immich nginx reverse proxy with base url (not a full/complete nginx config) base url is /immich (if you want something other, replace "/immich" with other path

nginx.conf

pid /run/nginx/nginx.pid;
error_log stderr;
daemon off;
events {
}
http {
  proxy_cache_path /var/cache/nginx/immich_revprox keys_zone=immich_revprox:10m levels=1:2 use_temp_path=off inactive=1d max_size=1g;

  server {
    listen 0.0.0.0:443 ssl ;
    listen [::0]:443 ssl ;
    server_name example.com ;
    http2 on;

    location /immich {
      proxy_pass http://192.168.1.100:2283;
      rewrite /immich/(.*) /$1 break;

      proxy_set_header Accept-Encoding "gzip";
      gunzip on;

      proxy_pass_request_headers on;

      proxy_buffering        on;
      proxy_cache            immich_revprox;
      proxy_cache_valid      200 206 1d;

      sub_filter_once off;
      sub_filter_types text/html;
      sub_filter ' href="/' ' href="/immich/';
      sub_filter ' src="/' ' src="/immich/';
      sub_filter ' action="/' ' action="/immich/';
      sub_filter 'import("/_app' 'import("/immich/_app';
      sub_filter 'base: ""' 'base: "/immich"';

      location /immich/_app/immutable/chunks {
        sub_filter_types *;
        sub_filter '"/api/socket.io"' '"/immich/api/socket.io"';

        proxy_pass http://10.8.1.1:2283;
        rewrite /immich/(.*) /$1 break;
      }

      location ~ /immich/_app/immutable/chunks/(index|app)\\. {
        sub_filter_types *;
        sub_filter '"/' '"/immich/';

        proxy_pass http://10.8.1.1:2283;
        rewrite /immich/(.*) /$1 break;
      }

      location ~ /immich/_app/immutable/chunks/constants {
        sub_filter_types *;
        sub_filter '="/' '="/immich/';

        proxy_pass http://10.8.1.1:2283;
        rewrite /immich/(.*) /$1 break;
      }

      location ~ /immich/_app/immutable/chunks/asset-utils {
        sub_filter_types *;
        sub_filter 'basePath:"/api"' 'basePath:"/immich/api"';

        proxy_pass http://10.8.1.1:2283;
        rewrite /immich/(.*) /$1 break;
      }

      location ~ /immich/_app/immutable/chunks/fetch-client\\. {
        sub_filter_types *;
        sub_filter 'baseUrl:"/api' 'baseUrl:"/immich/api';

        proxy_pass http://10.8.1.1:2283;
        rewrite /immich/(.*) /$1 break;
      }

      location ~ /immich/_app/immutable/chunks/api\\. {
        proxy_pass http://10.8.1.1:2283;
        rewrite /immich/(.*) /$1 break;

        sub_filter_types *;
        sub_filter '="/api"' '="/immich/api"';
        sub_filter 'basePath:"/api"' 'basePath:"/immich/api"';
      }

      location ~ /immich/api/socket.io {
        proxy_pass http://10.8.1.1:2283;
        rewrite /immich/(.*) /$1 break;

        proxy_cache off;

        proxy_set_header Accept-Encoding $http_accept_encoding;
        proxy_set_header Connection "upgrade";
        proxy_set_header Upgrade websocket;
      }

      location ~ /immich/api {
        proxy_pass http://10.8.1.1:2283;
        rewrite /immich/(.*) /$1 break;

        proxy_cache off;

        sub_filter_types *;
        sub_filter '"redirectUri":"/' '"redirectUri":"/immich/';
      }
    }

    proxy_pass_request_headers on;
    proxy_http_version 1.1;
    proxy_set_header Upgrade $http_upgrade;
    proxy_set_header Connection $connection_upgrade;

    slice              10m;
    proxy_cache_key    $uri$is_args$args$slice_range;
    proxy_cache_lock on;
    proxy_cache_lock_timeout 0s;
    proxy_cache_lock_age 200s;
    proxy_cache_min_uses 1;

    proxy_set_header   Range $slice_range;
    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_set_header   X-Forwarded-Host $host;
    proxy_set_header   X-Forwarded-Server $host;

    proxy_cache_use_stale  error timeout invalid_header updating
    http_500 http_502 http_503 http_504;

    proxy_redirect     off;
  }
}

Hello,

Thank you very much for the configuration file; it has been extremely helpful!

