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Make it explicit that user agents can modify or omit hints #121

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merged 6 commits into from
Jul 6, 2022
Merged

Make it explicit that user agents can modify or omit hints #121

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8151ffd
Fixes & Clarifications based on WebKit feedback
arichiv Jul 1, 2022
ca2ab17
Update index.bs
arichiv Jul 6, 2022
2d74024
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arichiv Jul 6, 2022
41cc084
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arichiv Jul 6, 2022
849cef9
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arichiv Jul 6, 2022
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arichiv Jul 6, 2022
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11 changes: 9 additions & 2 deletions index.bs
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Expand Up @@ -224,13 +224,15 @@ following steps:
<li>Run [=retrieve the client hints set=] with |settingsObject|.
<li>For each [=client hints token=] |lowEntropyHint| in the registry's [=low entropy hint table=], [=set/append=] |lowEntropyHint| to |hintSet|.
<li>If |request|'s [=request/client=] is not null, then for each [=client hints token=] |requestHint| in
|request|'s [=environment settings object/client hints set=], [=set/append=] |requestHint| to
|settingsObject|'s [=environment settings object/client hints set=], [=set/append=] |requestHint| to
|hintSet|.
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<li>For each |hintName| in |hintSet|:
<ol>
<li>If |request| is not a [=navigation request=] for a "document" [=request/destination=] and if the result of running [[permissions-policy#algo-should-request-be-allowed-to-use-feature]]
given |request| and |hintName|'s associated feature in [[#policy-controlled-features]] returns `false`, then continue to next |hintName|.
<li>If the user agent decides, in an [=implementation-defined=] way (see [[#privacy]]), to omit this hint then continue.
<li>Let |value| be the result of running [=find client hint value=] with |hintName|.
<li>If the user agent decides, in an [=implementation-defined=] way (see [[#privacy]]), to modify |value| then do so.
<li>[=header list/append=] |hintName|/|value| to the [=request/header list=].
</ol>
</ol>
Expand Down Expand Up @@ -392,7 +394,12 @@ Issue: Links for image features are broken, need to actually define that and lin

Security and Privacy considerations {#privacy}
===========
See [[!RFC8942]].

This specification exposes information regarding the user's preferences and agent, which can be used as an active fingerprinting vector.
[=User agents=] implementing this specification need to be aware of that, and take that into consideration when deciding whether to implement specific hints,
modify their returned values for a given hint, or omit the hint entirely.

For example, the user might have a site specific setting to override or disable specific client hints to reduce the potential for fingerprinting.

Terms {#terms}
====
Expand Down