Channels: channel_layer appears to time out

Hello,

I have a project that uses Channels as a worker queue, with a SyncConsumer that runs a heavy computation task. This works great.

I transitioned the project to have a 'task in process' page that opens a websocket and through the magic of channel's groups it gets pushed the computation updates as they happen. This works great.

I'm now transitioning the project to be a single-page-app that communicates via a websocket. Using `runserver`, this works great, the websocket stays open. However, the messages from the SyncConsumer stop after a few seconds. I've established that time is whatever the value of `websocket_handshake_timeout` is, but this doesn't make sense to me AFAIK as the channel_layer is independent from the JsonWebsocketConsumer instance, and the websocket is happily connected and still passing messages.

Any ideas? Is this a bug or am I doing something wrong? 

Thanks,

Toby

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