How to find all resources on the site that are loaded without SSL?

Question

Digital certificates

There is a site with more than 10 thousand pages, it works via HTTPS
But on some pages there may be inserts from third-party resources of pictures and javascript via HTTP . Also, there may be third-party javascript inserts on the site via HTTPS , but when the browser is opened, they, in turn, are executed and load additional resources via HTTP

TASK
Regularly check the site and find such pages

DESIRED SOLUTION
Found a similar SSL verification service that does this online (the last one at the bottom check point). But the check is limited to only 20 pages.

Is there something similar open source, so as not to write your bike?
Or how else can you solve the problem?

Answer 1

Or how else can you solve the problem?

Create your own resource download listener in JS and paste it on all pages.
As soon as the HTTP protocol is detected, pull your apish.