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US WebSub
https://www.w3.org/TR/websub

… 2017 W3C Process Document 1. Definitions Topic An HTTP [ RFC7230 ] (or HTTPS [ RFC2818 ]) resource URL. The unit to which one can subscribe to changes. Hub ("the hub") The server (URL [ URL ]) which implements both sides of this protocol. Any hub MAY implement its own policies o…