If a cookie's Domain and Path attributes are not specified by the server, they default to the domain and path of the resource that was requested.  However, in most browsers there is a difference between a cookie set from without a domain, and a cookie set with the domain. In the former case, the cookie will only be sent for requests to , also known as a host-only cookie. In the latter case, all sub domains are also included (for example, ).   A notable exception to this general rule is Internet Explorer, which always sends cookies to sub domains regardless of whether the cookie was set with or without a domain.