How to redirect pages with the same URI from a domain to a subdomain?

Question

htaccess

I've been fighting for a long time ..
how to set up a redirect?
site.ru/test/ on sub.site.ru/test/
Tried:
redirect 301 /test sub.site.ru/test
RewriteRule ^test/$ sub.site.ru/test [R=301,L]
Error appears:
The site sub.site.ru redirected too many times.

Answer 1

RewriteRule ^test/$ http://sub.site.ru/test [R=301,L]

Answer 2

I solved the problem by writing a plugin for the OnHandleRequest system event.
There I used a php redirect on condition that a certain page was loaded.
Just written