]+) index.php?task=news&name=$1 [L]
RewriteRule ^profile/([^/\.]+) index.php?task=profile&name=$1 [L]
RewriteRule ^news index.php?task=news [L]
RewriteRule ^page/([^/\.]+) index.php?task=view_page&name=$1 [L]  
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^([^/\.]+)/([0-9a-zA-Z'?-]+)/([0-9]+) index.php?task=category&name=$1&sortby=$2&page=$3 [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^([^/\.]+)/([^/\.]+) index.php?task=view&name=$2 [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^([^/\.]+) index.php?task=category&name=$1 [L]

## www reslove ##
RewriteCond %{HTTP_HOST} !^www\.
RewriteRule ^(.*)$ http://www.%{HTTP_HOST}/$1 [R=301,L]
## www reslove ##

## index reslove ##
Options +FollowSymLinks
RewriteCond %{THE_REQUEST} ^.*/index\.php
RewriteRule ^(.*)index.php$ http://www.epicwallpaper.net/$1 [R=301,L]
## index reslove ##

This question is related to php apache .htaccess mod-rewrite

The answer is

Right below the RewriteEngine On line, add:

RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*)/$ /$1 [L,R] # <- for test, for prod use [L,R=301]

to enforce a no-trailing-slash policy.

To enforce a trailing-slash policy:

RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule ^(.*[^/])$ /$1/ [L,R] # <- for test, for prod use [L,R=301]

EDIT: commented the R=301 parts because, as explained in a comment:

Be careful with that R=301! Having it there makes many browsers cache the .htaccess-file indefinitely: It somehow becomes irreversible if you can't clear the browser-cache on all machines that opened it. When testing, better go with simple R or R=302

After you've completed your tests, you can use R=301.

To complement Jon Lin's answer, here is a no-trailing-slash technique that also works if the website is located in a directory (like example.org/blog/):

RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_URI} (.+)/$
RewriteRule ^ %1 [R=301,L]

For the sake of completeness, here is an alternative emphasizing that REQUEST_URI starts with a slash (at least in .htaccess files):

RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_URI} /(.*)/$
RewriteRule ^ /%1 [R=301,L] <-- added slash here too, don't forget it

Just don't use %{REQUEST_URI} (.*)/$. Because in the root directory REQUEST_URI equals /, the leading slash, and it would be misinterpreted as a trailing slash.

If you are interested in more reading:

(update: this technique is now implemented in Laravel 5.5)

This is what I've used for my latest app.

# redirect the main page to landing
##RedirectMatch 302 ^/$ /landing

# remove php ext from url
# https://stackoverflow.com/questions/4026021/remove-php-extension-with-htaccess
RewriteEngine on 

# File exists but has a trailing slash
# https://stackoverflow.com/questions/21417263/htaccess-add-remove-trailing-slash-from-url
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^/?(.*)/+$ /$1 [R=302,L,QSA]

# ok. It will still find the file but relative assets won't load
# e.g. page: /landing/  -> assets/js/main.js/main
# that's we have the rules above.
RewriteCond %{REQUEST_FILENAME} !\.php
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_FILENAME}\.php -f 
RewriteRule ^/?(.*?)/?$ $1.php

Options +FollowSymLinks
RewriteEngine On
RewriteBase /
## hide .html extension
# To externally redirect /dir/foo.html to /dir/foo
RewriteCond %{THE_REQUEST} ^[A-Z]{3,}\s([^.]+).html
RewriteRule ^ %1 [R=301,L]

RewriteCond %{THE_REQUEST} ^[A-Z]{3,}\s([^.]+)/\s
RewriteRule ^ %1 [R=301,L]

## To internally redirect /dir/foo to /dir/foo.html
RewriteCond %{REQUEST_FILENAME}.html -f
RewriteRule ^([^\.]+)$ $1.html [L]

<Files ~"^.*\.([Hh][Tt][Aa])">
order allow,deny
deny from all
satisfy all

This removes html code or php if you supplement it. Allows you to add trailing slash and it come up as well as the url without the trailing slash all bypassing the 404 code. Plus a little added security.

Examples related to php

I am receiving warning in Facebook Application using PHP SDK Pass PDO prepared statement to variables Parse error: syntax error, unexpected [ Preg_match backtrack error Removing "http://" from a string How do I hide the PHP explode delimiter from submitted form results? Problems with installation of Google App Engine SDK for php in OS X Laravel 4 with Sentry 2 add user to a group on Registration php & mysql query not echoing in html with tags? How do I show a message in the foreach loop?

Examples related to apache

Enable PHP Apache2 Switch php versions on commandline ubuntu 16.04 Laravel: PDOException: could not find driver How to deploy a React App on Apache web server Apache POI error loading XSSFWorkbook class How to enable directory listing in apache web server Job for httpd.service failed because the control process exited with error code. See "systemctl status httpd.service" and "journalctl -xe" for details How to enable php7 module in apache? java.lang.RuntimeException: Unable to instantiate org.apache.hadoop.hive.ql.metadata.SessionHiveMetaStoreClient The program can't start because api-ms-win-crt-runtime-l1-1-0.dll is missing while starting Apache server on my computer

Examples related to .htaccess

Use .htaccess to redirect HTTP to HTTPs Getting a 500 Internal Server Error on Laravel 5+ Ubuntu 14.04 Server unable to read htaccess file, denying access to be safe Laravel 5 – Remove Public from URL Laravel 5 not finding css files How can I fix the 'Missing Cross-Origin Resource Sharing (CORS) Response Header' webfont issue? How Can I Remove “public/index.php” in the URL Generated Laravel? Apache 2.4 - Request exceeded the limit of 10 internal redirects due to probable configuration error Forbidden You don't have permission to access / on this server Htaccess: add/remove trailing slash from URL

Examples related to mod-rewrite

Getting a 500 Internal Server Error on Laravel 5+ Ubuntu 14.04 Forbidden You don't have permission to access / on this server Htaccess: add/remove trailing slash from URL Permission denied: /var/www/abc/.htaccess pcfg_openfile: unable to check htaccess file, ensure it is readable? 404 Not Found The requested URL was not found on this server Redirect all to index.php using htaccess .htaccess not working on localhost with XAMPP URL rewriting with PHP No input file specified htaccess redirect to https://www