A way to remove specific cookie from HttpRequestHeaders in WebApi

Question

I'm trying to remove specific Set-Cookie header from HttpResponseHeaders in OnActionExecuted method of ActionFilter.

I'm having few issues with that:

1. I cannot see the way of enumerate headers. The collection is always empty, even if I see headers in debugger.
2. Because I cannot enumerate, I cannot remove specific header. I can only remove all headers with the same key, but Set-Cookie can have multiple entries.

Currently I'm removing all cookies, but this is not what I want.

public override void OnActionExecuted(HttpActionExecutedContext actionExecutedContext)
{                
   HttpResponseHeaders headers = actionExecutedContext.Response.Headers;
   IEnumerable<string> values;
   if (headers.TryGetValues("Set-Cookie", out values))
   {
       actionExecutedContext.Response.Headers.Remove("Set-Cookie");
   }

   base.OnActionExecuted(actionExecutedContext);
}

Answer 1

From the link:

You cannot directly delete a cookie on a user's computer. However, you can direct the user's browser to delete the cookie by setting the cookie's expiration date to a past date. The next time a user makes a request to a page within the domain or path that set the cookie, the browser will determine that the cookie has expired and remove it.

So, how to remove/delete cookie in ASP.NET Web Api at action filter level, just try to set expiration date of cookie to a past date:

public override void OnActionExecuted(HttpActionExecutedContext actionExecutedContext)
{
    var response = actionExecutedContext.Response;
    var request = actionExecutedContext.Request;

    var currentCookie = request.Headers.GetCookies("yourCookieName").FirstOrDefault();
    if (currentCookie != null)
    {
        var cookie = new CookieHeaderValue("yourCookieName", "")
        {
            Expires = DateTimeOffset.Now.AddDays(-1),
            Domain = currentCookie.Domain,
            Path = currentCookie.Path
        };

        response.Headers.AddCookies(new[] { cookie });
    }

    base.OnActionExecuted(actionExecutedContext);
}