Interesting, nice find! Unfortunately flask_compress.__version__ doesn't seem to exist until v1.10, which is probably why get_distribution was used in the first place.

I'd suggest a further fallback for the AttributeError: module 'flask_compress' has no attribute '__version__' you'll get before v1.10.0 that assumes it's maybe parse_version("1.9.0") (all that matters is >=1.6.0)

Another thing to note though: the default for compress was changed to False in Dash 2.0 (on the theory that for local dev this compression just slows things down, and for production deployments this is normally handled at a lower level like gunicorn). So this whole issue is irrelevant for most people as long as it doesn't error.

So if you're feeling adventurous, we could probably take this this whole block, plus the original from flask_compress import Compress AND the block where we use this to modify the server config:

and move it into the block where we actually turn compression on, so the only people who will hit any of this code will be those who explicitly enable compression, everyone else won't even import the module.

If we do this we'll just want to manually check that you actually do get gzip compression with current flask_compress