When accessing a remote file on a common share wiki, with sutation that send phrase request directly to that wiki is not possible, guessing url is used.

Apache/Nginx redirect were set on the remote wiki, and the first non-exist thumb request will be handle well.

However, the first request will return a 404 response and it will get cached by CDN, which made all the rest visitor can't view that image thumb anymore. How to config the thumb.php work around to get it not to return 404? If this is not possible, then how can I avoid caching 404 by CDN when using MultimediaViewer?

wgMediaViewerUseThumbnailGuessing = true;

RewriteEngine on
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule ^/?w/images/thumb/[0-9a-f]/[0-9a-f][0-9a-f]/[^/]+/[^/]+$ /w/thumb_handler.php [L,QSA]