How can I override the encoding set in the HTTP header by the executed script using Apache 2?

Question

Apache HTTP Server

There is a script that sets its charset in HTTP headers. This charset is not suitable for our needs, the script sets UTF-8, the content is encoded in Windows-1251, I can’t recode the content - other services will fall off. The script is maintained by a third party (opensource). In order to avoid problems during further updates, I would like to leave the script as it is and change the header using Apache 2. Is it possible?
I tried AddDefaultCharset, but the script interrupts this parameter.

Answer 1

If you just change the title, it will not give you anything. The content will remain in UTF-8. There is only one way out - to recode the response from UTF-8 to Windows-1251, and then use it for your needs.
Then there are the following options:
1. For the necessary files in the Apache config, try to set:

Header set Content-Type "text/html; charset=Windows-1251"

2. Convert "on the fly" content to UTF-8 using:
httpd.apache.org/docs/2.2/mod/mod_charset_lite.html
3. Find and fix the jamb in the script, because this should not be, that the encoding is in the header one and the content in the other.

Answer 2

How do you imagine that? )
Apache web server that gives the code to the browser on the port.
Your code is executed on the user's computer.