Thanks! On Tuesday, April 26, 2022 at 9:11:17 AM UTC-7 abe...@chromium.org wrote:
> On Mon, Apr 25, 2022 at 9:14 PM Jerilyn D. <d.je...@gmail.com> wrote: > >> Hello, >> >> I just want to get confirmation for the following: >> 1) Going forward, the User-Agent http header will continue to return >> information but just reduced information. This http header will not be >> dropped or suddenly return empty string or null data in the future. >> > > That's correct > > >> 2) If we want more information, that is when we will need to use the new >> user-agent client hints http headers >> > > That's correct > > >> 3) Going forward, the navigator.useragent js api will continue to return >> information but just reduced information. It will not be dropped or >> suddenly return empty string or null data in the future. >> > > That's correct > > >> 4) Will the enterprise policy to disable user-agent reduction feature >> continue to work or will this eventually not be honored in future chrome >> versions (and which future chrome version) ? >> > > For now, we don't have a termination date for the enterprise policy, so > you can expect it to work for the foreseeable future. If we did decide to > end the enterprise policy of disabling UA reduction, we would give > enterprises plenty of notice and runway, but for now we have no plans to > remove this enterprise policy. > > >> >> Thanks! >> On Monday, April 18, 2022 at 2:51:22 PM UTC-7 abe...@chromium.org wrote: >> >>> Note: please see the “Experiment Timeline” section for our extension >>> request - the rest of the details are the same as before. >>> >>> Contact emails >>> >>> abe...@chromium.org, mike...@chromium.org >>> Original I2E >>> >>> https://groups.google.com/a/chromium.org/g/blink-dev/c/R0xKm1B7qoQ/ >>> >>> Explainer >>> >>> https://developer.chrome.com/blog/user-agent-reduction-origin-trial/ >>> >>> Specification >>> >>> None, but we intend to specify the reduced UA in >>> https://compat.spec.whatwg.org/#ua-string-section as it ships. >>> >>> Summary >>> >>> We want to reduce the amount of information the User Agent string >>> exposes in HTTP requests as well as in navigator.userAgent, >>> navigator.appVersion, and navigator.platform. The browser's brand and >>> significant version, its desktop/mobile distinction and the platform it is >>> running on will continue to be sent. >>> >>> We would like to run an Origin Trial for sites to opt into the Reduced >>> User-Agent (and related navigator properties) to proactively test for >>> breakage. See below for more details. >>> >>> Design Doc >>> >>> >>> https://docs.google.com/document/d/1feIxK9S7oNgT2oGGebbxE9X0O-4wTKcsP_gRaY99tq4/edit#heading=h.2navvbygwxwb >>> >>> >>> Blink component >>> >>> Blink >>> <https://bugs.chromium.org/p/chromium/issues/list?q=component:Blink> >>> >>> TAG review >>> >>> https://github.com/w3ctag/design-reviews/issues/640 >>> >>> TAG review status >>> >>> Closed as “Satisfied with concerns” ( >>> https://github.com/w3ctag/design-reviews/issues/640) >>> >>> Risks: Interoperability and Compatibility >>> >>> The compatibility risk is low, as we’re planning to reduce the amount of >>> information in the UA string, rather than remove the header. Most existing >>> UA detection code should continue to work. It is only future UA detection >>> code that will need to move to use the UA client hints instead. In the long >>> term, we expect this change to improve compatibility, as UA detection based >>> on UA-CH is bound to be more reliable than the current status quo. We hope >>> this Origin Trial will help us flesh out site compat issues we can’t >>> predict a priori. >>> >>> As for interoperability, other vendors are on board with UA information >>> reduction, but not necessarily with the UA Client Hints mechanism that is >>> supposed to replace it. That can create a tricky situation, where >>> developers would need to rely on the User-Agent string for some browsers >>> and on UA-CH for others. >>> >>> Edge: Positive signals ( >>> https://twitter.com/_scottlow/status/1206831008261132289) >>> >>> Firefox: Public support for reducing UA string information - “freezing >>> the User Agent string without any client hints—seems worth-prototyping” >>> (from >>> https://github.com/mozilla/standards-positions/issues/202#issuecomment-558294095 >>> ) >>> >>> Safari: Shipped to some extent. Safari has attempted to completely >>> freeze the UA string >>> <https://twitter.com/rmondello/status/943545865204989953?lang=en> in >>> the past, but somewhat reverted that decision >>> <https://bugs.webkit.org/show_bug.cgi?id=182629#c6>. Nowadays, their UA >>> string seems mostly frozen, with updates only to the browser version. >>> >>> Web developers: Mixed signals. Some positive comments on Twitter, >>> blink-dev, etc., as well as some negative sentiment. >>> >>> Experiment Summary >>> >>> This