Htaccess file - 404 page not found on some folders - .htaccess

Question

I am using codeigniter and I keep having these 404 errors in my log file.
ERROR - 2016-04-30 16:41:15 --> 404 Page Not Found: Assets/js
ERROR - 2016-04-30 16:41:15 --> 404 Page Not Found: Assets/js
ERROR - 2016-04-30 16:41:18 --> 404 Page Not Found: Assets/js
So every page load causes one entry of the above error in the log file. My htaccess file looks like below. What's going wrong here?
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteCond %{REQUEST_URI} ^system.*
RewriteRule ^(.*)$ index.php?/$1 [L]
RewriteCond %{REQUEST_URI} ^application.*
RewriteRule ^(.*)$ index.php?/$1 [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*)$ index.php?/$1 [L]
RewriteCond $1 !^(index\.php|assets|myadmin|robots\.txt)
RewriteRule ^(.*)$ index.php?/$1 [L]
</IfModule>
<IfModule !mod_rewrite.c>
ErrorDocument 404 /index.php
</IfModule>
I can confirm assets/js are valid folders.

Answer 1

Are you able to get to your assets folder by going through the web path? e.g. http://localhost/assets (try to retrieve a file if you dont have indexing enabled in your webserver e.g. http://localhost/assets/css/style.css), does it load?
If this is loading you are possibly calling your assets without using a base path which means a view is trying to call directly from within its own folder.
Using site_url() is a really good step (url helper)... I urge you to make your life easier in calling assets by making a simple helper and adding it to auto load containing (something like) this:
if (!function_exists('assets'))
{
/**
* Base asset directory call
*/
function assets($var)
{
$CI =& get_instance();
$CI->load->helper('url');
return site_url('assets') . '/' . $var;
}
}
You would then call it in your view:
<!-- load CSS -->
<link href="<?php echo assets("css/bootstrap.min.css") ?>" rel="stylesheet">
It would then show this once rendered:
<link href="http://localhost/assets/css/bootstrap.min.css" rel="stylesheet">
This is just a really basic example though, if you have heaps of assets to call in a header or footer, I would suggest creating a helper to load based on a config file, you can also specify what is required on certain page loads that way as well so its dynamically loaded with a foreach.
Also do be careful calling Assets (capital letter) vs assets (no capital letter) is very different, many webservers are case-sensitive...
I run the following for my htaccess file:
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteCond $1 !^(index\.php|assets|robots\.txt|favicon\.ico)
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*)$ index.php/$1 [L]
</IfModule>