C#•2y ago

OnAppendCookie callback doesn't work

I have an ASP.NET Core project, which uses IdentityServer4. In my configuration I have CookiePolicyOptions which contains the next setup:

services.Configure<CookiePolicyOptions>(
    option =>
    {
        option.MinimumSameSitePolicy = SameSiteMode.None;
        option.HttpOnly = Microsoft.AspNetCore.CookiePolicy.HttpOnlyPolicy.Always;
        option.OnAppendCookie = cookieContext =>
        {
            Console.WriteLine("Cookie appended: " + cookieContext.CookieName);
        };
        option.OnDeleteCookie = context =>
        {
            Console.WriteLine("Cookie deleted: " + context.CookieName);
        };
    });

services.Configure<CookiePolicyOptions>(
    option =>
    {
        option.MinimumSameSitePolicy = SameSiteMode.None;
        option.HttpOnly = Microsoft.AspNetCore.CookiePolicy.HttpOnlyPolicy.Always;
        option.OnAppendCookie = cookieContext =>
        {
            Console.WriteLine("Cookie appended: " + cookieContext.CookieName);
        };
        option.OnDeleteCookie = context =>
        {
            Console.WriteLine("Cookie deleted: " + context.CookieName);
        };
    });

For some reason, I can't reach the code from the OnAppendCooie and OnDeleteCookie. I've also added a custom filter to append a new cookie to the response. The behavior was still the same - OnAppendCookie and OnDeleteCookie were not called.

2 Replies

no >> body•2y ago

My filter looks like this

public class MyCustomFilter : ResultFilterAttribute
{
    public override void OnResultExecuting(ResultExecutingContext context)
    {
        context.HttpContext.Response.Cookies.Append("MyCustomCookie", "Blah-Blah");
        base.OnResultExecuting(context);
    }
}

public class MyCustomFilter : ResultFilterAttribute
{
    public override void OnResultExecuting(ResultExecutingContext context)
    {
        context.HttpContext.Response.Cookies.Append("MyCustomCookie", "Blah-Blah");
        base.OnResultExecuting(context);
    }
}

and registration

services.AddControllersWithViews(c =>
{
    c.Filters.Add(new MyCustomFilter());
});

services.AddControllersWithViews(c =>
{
    c.Filters.Add(new MyCustomFilter());
});

no >> body•2y ago

Am I missing something? I thought it should trigger when every cookie appends The example application https://github.com/ihordyrman/CookieTest/blob/main/Program.cs Alright, I found the reason. It requires an additional middleware.

app.UseCookiePolicy();

app.UseCookiePolicy();

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OnAppendCookie callback doesn't work