I can't make it work. I am doing something wrong but I don't know what. I also want to use a stand-alone kasm docker behind nginx -> https://192.168.1.245:6901/ What do I have to enter in NPM (nginx)?

This is not working:

location / {
    proxy_pass https://192.168.1.245:6901;
    proxy_set_header Authorization "Basic a2FzbV91c2VyOnBhc3N3b3Jk";
    proxy_pass_header Authorization;
    proxy_set_header Host $host;
    proxy_set_header X-Forwarded-Scheme $scheme;
    proxy_set_header X-Forwarded-Proto  $scheme;
    proxy_set_header X-Forwarded-For    $remote_addr;
    proxy_set_header Upgrade $http_upgrade;
    proxy_set_header Connection $http_connection;
    proxy_http_version 1.1;
}