How to specify many Header set X-Frame-Options "ALLOW-FROM .." headers for IE11?

Question

HTTP headers

If you specify one header, access to the frame with the desired site is not blocked, if you specify a lot, apparently they are overwritten by each other.

Answer 1

You need to specify: always set X-Frame-Options
and domain. then there will be 2 headers

Answer 2

So that the title does not replace the one of the same name, Header setuse instead Header add(if necessary, the value is added to the existing one - Header append).