nginx reverse proxy for prometheus HTTP Basic Auth

prometheus.conf

server {
  listen 80;
  server_name <YOUR_DOMAIN_NAME>;  

  auth_basic "prometheus auth";
  auth_basic_user_file /etc/nginx/.htpasswd_prometheus; 

  location / {
    proxy_read_timeout 1800s;
    proxy_connect_timeout 1600s;
    proxy_pass http://localhost:9090;
    proxy_http_version 1.1;
    proxy_set_header Upgrade $http_upgrade;
    proxy_set_header Connection $connection_upgrade;
    proxy_set_header Connection "Keep-Alive";
    proxy_set_header Proxy-Connection "Keep-Alive";
    proxy_redirect off;
  }

  location /ready {
    proxy_pass http://localhost:9090;
    proxy_http_version 1.1;
    proxy_set_header Connection "Keep-Alive";
    proxy_set_header Proxy-Connection "Keep-Alive";
    proxy_redirect off;
    auth_basic "off";
  }
}