However, after updating Immich to version v1.124.0 this morning, I encountered a significant issue. The update caused everything to break, and I received the following error:

Error: Error: 404
    at Object.ht [as ok] (https://mydomain.com/immich/_app/immutable/chunks/fetch-client.DqMPutSq.js:1:7918)
    at async Promise.all (index 0)
    at async n (https://mydomain.com/immich/_app/immutable/chunks/server-config.store.DzAD3Dok.js:1:530)
    at async o (https://mydomain.com/immich/_app/immutable/chunks/server.B9uUtD4f.js:1:224)
    at async ra (https://mydomain.com/immich/_app/immutable/nodes/0.CItVphcP.js:1:2484)
    at async Wt (https://mydomain.com/immich/_app/immutable/chunks/entry.CGh5KwEn.js:1:17711)

After some troubleshooting, I managed to create a configuration file that works for me. Additionally, I included support for large file uploads with the following directive:

client_max_body_size 50000M;

Here is my immich.conf

location /api/ {
    return 301 /immich$request_uri;
}

location /immich {
    proxy_pass http://127.0.0.1:2283;
    rewrite /immich/(.*) /$1 break;

    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 X-Forwarded-Proto $scheme;
    proxy_set_header Accept-Encoding "gzip";
    
    gunzip on;
    proxy_pass_request_headers on;
    proxy_buffering on;
    proxy_cache_valid 200 206 1d;

    sub_filter_once off;
    sub_filter ' href="/' ' href="/immich/';
    sub_filter ' src="/' ' src="/immich/';
    sub_filter ' action="/' ' action="/immich/';
    sub_filter 'import("/_app' 'import("/immich/_app';
    sub_filter 'base: ""' 'base: "/immich"';
    sub_filter '"/api/' '"/immich/api/';

    # Handle the root path assets
    location /immich/ {
        proxy_pass http://127.0.0.1:2283/;
        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 X-Forwarded-Proto $scheme;
    }

    # Handle JavaScript files
    location ~ \.js$ {
        sub_filter_types application/javascript;
        sub_filter '"/api/' '"/immich/api/';
        sub_filter_once off;

        proxy_pass http://127.0.0.1:2283;
        rewrite /immich/(.*) /$1 break;
    }

    location ~ /immich/_app/immutable/chunks/fetch-client\\. {
        sub_filter_types application/javascript;
        sub_filter 'baseUrl:"/api' 'baseUrl:"/immich/api';
        sub_filter '"/api/' '"/immich/api/';
        sub_filter_once off;

        proxy_pass http://127.0.0.1:2283;
        rewrite /immich/(.*) /$1 break;
    }

    # Handle WebSocket connections
    location ~ /immich/api/socket.io {
        proxy_pass http://127.0.0.1:2283;
        rewrite /immich/(.*) /$1 break;

        proxy_cache off;
        proxy_buffering off;

        proxy_set_header Accept-Encoding $http_accept_encoding;
        proxy_set_header Connection "upgrade";
        proxy_set_header Upgrade websocket;
        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 X-Forwarded-Proto $scheme;
    }

    # Handle API requests
    location ~ /immich/api {
        proxy_pass http://127.0.0.1:2283;
        rewrite /immich/(.*) /$1 break;

        proxy_cache off;
        proxy_buffering off;

        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 X-Forwarded-Proto $scheme;

        sub_filter_types *;
        sub_filter '"redirectUri":"/' '"redirectUri":"/immich/';
    }
}

I still have an issue on the administration panel where all links in the menu are rewritten with a second /immich, resulting in the following error:

Not found: /immich/immich/admin/library-management - 404
undefined

I can't figure out why this is happening. If anyone has any ideas, I would greatly appreciate your help !

Have a nice day !