Module 11 Summary

What this module established

Background tasks are best-effort, in-process and not retried - use them only where losing the work is acceptable. Must-happen work needs a queue; must-happen-before-responding stays inline.

Carry forward

• Reject uploads on declared type first, then enforce size while reading. Checking afterwards means you already accepted the file.
• Never make a blocking call inside async def. If the library has no async client, declare the handler def.
• Streaming keeps memory flat and commits the status code before the body, so validate up front and signal truncation.

Before moving on

Move on when no blocking call remains in an async handler and every piece of deferred work is classified with a destination.

Mark complete