Remove Cookie issue

Question

I have a cookie save a token when a user logs into www.example.com and then it redirects them to example.com/desktop or example.com/mobile depending on what device they\'re usin

Answer 1

Because the cookie was set at another path, you have to use Cookies.removeCookie("cookieName", "/") (/ being the path used in your example) and not Cookies.removeCookie("cookieName").

This is because without a specified path, the path defaults to the one of the current page (see document.cookie).

So, you're trying to remove the cookie at path=/desktop, whereas it's actually at path=/, so the removal fails.
Remember that you could have two cookies with the same name but different paths; so you could have a cookieName at path=/ and a _cookieName at path=/desktop. Removing the cookie at path=/ won't remove the one at path=/desktop, and conversely, removing the one at path=/desktop won't remove the one at path=/. As a side note: when accessing /desktop, the browser would send both cookies, which could have different values.

In brief, because you set your cookie at /, remember to always pass / as the path, everywhere, or you could create a new cookie rather than modifying the existing one, or fail to remove it (which you're experiencing right now).

See also Cookies.removeCookie(String,String)

Answer 2

In case you also need a non-default domain use

public static native void removeCookie(String name, String path, String domain) /*-{
    $doc.cookie = name + "=" + ((path) ? ";path=" + path : "")
            + ((domain) ? ";domain=" + domain : "")
            + ";expires=Thu, 01 Jan 1970 00:00:01 GMT";
}-*/;