Why is addContentLengthHeader false by default?


Hi there,

I’m wondering why addContentLengthHeader is false by default, when creating a new Slim project via:
composer create-project slim/slim-skeleton first-slim-app

It is also false in the very beginnig of the docs:

So, does it make performance overhead?
Or is it maybe buggy?

Actually, I need Content-Length on the client side, but only for certain requests. (I need this to be able to show the download progress).
So, should I optimize addContentLengthHeader, and only set it true for those requests really needing it?

Thank you very much!