Bidirectional messaging over HTTP, one concrete implementation based on the bidi-web semantics.
Platform neutral Java client (API and protocol spec): client/java/bidiweb/webchannel
Closure JS API spec: https://github.com/google/closure-library/blob/master/closure/goog/labs/net/webchannel.js
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2016 OSCON Talk: Scalable bidirectional communication over the Web
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2018 O’Reilly Software Architecture Conference: Embracing stateful client-server communication in the era of serverless functions