How Do I set login path in razor pages core?

Question

Why I am getting,  The path in 'value' must start with '/'. (Parameter 'value')

builder.Services.AddAuthentication(CookieAuthenticationDefaults.AuthenticationScheme)
                .AddCookie(options =>
                {
                    options.LoginPath = "/Login";
                });
ArgumentException: The path in 'value' must start with '/'. (Parameter 'value')

Answer 1

Why I am getting, The path in 'value' must start with '/'. (Parameter 'value')

In my test, I can reproduce the issue once I ommit the "/" from the login path. As you can see the error I reproduce:

I have tried in following way:

Login Convention I set:

builder.Services.AddMvc().AddRazorPagesOptions(options =>
{
    options.Conventions.AllowAnonymousToPage("/Login");
});

Cookie Authentication Configuration:

builder.Services.AddAuthentication(CookieAuthenticationDefaults.AuthenticationScheme)
                .AddCookie(options =>
                {
                    options.LoginPath = "/Login";
                });

Middleware I am using:

app.UseDeveloperExceptionPage();
app.UseHttpsRedirection();
app.UseStaticFiles();
app.UseRouting();
app.UseAuthorization();
app.MapRazorPages();
app.UseAuthentication();

Output: