Its being added server side. YT does a fetch to https://www.youtube.com/youtubei... | Hacker News

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rasz on July 30, 2021 | parent | context | favorite | on: Ask HN: Why is YouTube adding “&pp=sAQA” to video ...

Its being added server side. YT does a fetch to https://www.youtube.com/youtubei/v1/browse?key=xxxxx and the response is subscriptions list, all already with &pp=sAQA attached

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