AspNet Core Identity, how set options.Cookie.SameSite?

Question

In the latest templates and libraries used httpsonly flag. How can I turn it off?

This same question is outdated and it did not have full configuration sample:

AspNet Core Identity - cookie not getting set in production

Answer 1

The answer by @poke did not help me set the value to SameSiteMode.None, atleast not in ASP.NET core 2.1.

Any value you set in configure application cookie is overridden by the MinimumSameSitePolicy setting of the cookie policy middleware.

To prevent the override, set MinimumSameSitePolicy for the UseCookiePolicy extension as SameSiteMode.None.

app.UseCookiePolicy(new CookiePolicyOptions
{
   MinimumSameSitePolicy = SameSiteMode.None
});

Then set the actual same site value in the AddCookie extension in the ConfigureServices method

services.AddAuthentication(CookieAuthenticationDefaults.AuthenticationScheme)
.AddCookie(options =>
{
    options => options.Cookie.SameSite = SameSiteMode.None;
});

Answer 2

For my case in asp.net core 3.1 two things in combination did the trick

services.ConfigureApplicationCookie(options =>
        {
            options.Cookie.SameSite = SameSiteMode.Unspecified;
        });

        services.AddAntiforgery(opts => {
            opts.Cookie.SameSite = SameSiteMode.Unspecified;
        });