404 errors on /a folders in Webmaster Tools

Question

In Google Webmaster Tools, under crawling errors, my number one 404 error is something called

www.domain.com/a 

There is no such thing in m

Answer 1

Check your Apache error logs. Or install a small PHP file which saves the $_SERVER["HTTP_REFERER"] like:

Then create a .htaccess file to redirect calls to /a to this PHP:

Options FollowSymLinks
RewriteEngine On
RewriteRule ^a$ somthing.php

Alternatively you can save your PHP on the name /a/index.php, that way you do not need redirect.