Laravel public/subfolder another source code

anybody know how to let laravel some route to another folder inside laravel public folder, current folder structure:

public
   index.php <==== this is laravel index.php
   .htaccess <==== this is laravel default .htaccess
   subfolder <==== this is not laravel php code files

in my localhost, i can visit the subfolder with url http://ift.tt/2eLMhtb

but in my live site, http://ift.tt/1gosCeT throw me error of

NotFoundHttpException in RouteCollection.php line 161:

here is the laravel .htaccess files

<IfModule mod_rewrite.c>
    <IfModule mod_negotiation.c>
        Options -MultiViews
    </IfModule>

    RewriteEngine On

    # Redirect Trailing Slashes If Not A Folder...
    RewriteCond %{REQUEST_FILENAME} !-d
    RewriteRule ^(.*)/$ /$1 [L,R=301]

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

both local/live server source code are sync, i guess this is some server settings issues but i dont know what is the keyword, appreciate for all the help

btw, laravel 5.2 version

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