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webappsec-permissions-policy
A mechanism to selectively enable and disable browser features and APIs
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
This took a fair bit of investigation. I'm not convinced that it's the most well-documented header, in terms of the properties that you can set. Effectively, this is a list of values that determine which permissions are allowed for this website. Given I don't need access to location, camera, microphone or accelerometer. I did have issues finding consistent documentation on this one, so ended up having to combine the Feature-Policy documentation from MDN as well as the permissions policy examples from w3c.