  # Cookie name. This can be whatever you want.
  SESSION_COOKIE_NAME = 'sessionid'
  # Age of cookie, in seconds (default: 2 weeks).
  SESSION_COOKIE_AGE = 60 * 60 * 24 * 7 * 2
  # A string like ".example.com", or None for standard domain cookie.
  SESSION_COOKIE_DOMAIN = None
  # Whether the session cookie should be secure (https:// only).
  SESSION_COOKIE_SECURE = False
  # The path of the session cookie.
  SESSION_COOKIE_PATH = '/'
 
</s> remove       ``domain=".lawrence.com"`` will set a cookie that is readable by
      the domains www.lawrence.com, blogs.lawrence.com and
      calendars.lawrence.com. Otherwise, a cookie will only be readable by
      the domain that set it.
 </s> add       ``domain="example.com"`` will set a cookie that is readable by the
      domains www.example.com, blog.example.com, etc. Otherwise, a cookie will
      only be readable by the domain that set it. </s> remove ``".example.com"`` (note the leading dot!) for cross-domain cookies, or use
``None`` for a standard domain cookie.
 </s> add ``"example.com"`` for cross-domain cookies, or use ``None`` for a standard
domain cookie. </s> remove ``".example.com"`` (note the leading dot!) for cross-domain cookies, or use
``None`` for a standard domain cookie.
 </s> add ``"example.com"`` for cross-domain cookies, or use ``None`` for a standard
domain cookie. </s> remove ``".example.com"`` to allow a POST request from a form on one subdomain to be
 </s> add ``"example.com"`` to allow a POST request from a form on one subdomain to be
# A string like "example.com", or None for standard domain cookie.
  # Cookie name. This can be whatever you want.
  SESSION_COOKIE_NAME = 'sessionid'
  # Age of cookie, in seconds (default: 2 weeks).
  SESSION_COOKIE_AGE = 60 * 60 * 24 * 7 * 2
# A string like "example.com", or None for standard domain cookie.
  SESSION_COOKIE_DOMAIN = None
  # Whether the session cookie should be secure (https:// only).
  SESSION_COOKIE_SECURE = False
  # The path of the session cookie.
  SESSION_COOKIE_PATH = '/'
keep keep keep keep replace keep keep keep keep keep
 Fixed #28741 -- Removed unnecessary leading dot from cross-domain cookie examples. 
django/conf/global_settings.py