ReplaceRedirector() implementation

Startup.cs

static Func<RedirectContext<CookieAuthenticationOptions>, Task> ReplaceRedirector(
    HttpStatusCode statusCode,
    Func<RedirectContext<CookieAuthenticationOptions>, Task> existingRedirector) => context =>
    {
        if (context.Request.Path.StartsWithSegments("/accounts"))
        {
            context.Response.StatusCode = (int) statusCode;
            return Task.CompletedTask;
        }
        return existingRedirector(context);
    };