A ring defines only a request-response cycle, no no push in Ring SPEC . You can write a network ring adapter, but it will allow you to respond to events occurring in the browser, without the possibility of notifying the browser from the server. But you can still do it directly through the webbit api, but not through the ring middleware.
You can read the same on the aleph page:
The Aleph corresponds to the interface described by the Ring, with one small difference: the request and response are decoupled.
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