Should frameworks change scope values?

[pgjones]

See pgjones/hypercorn#75 where Starlette changes the scope["path"], should ASGI frameworks do this or consider the existing values immutable? (I don't think the specification says - I may work around by passing a copy to the framework)

[Kludex]

Maybe relevant: encode/starlette#1336.

[andrewgodwin]

Yeah, you're not really meant to change the value of path, I feel - since it's meant to always have root_path at the start. I'm not going to go all out and say something absolutely shouldn't, but I think if it's modified then root_path has to be included in that to make things make sense.

[Kludex]

We'll fix Starlette. It's not Hypercorn's fault. Uvicorn has the same behavior as Hypercorn. 🙏

[adriangb]

Related: Starlette at least mutates scope even when the spec clearly states "when middleware is modifying the scope, it should make a copy of the scope object before mutating it and passing it to the inner application" 🤷🏻‍♂️