Channels: about max message size

[Chris]

I use Channels & websockets for my webapp's "export data" functionality, since it can take a long time to generate the file (more than 30 seconds). In general this works fine, even for large downloads (several MB), but I have seen several cases on Heroku where the browser never receives the message with the file, even though debugging shows that JsonWebsocketConsumer.send was called as expected.

I found this Github issue that says the message limit is 1 MB (or maybe 256 kb). My questions:

- Where is this limit defined? I searched the source of Channels and Daphne. I'm trying to figure out where the failure is happening -- in the worker, Daphne, or Redis.

- What happens if the limit is exceeded? Is an exception raised? (Because in my case it fails silently.)

- Is there really a 1 MB limit? Because it seems I have been able to send files larger than that using channels/asgi_redis (unfortunately I'm still on channels 0.17.3, can't upgrade yet because of a Twisted bug).

Thanks!

[Andrew Godwin]

Hmm, it's possible the 0.x series didn't have response streaming for files so there'd be a limit, but I honestly can't remember, that was years ago. There's really not much I can do other than recommending an upgrade to something vaguely recent.

Also make sure Heroku is not cutting you off with a request timeout or something.

Andrew

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[Chris]

Thank you Andrew. Hope I can upgrade soon to get the Channels 2.X awesomeness :)