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If we send two messages over the same html5 websocket a split millisecond apart from each other,
Is it theoretically possible for the messages to arrive in a different order than they were sent?
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Websocket client connections may drop due to intermittent network issue and when connections drop, messages will also be lost. In a pubsub system, publishers are decoupled from subscribers, so publishers hard to detect subscribers' drop or message loss.
Despite its obvious benefits, there remain some concerns with utilizing WebSockets for load balancing. For example, if a WebSocket-based app is running on two servers and the load balancer is distributing connections evenly across them, it won't distribute any of the existing traffic when a third server is added.
There is no guarantee of the successful delivery of a web socket message to the peer, but if the action of sending a message causes an error known to the container, the API throws it.
Short answer: No.
Long answer:
WebSocket runs over TCP, so on that level @EJP 's answer applies. WebSocket can be "intercepted" by intermediaries (like WS proxies): those are allowed to reorder WebSocket control frames (i.e. WS pings/pongs), but not message frames when no WebSocket extension is in place. If there is a neogiated extension in place that in principle allows reordering, then an intermediary may only do so if it understands the extension and the reordering rules that apply.
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It's not possible for them to arrive in your application out of order. Anything can happen on the network, but TCP will only present you the bytes in the order they were sent.
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