Nginx reverse_proxy from domainA.it/appA to domainB.it/appB maintining the original url ( domainA/appA ) - nginx

Question

i need to implement this configuration in my nginx web server ( reverse_proxy ):
I have a domain like www.domainA.it where respond my site, then i need to publish antother "app" from my www.domainA.it/appA, the application respond to another domain like www.domainB.it/appB
The nginx configuration that i have implement is like this:
server {
listen 443;
server_name www.domainA.it domainA.it;
error_log ssl_error.log;
access_log ssl_access.log;
ssl on;
ssl_certificate my.crt;
ssl_certificate_key my.key;
include /etc/nginx/sec.conf;
add_header 'Access-Control-Allow-Origin' *;
location / {
add_header 'Access-Control-Allow-Origin' *;
proxy_set_header Host $host;
proxy_set_header X-Forwarded-Host $host;
proxy_set_header X-Forwarded-Proto $scheme;
proxy_pass https://my-backend;
}
location /appA {
proxy_pass https://domainB/appB/;
proxy_http_version 1.1;
add_header Access-Control-Allow-Origin *;
proxy_set_header Host $proxy_host;
proxy_set_header X-Forwarded-Host $host;
proxy_set_header X-Forwarded-Proto $scheme;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
}
}
With this configuration i recive the error like this:
https://www.domainA.it/appB/... 404 not found
https://www.domainA.it/appB/... 404 not found
.
.
.
If i expose the same location www.domainA/appB , all it's work fine
How i can do this ??
Thanks a lot

Answer 1

i have resolved this issue by modifing the backend context.
It works all fine with this configuration:
location /appA {
proxy_pass https://domainB/appA/;
proxy_http_version 1.1;
add_header Access-Control-Allow-Origin *;
proxy_set_header Host $proxy_host;
proxy_set_header X-Forwarded-Host $host;
proxy_set_header X-Forwarded-Proto $scheme;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
}
}