Ngnix mask subdomain to URL from another subdomain with parameters - nginx

Question

Is it possible to mask a sub-domain to point to another sub-domain like so:
sub.domain.comto sub2.domain.com/example/example2.
I was able to sort of get this by using this nginx configuration:
server {
listen 443 ssl http2; # managed by Certbot
<!-- ssl_certificate goes here -->
server_name sub.domain.com;
rewrite ^/?$ https://sub2.domain.com/example/example2 permanent;
}
But the problem with this config is that when you go to sub.domain.com you are redirected to sub2.domain.com/example/example2 instead of just masking the URL.
And if I go to sub.domain.com/test instead of going to sub2.domain.com/example/example2/test it just shows 404 page.

Answer 1

Finally! I figured it out myself.
Instead of rewrite I had to use proxy_pass. And to extend the URL, I just needed to add a / to the end of URL:
location / {
proxy_pass https://sub2.domain.com/example/example2/; <-- Note the slash at the end
proxy_redirect off;
proxy_set_header X-Real-IP sub2.domain.com;
proxy_set_header X-Forwarded-For sub2.domain.com;
proxy_set_header Host sub2.domain.com;
}
Full code:
server {
listen 443 ssl http2; # managed by Certbot
<!-- ssl_certificate goes here -->
server_name sub.domain.com;
location / {
proxy_pass https://sub2.domain.com/example/example2/;
proxy_redirect off;
proxy_set_header X-Real-IP sub2.domain.com;
proxy_set_header X-Forwarded-For sub2.domain.com;
proxy_set_header Host sub2.domain.com;
}
}