upstream api {
  least_conn;
  server 10.0.0.11:8080 weight=9;
  server 10.0.0.12:8080 weight=1;
}
map $http_cookie $sticky {
  default $cookie_app;
}
server {
  listen 443 ssl http2;
  server_name api.example.com;
  ssl_certificate     /etc/ssl/fullchain.pem;
  ssl_certificate_key /etc/ssl/privkey.pem;
  location / {
    proxy_set_header Host $host;
    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    proxy_pass http://api;
  }
}

frontend https-in
  bind :443 ssl crt /etc/ssl/cert.pem alpn h2,http/1.1
  default_backend api

backend api
  balance leastconn
  http-check send meth GET uri /health
  server s1 10.0.0.11:8080 check weight 9
  server s2 10.0.0.12:8080 check weight 1
  cookie SRV insert indirect nocache