Data payload too big error

[augustas.volbekas]

Thank you @ianb

Your answer (and links) completely answer my question.

I will leave some links here if anyone else also encounter this problem.

Limits:

Anvil Server disconnects when large amounts of data are passed back

Hi @jsardonicus How do you measure that file size? Are you returning it as dicts and lists from the uplink function, or as a string, or in a Media object? Serialised data returned from uplink or server modules currently has a size limit of 4MB, excluding media (so, if you want to send more than 4MB of data, try sending as Media) - but it looks like your payload is well below that size, so something funny is going on… Can you share the data you’re sending as an email attachment to support@anvi…

Solution

Anvil Server disconnects when large amounts of data are passed back

Further investigation revealed that the data was actually 4.9 MB rather than 109 KB, which explains why the transfer was failing. Until we have support for sending larger Python objects, the workaround is to send as a Media object: return anvil.BlobMedia("application/json", json.dumps(data)) And then decode the JSON at the other end: data = json.loads(returned_media.get_bytes())