diff -r 0d55fb0217f1 Lib/http/cookiejar.py
--- a/Lib/http/cookiejar.py	Tue Feb 26 16:29:46 2013 +0000
+++ b/Lib/http/cookiejar.py	Tue Feb 26 18:27:57 2013 +0100
@@ -1915,7 +1915,7 @@
                     if expires is None:
                         discard = True
                     domain = h("domain")
-                    domain_specified = domain.startswith(".")
+                    domain_specified = bool(domain)
                     c = Cookie(h("version"), name, value,
                                h("port"), h("port_spec"),
                                domain, domain_specified, h("domain_dot"),