![]() Send an Accept-CH header in your HTTP response that does not include Sec-CH-UA-Full. ![]() Subsequent request headers containing the full User-Agent string should look like: # How do I stop participating in the User-Agent Reduction deprecation trial?Īt any given point in time during the trial, you can stop participating and receive the reduced User-Agent string. The initial response's headers containing the origin-trial token should look like: ![]() The Sec-CH-UA-Full header is set to ?1.An easy way to tell is that the Chrome minor version string should not be 0.0.0. It shouldn't contain any of the reduced values (found in the list of samples of reduced User-Agent strings). The User-Agent header contains the full version.To validate that the origin trial is working, examine the request headers and ensure the following: # How do I validate that the trial is working? See for a demonstration of the trial (along with the source code). The standard advice for third-party origin trials applies. Note: a third-party embed can register and opt in to the trial without requiring the top-level site to delegate permission via Permissions Policy or. Load your website in Chrome 100 (or later) and continue receiving the full User-Agent string. It's not possible to delegate to all third-party domains via * in the meta tag.To allow a named list of third-party domains, add.Add an Accept-CH meta tag with the third-party domains that should receive the full User-Agent string (only in Chrome 100 and above).To allow a named list of third-party domains, add Permissions-Policy: ch-ua-full=(self "").To allow all third-party domains, add Permissions-Policy: ch-ua-full=*.Add a Permissions-Policy header with the third-party domains that should receive the full User-Agent string.You can allow full User-Agent string access to third-party domains by one of the following two options: Failure to extend third-party domains access to the full User-Agent string will block their full User-Agent string access regardless of their own reduction deprecation trial registration. If the full User-Agent string is critical on first request add Critical-CH: Sec-CH-UA-Full to your HTTP response header, in addition to the Accept-CH and Origin-Trial headers.įor participants joining the reduction deprecation trial we suggest allowing all third-party domains access to the full User-Agent string. Setting Accept-CH will only cause the full User-Agent string to be sent on subsequent requests to the origin. contains the token you got when registering for the origin trial.Īdd Accept-CH: Sec-CH-UA-Full to your HTTP response header. Once you've registered for the trial, update your HTTP response headers with the following:Īdd Origin-Trial: to your HTTP response header. If you are a third-party registering please check 'Third-party matching'. To register for the origin trial and get a token for your domains, visit the User Agent Reduction deprecation trial page. # How do I participate in the User-Agent Reduction deprecation trial? # Register for the trial The intent is to expire this deprecation trial once the User-Agent Reduction rollout is complete. Sites should still audit their usage of the User-Agent header and related APIs, and if needed prepare to migrate to User-Agent Client Hints before the deprecation trial expires. The navigator.appVersion Javascript getter.# What does this mean for web developers?īy enrolling in the deprecation trial, sites will continue to receive the full UA string in erAgent and non-reduced values in the related atform and navigator.appVersion JavaScript getters: If you have feedback to share or you encounter any issues throughout this trial let us know in the UA Reduction GitHub repository. If you would like to test the origin trial on Chrome 100 Beta before it launches to the stable channel, be sure to register and test before the release date for Chrome 100 ( currently scheduled for March 31st, 2022).īelow is an overview of the deprecation trial and what to expect. It will allow sites to receive the full User-Agent string ahead of the Chrome 101 release, where the minor version string will be reduced. The registration for the deprecation trial will begin with the Chrome 100 Beta. Sites that haven't had time to migrate away from using the reduced User-Agent string and move toward User-Agent Client Hints can take part in a deprecation trial to continue receiving the full User-Agent string. Starting from Chrome 101, the information available in the User-Agent (UA) string will be reduced using a phased approach.
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