content-type: text/html; charset=windows-1251

Hi,

Consider please a problem where charset gets windows-1251 after I enable caching.

The below did not help.
I gor Internal Server Error (500) and usage of simple “AddDefaultCharset UTF-8” did not have any effect.
Utf-8 Character Encoding Problem
https://www.wpfastestcache.com/tutorial/utf-8-character-encoding-problem/

Snapshot of the problem:
https://www.dropbox.com/s/o4k5vktieh53fwf/FastestCache_charset_windows1251_problem.jpg?dl=0