On your reverse proxy configuration, make sure accept all encoding:
Example:
location / {
proxy_pass http://backend-server;
proxy_set_header Accept-Encoding “”;
proxy_set_header Host backend-server.tld;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header X-Forwarded-Proto $scheme;
proxy_redirect off;
sub_filter “<title>” “<title>Judul “;
sub_filter_types *;
sub_filter_once off;
}