The following JS script no longer exists on my server. (Please remove the space - I don’t want to link to it directly.)
https://www.intmath.com/ [SPACES HERE] includes/cssjs/katex/katex.minjs-2017-11-14.js
It’s reported as a “Soft 404” in Google Webmasters, and in SEOBook’s http://tools.seobook.com/server-header-checker/ it’s returning a 200.
The message I get is
It should be returning a 404.
I tried a Custom Purge of the URL, but it had no effect. How can I address this?