experiment is going to be a bit different from a normal Origin >>> Trial; the goal is less about gathering information on the design of a new >>> API than it is about enabling developers and administrators to test and >>> ensure compatibility with our proposed changes. This change represents a >>> large compat challenge with very subtle pitfalls and vast dependencies, >>> it’s incredibly important we give developers any opportunity to test >>> systems at every level. >>> >>> As for engaging with the trial itself, there will be two components >>> controlled by the same Origin Trial: >>> >>> 1. >>> >>> Reducing the information in the associated JS getters, if the Origin >>> Trial is enabled. >>> 2. >>> >>> A client hint that gets set when the Origin Trial is enabled, where >>> the client hint indicates to the origin that the User-Agent request >>> header >>> contains the reduced value. Because of the experimental nature of this >>> client hint, a valid Origin Trial token must be sent in the response >>> header >>> by the origin for the client hint to take effect or be stored (in order >>> to >>> prevent platform burn-in for this temporary client hint token). >>> >>> >>> During the process of conducting the Origin Trial, we may find that we >>> need to request an exception to the per-site (and possibly global) limits >>> imposed by Origin Trials. In practice, Origin Trials rarely exceed their >>> quota limits, but if necessary, there is time between when the limits have >>> been exceeded and the Origin Trial is turned off, where we can work with >>> the users on reducing their usage and/or lifting the limits. >>> >>> Please see the design document >>> <https://docs.google.com/document/d/1feIxK9S7oNgT2oGGebbxE9X0O-4wTKcsP_gRaY99tq4/edit#heading=h.2navvbygwxwb> >>> >>> describing the experiment for more information. >>> >>> Experiment Goals >>> >>> The goal of this trial is to enable developers to test how reducing the >>> User-Agent request header and the related navigator getters will affect >>> their systems and make sure they have all of the tools they need for an >>> effective migration to User Agent Client Hints >>> <https://web.dev/migrate-to-ua-ch/>. We hope that by providing >>> sufficient time to test and provide feedback we can validate our current >>> plans for UA Reduction and safely roll them out to the web at large. >>> >>> We will be relying heavily on user and developer feedback to understand >>> where breakage occurs, or where use cases are not accounted for. We will >>> create a GitHub repository as well as a public mailing list for gathering >>> feedback. When the OT is ready, we plan to publish developer guidance on >>> how to enroll and provide feedback. >>> >>> Experiment Timeline >>> >>> M101-M103 >>> >>> Reason this experiment is being extended >>> >>> We have a partner that would like to continue testing the fully reduced >>> UA string. Due to an issue in their experiment design, they weren't able to >>> launch the OT and collect any data. We would like to extend the OT by 3 >>> milestones, if possible. We believe the risks for burn-in don't apply, >>> because this OT just enables what we hope will be the default behavior in >>> the future. >>> >>> We are encouraged by the fact that no other OT participants provided >>> negative feedback, or reports of site breakage, so we feel like this >>> extension is pretty safe. >>> >>> Draft spec: https://compat.spec.whatwg.org/#ua-string-section >>> >>> TAG review: Closed <https://github.com/w3ctag/design-reviews/issues/640> >>> as “Satisfied with concerns” >>> >>> bit.ly/blink-signals requests: Firefox and Safari have already shipped >>> UA reduction in varying forms. >>> >>> Outreach for feedback from the spec community: N/A >>> >>> WPT tests: There are WPTs covering general UA string behavior but >>> nothing specific to UA reduction yet (until the various phases land in the >>> stable channel). >>> >>> Experiment Risks >>> >>> Despite the proposed changes being net-positive in terms of privacy, >>> there are some compat risks, as many sites have come to rely on the shape >>> of the User-Agent header and related JS interfaces. Site breakage can take >>> many forms, both obvious and non-obvious. However, since sites are in >>> control of the Origin-Trial and Accept-CH 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> >>> ? >>> >>> Not yet. >>> >>> Flag name >>> >>> #reduce-user-agent >>> >>> Tracking bug >>> >>> https://bugs.chromium.org/p/chromium/issues/detail?id=955620 >>> >>> https://bugs.chromium.org/p/chromium/issues/detail?id=1222742 >>> >>> Link to entry on the Chrome Platform Status >>> >>> https://chromestatus.com/feature/5704553745874944 >>> >>> -- You received this message because you are subscribed to the Google Groups "blink-dev" group. 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