Which of the following is not included in the cookie header information?

The cookie header information typically includes various attributes that govern how cookies are managed by browsers and servers. Among those attributes, the "expires" attribute is indeed part of the cookie's properties. It defines when the cookie will expire and thus when it should be deleted. When a cookie is set, it often contains an "expires" attribute that is formatted as a date, indicating the end of the cookie's validity. This attribute directly affects the cookie's lifecycle and its presence on the client side.

The other attributes found in the cookie header, such as "domain," "path," and "Secure," serve different purposes. The domain specifies which domains can access the cookie, the path restricts the cookie's accessibility to certain paths within the domain, and the Secure attribute indicates that the cookie should only be transmitted over secure HTTPS connections. Therefore, "expires" truly is part of the cookie header information, confirming that it is incorrect to state that it is not included.