Cloudflare Workers ASGI adapter only consumes the first yielded chunk from async generators used in StreamingResponse.

[adewale]

The Cloudflare Workers ASGI adapter only consumes the first yielded chunk from async generators used in StreamingResponse. For R2 content spanning multiple ReadableStream chunks (anything over ~4 KB), the response is silently truncated.

See: https://github.com/adewale/python-workers-issues/tree/main/2-fastapi-r2-streaming for an example.

[ryanking13]

Thanks for the report. I can reproduce the issue with your example and it is a bug in our ASGI adpator. We are not handling the streaming data correctly.