I'm using Laravel 8 on Heroku and keep getting 404 errors for some fonts. This just started happening earlier today but I haven't changed any of my code in several days.
This is a sample of what I'm seeing from laravel's error handler:
404 - https://www.example.com/%7B%7BEXTENSION_BASE_URL%7D%7D/b06871f281fee6b241d60582ae9369b9.ttf
404 - https://www.example.com/%7B%7BEXTENSION_BASE_URL%7D%7D/fee66e712a8a08eef5805a46892932ad.woff
404 - https://www.example.com/%7B%7BEXTENSION_BASE_URL%7D%7D/af7ae505a9eed503f8b8e6982036873e.woff2
I searched my entire directory for EXTENSION_BASE_URL and it doesn't exist anywhere in my code.
The user id's associated with these errors are not unique and it seems to be happening to multiple people. It's the same three font files as above each time.
My best guess is there's some kind of plugin people have installed that's trying to use a custom font that doesn't exist. I can't find any reference to EXTENSION_BASE_URL when I do searches online, so I can't figure out where it's actually coming from.
The only custom fonts I use are an import for Raleway from the Google Fonts API. I have jQuery 2.2.4, Bootstrap 3.3.7 and FontAwesome 5.4.1 which might also be including fonts with their CSS. Aside from the Raleway include, the versions for the other CSS files haven't changed in a while.
Since it doesn't seem to be affecting everyone and I can't track down what these font files are, my plan is to simply exclude these font files from showing up in my logs. I'd love to know what caused this though so I can take any other action if necessary