Re: [push-api] events should be part of PushSubscription (#104)

At risk of derailing this thread...  The major drawback is the abuse of HTTP.

SSE assumes that there is a clean channel between the origin and the client, without any intermediary that could alter the timing of packet delivery.  That assumption has been proven false in a great many deployments.

For instance, SSE fails where there is a virus-scanning intermediary.  Those buffer HTTP entities so that they can verify that they are clean.

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