Re: [Webpush] Use Case related to subscription sets

Benjamin Bangert <> Wed, 18 November 2015 18:21 UTC

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Date: Wed, 18 Nov 2015 10:20:57 -0800
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From: Benjamin Bangert <>
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Subject: Re: [Webpush] Use Case related to subscription sets
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I'm not sure any changes would be needed as is. If a Push Server is
limiting the concurrent streams, the proxy could just open several
connections, one for each device its proxying for that devices subscription

When the device disconnects from the proxy, it would shut down that Push
Service connection, and the device could query the Push Service directly.

We currently field many connections from single IP's (proxies), and don't
plan on enforcing connection limits for a single IP since mobile proxies
are quite common.


On Wed, Nov 18, 2015 at 2:19 AM, Hervé Ruellan <>

> Hi all,
> We, at Canon, have a use case that is dependent on the rules relating
> subscriptions and subscription sets.
> In this use case, a device (e.g. a camera) connects to a push-server
> through a proxy (e.g. a mobile phone). The communication between the camera
> and the proxy uses an appropriate protocol (most possibly not HTTP). A
> notification goes from the push-server to the proxy (acting as a
> user-agent) through WebPush, then from the proxy to the device through the
> appropriate protocol.
> We plan to use the same proxy for several devices. We would like to allow
> a device to change from a proxy to another seamlessly (e.g. going from the
> mobile phone to a PC when coming home). When a device moves from a proxy to
> another, we would like it to keep the same subscription. This means that
> each device would need to have its own subscription set to contain its
> subscription (or subscriptions).
> Supporting this use case means that a client, here the proxy, is allowed
> to have several subscription sets. However, this number would be quite
> limited as we think only a few devices would connect through the same proxy.
> This scenario is of importance for us, and we would like the WG to take it
> into account in the definition of subscription sets.
> Cheers,
> Hervé Ruellan
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