404 errors on static files ( WPEngine )

I’m assuming the static files you mention are Autoptimized CSS/ JS files? Can you test if the fallbacks work by taking the URL of an Autoptimized JS-file and changing one number/ letter in the hash (the random part of the filename), it should redirect to autoptimize_fallback.js?

frank

Static files I meant are indeed the Autoptimize generated files! The fallbacks aren’t working:

I tried checking a CSS file autoptimize_164ccbfc71db096c97870abc99e0edd8.css – tried changing a letter or number near the end of the string, returns 404.

You’ll need to ask WPEngine to either:
* have 404’s handled by WordPress
* OR ensure 404’s for wp-content/cache/autoptimize/ get redirected to /wp-content/autoptimize_404_handler.php, see example nginx configuration below

location ~* /wp-content/cache/autoptimize/.*\.(js|css)$ {
    try_files $uri $uri/ /wp-content/autoptimize_404_handler.php;
}

Thank you for the tip! WPEngine has added the code but now testing to see the filename change – I get a 410 error – I’ve enabled the error logging with the filter you have to monitor this!

410 is when the fallback-handler does not find the fallback-file (wp-content/cache/autoptimize/js/autoptimize_fallback.js), can you check if that exists?

additionally; 404 fallback only works when you’re serving the AO files as static files, this option is on by default but maybe you changed it?

The autoptimize_fallback.js does exist and it’s accessible directly, but the 410 still exists.

And yeah, I have all but the last one ( shop cart/checkout ) options enabled at the Misc Options. ( I think that’s the default setup? )

no idea I’m afraid .. can you share your site’s URL?

Could I share it privately? I replicated the issue in another environment with same Autoptimize settings but without random 404 errors at the moment ( it was the same nginx rules you suggested ) – So it could be a WPEngine wide issue for the 404 fallback?

PS: I have Frank’s email from an old conversation

yes, it could be WP Engine wide; the basic issue is that normally WordPress handles 404’s, which AO hooks into. feel free to mail me ??

frank

hey grnetfreak ; I’m not sure if I ever received your mail (maybe I did and I forgot)? ??

No feedback so I assume this got resolved? Feel free to follow up if you still encounter issues!

have a nice day!
frank