Every check ยท HTTPS
www and the bare domain
What it checks
Whether both example.com and www.example.com answer over HTTPS, and lead to the same address.
Why it matters
People type both. One that gives an error loses them, and two that both serve the site split it in two for search engines.
How to fix it
- Give the other name a DNS record and a certificate.
- Redirect it to the address you use, with a 301 that keeps the path.
Check a site for this and everything else: snag.page. More on https: HTTPS Redirect to HTTPS No downgrade HSTS Certificate renewal