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Describe the bug

the docs state

Generates an absolute URL if the protocol and host are non-null. See the remarks section for important security information.

but if you omit passing values or pass null it still generates an absolute URL, seeming based on the host header a request scheme of the request from http context https://github.com/dotnet/aspnetcore/blob/main/src/Mvc/Mvc.Core/src/UrlHelperExtensions.cs#L575

Expected Behavior

expect docs to not indicate absolute url requires thsoe params to be not null, should mention where it gets those values from if they are omitted or passed as null

Steps To Reproduce

n/a

Exceptions (if any)

n/a

.NET Version

6

Anything else?

No response