I'm looking for a way to remove trailing slash for all WordPress URL's.

I found similar answers like this one but it doesn't work when there's WordPress .htaccess rules before.

Here is my current WordPress .htaccess:

# BEGIN WordPress
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteRule ^index\.php$ - [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
</IfModule>

# END WordPress

Try this:

# BEGIN WordPress
<IfModule mod_rewrite.c>
    RewriteEngine On
    RewriteBase /
    RewriteRule ^index\.php$ - [L]

    RewriteRule (.+)/$ $1 [R=301,L]

    RewriteCond %{REQUEST_FILENAME} !-f
    RewriteCond %{REQUEST_FILENAME} !-d
    RewriteRule . /index.php [L]
</IfModule>

If it doesn't work try this one:

# BEGIN WordPress
<IfModule mod_rewrite.c>
    RewriteEngine On
    RewriteBase /
    RewriteRule ^index\.php$ - [L]

    RewriteRule (.+)/$ http://www.domain.com/$1 [R=301,L]

    RewriteCond %{REQUEST_FILENAME} !-f
    RewriteCond %{REQUEST_FILENAME} !-d
    RewriteRule . /index.php [L]
</IfModule>

It might be as simple as go to settings > permalinks in the wp admin and remove the trailing slash at the input box for custom structure

Here are the steps to remove trailing slashes site-wide. If you simply wish to remove the trailing slashes on posts only, skip to Step 2.

Important Things To Consider

In .htaccess, the code between lines # BEGIN WordPress & # END WordPress may get reset by WordPress. Avoid changing code between those lines.
Forcing removal of trailing slashes, causes a loop in example.com/wp-admin. You can avoid the issue by excluding directories RewriteCond %{REQUEST_FILENAME} !-d.

The following solution addresses those issues.

Step 1 - Update /.htaccess file

Add the following code before the # BEGIN WordPress line in your /.htaccess file. This redirects URLs with trailing slashes to URLs with no trailing slashes.

# Remove trailing slashes
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /

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

</IfModule>

Step 2 - Update Permalinks

As others have pointed out, you must also update your Permalinks (Settings -> Permalinks) to Custom Structure, and remove the trailing slash there. It removes the trailing slash on all your posts.

To solve this trailing slash in WordPress URL problem, log in to your website admin panel -> go to Setting Tab -> click on Permalinks under Settings. It will open a page something like the below screen:

Now, check to verify the setting you have opted for the website URL structure. Make sure that you are not leaving a trailing slash in the URL structure. https://blog.techblogsearch.com/2018/11/29/guide-to-remove-trailing-slash-from-wordpress-url

来源：https://stackoverflow.com/questions/8558234/remove-trailing-slash-using-htaccess-in-wordpress

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