Reading the documentation is helpful
Manual/Security - Unraid | Docs
Redirects
When accessing http://[ipaddress] or http://[servername].[localTLD] , the behavior will change depending on the value of the Use SSL/TLS setting:
If Use SSL/TLS is set to Strict, you will be redirected to https://[lan-ip].[hash].myunraid.net However, this behavior makes it more difficult to access your server when DNS is unavailable (i.e. your Internet goes down). If that happens see the note under Https with Unraid.net certificate - with no fallback URL
If Use SSL/TLS is set to Yes, you will be redirected to https://[ipaddress] or https://[servername].[localTLD] as that will likely work even if your Internet goes down.
If Use SSL/TLS is set to No, then the http url will load directly.
Note: for the redirects to work, you must start from http urls not https urls.