Hi, Where should developers give feedback about this proposal?
The changes to the Accept-Language header are ameliorated by the Variants header. Is there any such mechanism proposed for the changes to the JS interface? Thanks, Brian 2022年10月28日金曜日 2:57:18 UTC+9 vict...@chromium.org: > Contact emails > > vict...@chromium.org, mike...@chromium.org > > Explainer > > https://github.com/Tanych/accept-language > > Specification > > Variants header: > https://datatracker.ietf.org/doc/html/draft-ietf-httpbis-variants-06 > > Summary > > We want to reduce the amount of information the Accept-Language header > exposes in HTTP requests and JS interface navigator.languages. Instead of > sending all user’s Accept-Language, we only send the user’s most preferred > language after language negotiation in the Accept-Language header. > navigator.languages returns the same value as navigator.language during > this experiment. > > We would like to run an origin trial for sites to opt into the Reduce > Accept-Language origin trial to proactively test for breakage. See below > for more details. > > Implementation Doc > > https://docs.google.com/document/d/1RkPDf7DNtcOj4KXeW8wNCuYfto-drnGYST_NvZe3GoY > > Blink component > > Privacy>Fingerprinting > <https://bugs.chromium.org/p/chromium/issues/list?q=component:Privacy%3EFingerprinting> > > Risks > > Interoperability and Compatibility > > The compatibility risk is low since we're planning to reduce the amount of > information in the Accept-Language header and navigator.languages, rather > than remove the header or change value format in the header. Most existing > Accept-Language detection code should continue to work. > > As for interoperability, no signal for other vendors. For multilingual > sites to rely on the Accept-Language header, developers would need to > depend on a user's full Accept-Language list for some browsers and a > primary user's Accept-Language for others. > > Another signal is that the Chrome incognito model already reduced the > Accept-Language header and JS interface navigator.languages to one > language. The Accept-Language header can potentially expand to two if the > first Accept-Language includes a region code, like en-US, the reduced > Accept-Language header will be en-US,en;q=0.9. > > Experiment Summary > > The experiment is going to be a little different from a normal Origin > Trial. The goal is enabling developers to test and ensure compatibility > with our proposed changes. It’s incredibly important we give developers any > chance to test systems at every level since this change represents vast > dependencies on the introduced headers. > > As for enabling with the origin trial itself, there will be two components > controlled by the same origin trial: > > - > > Reducing the information in navigator.languages if the origin trial > enabled. > - > > The Accept-Language HTTP request header contains the user’s primary > preferred language, this can change if we detect a more preferred language > during the language negotiation process. > > Because of the experimental nature of reducing Accept-Language, a valid > origin token must be sent in the response header by origins which opt-in > the origin trial. Also two new headers Variants > <https://datatracker.ietf.org/doc/html/draft-ietf-httpbis-variants-06#section-2> > > (indicating sites supporting languages) accept-language and > Content-Language <https://datatracker.ietf.org/doc/html/rfc3282> need to > be sent in the response header in order to make the language negotiation to > work correctly. > > Please see the design and implementation document > <https://docs.google.com/document/d/1RkPDf7DNtcOj4KXeW8wNCuYfto-drnGYST_NvZe3GoY/edit#heading=h.b6kmd248xsy4>for > > more information. > > Experiment Goals > > The goal of this origin trial is to enable developers to test how reducing > the Accept-Language request header and the JS getter navigator.languages > will affect their systems, especially to understand the user cases on > navigator.languages. We hope this can provide sufficient time for > developers to test. We can validate our current plans for reducing > Accept-Language and safely roll out them to the web based on their feedback. > > We will be relying heavily on user and developer feedback to identify > where breakage occurs, or where use cases are not accounted for, > especially for multilingual sites depending on the Accept-Language header, > and navigator.languages. We will create a GitHub repository and a public > mailing list for gathering feedback. When the origin trial is ready, we > plan to publish developer guidance on how to enroll and provide feedback. > > Experiment Risks > > There are some risks, as many multilingual sites have come to rely on the > value in Accept-Language header and JS interfaces navigator.languages to > send the right representation pages to the user. Site breakage can take > many forms, both obvious and non-obvious. However, since sites are in > control of the Origin-Trial, Variants and Content-Language headers, a site > can quickly opt out of the experiment when breakage is encountered. > > Will this feature be supported on all six Blink platforms (Windows, Mac, > Linux, Chrome OS, Android, and Android WebView)? > > No (All but WebView) > > Is this feature fully tested by web-platform-tests > <https://chromium.googlesource.com/chromium/src/+/master/docs/testing/web_platform_tests.md> > ? > > No (We fully test in browser_tests, WPT has limits to cover all the test > cases in Accept-Language header). > > Flag name > > ReduceAcceptLanguageOriginTrial > Tracking bug > > https://bugs.chromium.org/p/chromium/issues/detail?id=1306905 > Launch bug > > https://bugs.chromium.org/p/chromium/issues/detail?id=1307484 > Link to entry on the Chrome Platform Status > > https://chromestatus.com/feature/5188040623390720 > <https://chromestatus.com/feature/5188040623390720#details> > > -- You received this message because you are subscribed to the Google Groups "blink-dev" group. 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