Background tasks never being called after updating

[WardPearce]

Recently after making some minor changes to my project, I found that my workflow for my unit tests stopped passing but the tests on my local machine still passed. After upgrading Starlette to 0.20.1 on my local machine the unit tests began to fail.

After doing a bit of digging, it appears none of my background tasks are running anymore. When replacing the background tasks with just the function they call in the background, the unit tests past.

This is also happening outside of unit tests too, when spinning up my development environment locally. The API doesn't function as it should.

Also after downgrading back to 0.20.0 everything works as expected.

• Source code
• Python version: 3.10.4
• Starlette version: 0.20.1

[Kludex]

Do you use BaseHTTPMiddleware?

[WardPearce]

Odd, yea interesting that they're running on 0.20.0

[Kludex]

Can you add an sleep of 1 sec on the background task and see if it's still the case?

[WardPearce]

Sure, I'll do that tmrw. Spent today porting my project over to FastAPI.

[Kludex]

Cool! If you need something, just in case, we have a discord server for FastAPI: https://discord.com/invite/VQjSZaeJmf :)

[WardPearce]

Awesome thanks, FastAPI is great. Shame it doesn't have class based routes. Often the reasons why I stick with starlette for smaller projects.