find failed config in shared host server

[hp2]

In the /var/log/httpd/error_log, I get errors like this

2024-01-05 15:28:08.550639 [ERROR] [935383] [(null)] rewrite: unknown server variable while parsing: RewriteRule ^ %{REQUEST_SCHEME}://%1%{REQUEST_URI} [R=301,L]

I guess it's coming from an account on the server, but I don't know which one.
Searching that error in /var/log/httpd/domains/ didn't give me any result.
Searching "RewriteRule ^ %{REQUEST_SCHEME}" in /usr/local/directadmin/data/users/ didn't give me any result either.

Where should I check and find out the error comes from, please?
Thanks.

 

[Cold-Egg]

What if you filter 'REQUEST_SCHEME' only to the /usr/local/directadmin/data/users/*

 

[hp2]

No result either

[root@server-name users]# find . | xargs grep -s "REQUEST_SCHEME"
[root@server-name users]#