How to allow nginx to work on http and https?

Question

Nginx

Issue when loading third party content via iframe. I get a 'mixed content' error because I get data from http.
Is it possible to make the site work on https, but at the same time allow content to be loaded from an insecure protocol?
My conf:

server {
listen ip:443;
ssl on;
ssl_certificate/../cert.crt;
............
}

Answer 1

What about nginx? Embed links in HTML with https://or without a protocol //if the resource is available on both protocols.