Make a website compatible with Iframe

Help
1

Hello, I would like to make a website Iframe compatible even though it does not have it by default. I tested the following instructions but it didn’t work for me, Firefox gives me the error SSL_ERROR_INTERNAL_ERROR_ALERT and in HTTP the page is empty!

example.com {
  header >X-Frame-Options "ANY"
  reverse_proxy https://theporndb.net
}

Can you help me make this site Iframe compatible?

2

SSL_ERROR_INTERNAL_ERROR_ALERT has nothing to do with iframes. This is saying your browser failed to connect over TLS (HTTPS) to your server.

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