proxy subdomains

Hi, Is it possible to proxy a site to a second domain on the same host? I tried the method through mod_rewrite, but it doesn't work because the links are not replaced in the displayed content. How to do it? I want to display this content https://shop-station.ml/blog/ under the link...

hello i get error 503 when i want to load proxy subdomains like http://cpanel.domain.com. also i checked apache and there isn't any problem when switch to apache... i attached screenshot of this error that captured from lsws log console. also some errors like this happened when i got 503...