Add 'samesite' to valid cookie attrs
@@ -59,7 +59,7 @@ class metaCookie(type):
_valid_attr = (
"version", "path", "domain", "secure",
- "comment", "expires", "max_age",
+ "comment", "expires", "max_age", "samesite",
# RFC 2965
"commentURL", "discard", "port",
# Microsoft Extension
