Describe the feature request

DOMAIN_EXPIRATION should automatically pick up the root domain in a HTTP(S) url and check the expiry for that. Currently, it does not and fails with a negative date:

[DOMAIN_EXPIRATION] (-9223372036854) > 720h (2592000000)

because the ExpiryDate resolves to an invalid date: 0001-01-01 00:00:00 +0000 UTC.

Why do you personally want this feature to be implemented?

I want a single status check that checks for 3 conditions: domain expiry, cert expiry, and website status. However, the website is often published on a subdomain only such as www.

- name: gully-tours
  interval: 6h
  client:
    timeout: 30s
  conditions:
    - "[STATUS] == 200"
    - "[DOMAIN_EXPIRATION] > 720h"
    - "[CERTIFICATE_EXPIRATION] > 240h"
    url: https://www.gully.tours/

In such cases, the DOMAIN_EXPIRATION check should be smart enough to use gully.tours as the domain name instead of www.gully.tours.

How long have you been using this project?

No response

Additional information

I checked ExpirationDate in the twin/whois library for both, and perhaps this could be resolved at the whois layer using the public suffix list?

• gully.tours - 2026-03-26 12:11:13 +0000 UTC
• www.gully.tours - 0001-01-01 00:00:00 +0000 UTC