Trail slash with multiple htaccess - .htaccess

Question

I have directory structure like this:
public_html
.htaccess[1]
-apps
-.htaccess[2]
-admin
-myviwo
when I request http://localhost/mysite/admin it redirect me to http://localhost/mysite/apps/admin/ and shows me the content of the admin directory, if I request http://localhost/mysite/admin/ it doesn't redirect me but it shows me the content of admin directory again which is correct. But I want:
http://localhost/mysite/admin
http://localhost/mysite/admin/
Both of the above URLs shows me the content of admin directory without redirecting me.
.htaccess [1]
RewriteEngine On
RewriteBase /
RewriteRule (.*) apps/$1 [L]
.htaccess [2]
RewriteEngine On
RewriteBase /
RewriteRule ^admin/?(.*)$ admin/$1 [L]
RewriteRule ^(.*)$ myviwo/$1 [L]
How can I achieve this?

Answer 1

In the admin directory, add an htaccess file with the following:
DirectorySlash Off
This makes it so mod_dir won't redirect requests for the directory admin. However, note that there's an important reason why directory slash is "on" by default:
Security Warning
Turning off the trailing slash redirect may result in an information disclosure. Consider a situation where mod_autoindex is active (Options +Indexes) and DirectoryIndex is set to a valid resource (say, index.html) and there's no other special handler defined for that URL. In this case a request with a trailing slash would show the index.html file. But a request without trailing slash would list the directory contents.
If that's ok with you, then that's all that you need.
Otherwise, you may need to add a special rule specifically for admin. In the .htaccess[1] file, add right below the rewrite base:
RewriteRule ^admin$ apps/admin/ [L]
EDIT: to make the above rule dynamic, you need to first check if it's a directory:
RewriteCond %{DOCUMENT_ROOT}/apps%{REQUEST_URI} -d
RewriteRule ^(.*[^/])$ apps/$1/ [L]