How to convert all requests to https in nginx?

Question

Nginx

There is a forum, nginx - frontend, apache2 - backend.
https is configured, and problems arise when users add images from third-party sources - the browser swears at mixed content, and puts an exclamation mark next to the padlock.
Question: is it possible to configure nginx in such a way that all http connections are proxied and issued to the client via https?

Answer 1

In general, the solution is banal, using sub_filter to change all links to https.

Answer 2

is it possible to configure nginx in such a way that all http connections are proxied and issued to the client via https?

Image requests from third-party sources do not reach your site, so no, proxying only using nginx will not work. You need to replace all links to external images with your handler, which will already handle proxying.