Note: WebSockets are not actually HTTP, but I’m sticking it here anyway

https://developer.mozilla.org/en-US/docs/Web/API/WebSockets_API

https://www.pubnub.com/blog/websockets-alternatives-for-realtime-communication/

https://docs.mulesoft.com/websockets-connector/latest/

https://developer.mulesoft.com/tutorials-and-howtos/connectors/how-to-create-realtime-charts-using-websockets-connector

https://blogs.mulesoft.com/dev-guides/api-connectors-templates/websockets-connector/

https://docs.mulesoft.com/websockets-connector/1.0/websockets-connector-examples