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docs: describe and highlight super cookies

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Reported-by: Yadhu Krishna M

Closes #12687
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Daniel Stenberg 2024-01-12 16:50:44 +01:00
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19
docs/HTTP-COOKIES.md
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@ -34,6 +34,25 @@
over plain HTTP for this host. curl does this to match how popular browsers
work with secure cookies.
## Super cookies
A single cookie can be set for a domain that matches multiple hosts. Like if
set for `example.com` it gets sent to both `aa.example.com` as well as
`bb.example.com`.
A challenge with this concept is that there are certain domains for which
cookies should not be allowed at all, because they are *Public
Suffixes*. Similarly, a client never accepts cookies set directly for the
top-level domain like for example `.com`. Cookies set for *too broad*
domains are generally referred to as *super cookies*.
If curl is built with PSL (**Public Suffix List**) support, it detects and
discards cookies that are specified for such suffix domains that should not
be allowed to have cookies.
if curl is *not* built with PSL support, it has no ability to stop super
cookies.
## Cookies saved to disk
Netscape once created a file format for storing cookies on disk so that they