nginx config - remove trailing slash from location block

[mStirner]

Current configuration with trailing slash does not work for the URL http://open-haus.lan/auth, it returns a 404.
Remove the trailing slash from the location block:

map $http_upgrade $connection_upgrade {
  default upgrade;
  ''      close;
}

server {

    ...

    location ~ ^/(api|auth) {
        proxy_pass http://127.0.0.1:8080$uri$is_args$args;
        proxy_http_version 1.1;
        proxy_set_header X-Forwarded-Proto $scheme;
        proxy_set_header Connection $connection_upgrade;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    }

}