Websockets - Guaranteed full Messages?

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When an "onmessage" event fires in the web socket protocol are you guaranteed the full message or is it more like a straight TCP connection where you buffer the data first and then try to extract packets.

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There is protocol level support for fragmented messages and streaming. But this behavior is not represented in the current Javascript API, (reference). So yes, if you receive a message, it is indeed an entire message even if it was sent as many fragments.