.htaccess - This webpage has a redirect loop - .htaccess

Question

I'm cleaning my URLs and everything looks fine but whenever I try to access any directory such as images etc then chrome shows that "This webpage has a redirect loop." However I want to protect directories inside public_html.
The .htaccess file is inside public_html
<ifModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*)$ index.php?/$1 [L]
RewriteRule ^(.+)/$ http://%{HTTP_HOST}/$1 [R=301,L]
</ifModule>
I want to protect images, css and javascript directories but want to allow access to the admin directory.
Thank in advance.

Answer 1

Change order of your rules and change your trailing slash removing rule:
<ifModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.+?)/$ $1 [R=301,L]
# block all directories except admin/
RewriteCond %{REQUEST_FILENAME} -d
RewriteRule !^admin(/|$) - [NC,F]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*)$ index.php?/$1 [L,QSA]
</ifModule>

Answer 2

You can use this remove all code and use this one
option index allow and disallow to be index directory like
This does the trick.
Options All -Indexes
or
IndexIgnore *
for more information please check below link
http://viralpatel.net/blogs/htaccess-directory-listing-enable-disable-allow-deny-prevent-htaccess-directory-listing/