CodeIgniter 3 - 403 Forbidden on POST from jQuery.ajax() asynchronous request

Preset Apache mod_rewrite Flags modified RewriteRules causing AJAX requests to fail.The solution is either:

1. Deactivate mod_rewrite if you can on your hosting (not recommended)

2. Change .htaccess of codeigniter installation from:

Code:

RewriteEngine On
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule .* index.php/$0 [PT,L]
RewriteCond $1 !^(index\.php|images|robots\.txt)

to:

Code:

<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]
</IfModule>

$string = $this->load->view('return_view_as_data', '', TRUE);