We currently implement the official cookie RFC, which was last updated
in 2011. Unfortunately, web reality conflicts with the RFC. For example,
all of the major browsers allow nameless cookies, which the RFC forbids.
There has since been draft versions of the RFC published to address such
issues. This patch implements the latest draft.
Major differences include:
* Allowing nameless or valueless (but not both) cookies
* Formal cookie length limits
* Formal same-site rules (not fully implemented here)
* More rules around cookie domains