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[3.14] gh-136992: Add "None" as valid SameSite value as per RFC 6265bis (GH-137040) #137140

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[3.14] gh-136992: Add "None" as valid SameSite value as per RFC 6265bis (GH-137040) #137140

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9 changes: 6 additions & 3 deletions Doc/library/http.cookies.rst
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Expand Up @@ -148,9 +148,12 @@ Morsel Objects
in HTTP requests, and is not accessible through JavaScript. This is intended
to mitigate some forms of cross-site scripting.

The attribute :attr:`samesite` specifies that the browser is not allowed to
send the cookie along with cross-site requests. This helps to mitigate CSRF
attacks. Valid values for this attribute are "Strict" and "Lax".
The attribute :attr:`samesite` controls when the browser sends the cookie with
cross-site requests. This helps to mitigate CSRF attacks. Valid values are
"Strict" (only sent with same-site requests), "Lax" (sent with same-site
requests and top-level navigations), and "None" (sent with same-site and
cross-site requests). When using "None", the "secure" attribute must also
be set, as required by modern browsers.

The attribute :attr:`partitioned` indicates to user agents that these
cross-site cookies *should* only be available in the same top-level context
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