The site does not work on SSL + H2, it works without H2. What could be the problem?

Question

Nginx

There is a site with a configured secure connection. It only works if disabled in nginx http2 settings. If we turn it on, then the site issues "Unable to establish a connection to the site."
Apache and nginx error logs are empty.

Site with http2 disabled:

With enabled

Answer 1

If you open, for example, such a url: https://spaa-team.ru/page , then everything is OK - the page, although 404, is served via http2. The problem is not in Nginx, but in the back, apparently somewhere in the code there are manipulations with headers, for example Content-Length

Answer 2

I did not find a solution with the Apache + Nginx config. I installed Nginx on the server (Without Apache), h2 works correctly with it, there are no problems