Can it be possible to make prefix for nginx-proxy-manager?

[efirlus]

I want to make address for nginx-proxy-manager, not npm.domain.name, but domain.name/npm

I tried this in advanced tab

location /npm/ {
  proxy_pass http://nginx-proxy-manager:81/;
  proxy_http_version 1.1;
  proxy_set_header Upgrade $http_upgrade;
  proxy_set_header Connection "Upgrade";
  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-Port $server_port;
  proxy_set_header X-Forwarded-Proto $scheme;
  proxy_set_header X-Forwarded-Prefix /npm;
}

but it's not worked.
browser console brings bunch of 404 failed for each elements.

I also tried proxy_pass http://127.0.0.1:81, same as above, not works

other containers are just finely works well, currently I use /portainer, /calibre, /qbit very well with similar options

[efirlus]

I got the answer from reddit.

proxy_set_header Accept-Encoding "";
sub_filter_once off;
sub_filter_types text/html application/javascript text/css;
sub_filter '/css' '/npm/css';
sub_filter '/js/' '/npm/js/';
sub_filter '"js/"' '"npm/js/"';
sub_filter '/images' '/npm/images';
sub_filter '/assets' '/npm/assets';
sub_filter '/api' '/npm/api';
sub_filter '/login' '/npm/login';

basic strategy is, just subfiltering every subpath.