How to configure nginx proxy_pass to internal servers by location?

Question

Nginx

There is a server with nginx (nginx/1.16.1) demo.test.local (192.168.220.11) and several servers with apache behind it (192.168.222.30, 192.168.222.32, 192.168.222.35). The task was set when calling https://demo.test.local/ <numeric_identifier> to redirect the request to apache, the server is selected depending on the <numeric_identifier>.
So far, for the test, I work with one server ip=192.168.222.35, <numeric_id>=123
nginx configuration

server {
        listen 443;
        server_name demo.test.local;
        access_log /var/log/nginx/t_access.log test;
        error_log /var/log/nginx/t_error.log info;
        ssl_certificate /etc/pki/tls/certs/test.local.crt;
        ssl_certificate_key /etc/pki/tls/private/test.key;
        location / {
#               try_files $uri @gm;  
        }
        location /123/ {
                proxy_pass https://192.168.222.35/;
                proxy_set_header Host $http_host;
                proxy_set_header X-Real-IP $remote_addr;
                proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
                proxy_set_header X-Forwarded-Proto $scheme;
                proxy_redirect / /123/;
        }
        location @gm {
               proxy_pass https://192.168.222.35;
        }
}

With this configuration, a redirect to the desired server occurs, but js and css are not loaded. in the logs

[28/Oct/2021:17:30:39 +0300] "302" "HOST=demo.test.local proxy-host=192.168.222.35 uri=/123/ query=- referrer=-
---------------------------------
[28/Oct/2021:17:30:39 +0300] "200" "HOST=demo.test.local proxy-host=192.168.222.35 uri=/123/Account/LogOn query=ReturnUrl=%2f referrer=-
---------------------------------
[28/Oct/2021:17:30:39 +0300] "404" "HOST=demo.test.local proxy-host=- uri=/front/dist/logon.vendor.434d9aea5bd43fa26608.css query=- referrer=-
---------------------------------
[28/Oct/2021:17:30:39 +0300] "404" "HOST=demo.test.local proxy-host=- uri=/front/dist/logon.dc155e55d90848a71888.css query=- referrer=-
---------------------------------
[28/Oct/2021:17:30:39 +0300] "404" "HOST=demo.test.local proxy-host=- uri=/front/dist/logon.vendor.434d9aea5bd43fa26608.js query=- referrer=-
---------------------------------
[28/Oct/2021:17:30:39 +0300] "404" "HOST=demo.test.local proxy-host=- uri=/front/dist/logon.dc155e55d90848a71888.js query=- referrer=-

If you uncomment the "try_files $uri @gm;" line, then the redirection works, the site is fully functional, but the meaning of <numeric_identifiers> and the ability to redirect to different servers are lost.

The main question is how to implement redirection in this test example so that identifiers are used?
Secondarily, how to solve the main problem with redirection?

Answer 1

Set the server to 192.168.222.35 so that it prefixes /123/links to js, ​​css, images, etc. How exactly to do this is highly dependent on the server.
But usually it's easier not to bother with this, but to raise subdomains.