Re: [w3ctag/design-reviews] Partial freezing of the User-Agent string (#467)

Hi @yoavweiss 

"I want us to try and disincentivize negative behavior related to that"

Did you consider removing the installation and Google-specific tracking headers (x-client-data) that Google Chrome is sending to Google properties ?

Example:
https://www.youtube.com - in network headers, look for x-client-data

Now, go to https://ad.doubleclick.net/abc - and your browser also sends this magic x-client-data.

It's a unique ID to track a specific Chrome instance across all Google properties.

Really curious about your opinion, especially after the GDPR explicitly forbidding such tracking.
Moreover, it doesn't make sense to anonymise user-agent if you have such backdoor.

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