Blazor Server authorization through Blazor pages, is it possible?

Question

C++ / C#

Good day.
The question is, is it possible to implement authorization through Blazor pages? Without the use of controllers, pre-created authorization pages from T-shirts and other things?
Tried with singInManager - got System.InvalidOperationException: "Headers are read-only, response has already started."
Tried through IHostEnvironmentAuthenticationStateProvider and ClaimsPrincipal principal = await SignInManager.CreateUserPrincipalAsync(user); but the session crashes even when you just reload the page.
It is important to make authorization on Blazor.