ImportError: cannot import name 'LifespanFailure' from 'hypercorn.utils' about hypercorn

[pgjones]

I didn't think LifespanFailure would be used outside of the Hypercorn code directly - I'd like to learn about your usage.

It is a renaming, I'll add it to the changelog.

[adam-pawluczuk]

So basically what I have is this:

from hypercorn.utils import LifespanFailure

try:
    await self.app(<some params>)
except LifespanFailure:
    pass

It is being used like this in one of the middlewares.

[pgjones]

I'm not sure that these errors should leak out to the middleware - I guess this is an app that doesn't support lifespans?

[adam-pawluczuk]

Yes, that makes sense. So it looks like it could be the fault on the application side then. Thank you!

[pgjones]

Thinking about this some more, I think the specification allows for any Exception subclass to be raised - so I don't think your middleware should rely on it being a LifespanFailureError.