how to change url host link in backend server to another - apache

Question

I want to modify link content with any proxy as a reverse proxy (haproxy, nginx or apache).
The backend server has a simple link that redirects to another host ( this host is in an isolated network, only proxy have access).
But when I try to connect, this link redirects to host
unattainable for my, the proxy does not know and does not receive any request.
proxy = 10.10.10.1
backend = 30.30.30.1
link_to_another_host = 30.30.30.2
final_user = 10.10.10.3 ( cant connect to net 30.30.30.x )
Is there any way to solve this?
Simple haproxy example
#---------------------------------------------------------------------
# main frontend which proxys to the backends
#---------------------------------------------------------------------
frontend main
bind 10.10.10.1:443 ssl crt /etc/haproxy/haproxy.pem
# use_backend static if url_static
default_backend app
#---------------------------------------------------------------------
# round robin balancing between the various backends
#---------------------------------------------------------------------
backend app
balance roundrobin
server app1 30.30.30.1:443 check ssl verify none
link backend server app1
link_to_another_host

Answer 1

solved with nginx: replace url link with sub_filter important all compression disable
server {
listen 80 default_server;
listen [::]:80 default_server;
server_name null;
location / {
proxy_pass http://30.30.30.1/;
proxy_set_header Host $host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header Accept-Encoding ""; # no compression allowed or next won't work
sub_filter "http://30.30.30.2:8080" "http://10.10.10.1:80/new_link";
sub_filter_once off;
}
}