What checks does Oh Dear! perform?

Oh Dear! consists of several checks to make your life as a developer or sysadmin easier. In general, there are 4 kinds of categories that we validate on your behalf.

  1. Uptime: as soon as one of your sites is down, we can notify you.
  2. SSL/TLS health: if a certificate is due to expire, has insecure ciphers or has been revoked, we'll let you know.
  3. Content validation: we crawl your sites and will notify you when we detected mixed content.
  4. Broken links: we crawl your site and will notify you when we detected a broken link.

All the ip addresses Oh Dear! uses to check your sites are listed on this page.

Each check is further described in more detail.