Icinga2 proxy through Nginx

nginx-site.conf

server {
    listen 80 default_server;
    listen [::]:80 default_server;

    root /var/www/html;
    index index.html;
    server_name icinga.example.com;

    location ~ ^/icinga2 {
        return 301 https://$server_name$request_uri;
    }
    
    # any other config
}

server {
    listen 443 ssl default_server;
    listen [::]:443 ssl default_server;

    ssl_certificate /etc/nginx/certs/icinga.example.com.full.crt;
    ssl_certificate_key /etc/nginx/certs/icinga.example.com.key;

    root /var/www/html;
    index index.html;
    server_name icinga.example.com;

    location = /icinga2 {
        return 301 /icinga2/;
    }
    location /icinga2/ {
        proxy_pass https://127.0.0.1:5665/;
        proxy_ssl_trusted_certificate /var/lib/icinga2/certs/ca.crt;
        proxy_http_version 1.1;
        include proxy_params;
    }
    
    # any other config
}