>
> One other idea I have had is could I setup an .htaccess rule that
> redirects to a universal empty PNG file for any tile that can’t be
> found (so it doesn’t return a bad request).

Thats what I do. In my experience its lighter weight than using a
custom handler (say php)

Use the rewrite engine to perform the redirect, rather than a
ErrorDocument, that has too much overhead.


RewriteEngine on
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule ^(.*)$ /img/transparent_1x1.png [L]

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