Wildcards in callback URLs

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You can use wildcards with some restrictions, albeit it is not recommended:

You can use the star symbol (*) as a wildcard for subdomains, but it must be used in accordance with the following rules in order to properly function:

  • The protocol of the URL must be http: or https:. com.example.app://*.example.com will not work.
  • The wildcard must be located in a subdomain within the hostname component. https://*.com will not work.
  • The wildcard must be located in the subdomain furthest from the root domain. https://sub.*.example.com will not work.
  • The URL must not contain more than one wildcard. https://*.*.example.com will not work.
  • A wildcard may be prefixed and/or suffixed with additional valid hostname characters. https://prefix-*-suffix.example.com will work.
  • A URL with a valid wildcard will not match a URL more than one subdomain level in place of the wildcard. https://*.example.com will not work with https://sub1.sub2.example.com.
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