Here is the .htaccess solution :

chmod .htaccess files 644
chmod pl files 755

chmod ini files 755

………

This htaccess method could be used for any extension. 

Good luck.

We will modify our server configuration file .htaccess and will show you how to design your custom error page. 

First we will create errorpage.html file , you can use your html or css methods to do that. 

create file called errorpage.html in your server root or create file on your desktop and upload it to your server, then edit. 

Type this code in your errorpage.html file , we didn’t define headers and body standards, but you can do it ,  any design could be used.

<div style=”width:500px;margin:0 auto;background:#eee;border:2px solid green”>

<div style-”padding:2em;color:#333″>

<h1>Error Occured</h1>

<p>

You reached page that doesn’t exists ….  <input type=”button” value=”back” onclick=”history.go(-1)”>

</p>

</div>

</div>

Save your errorpage.html , upload tou the root directory. 

Open .htaccess file and type the code below : 

RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^.*$ /errorpage.html [L]

That’s it ! Save your .htaccess file , now go to any “not existing page” just type some mess in your browser url , you will see custom error file ! Congrats , now we know how  to deal with server errors manually. 

You can modify all possible server errors manually, here is solution :

ErrorDocument 400 /error/400.html
ErrorDocument 401 /error/401.html
ErrorDocument 403 /error/403.html
ErrorDocument 404 /error/404.html
ErrorDocument 500 /error/500.html

Good luck coder !