The basis of httpx is not very good at all.

I think that it owes its success to be first "port" of python requests to support async, that was a strong need.

But otherwise it is bad: API is not that great, performance is not that great, tweaking is not that great, and the maintainer mindset is not that great also.
For the last point, few points were referenced in the article, but it can easily put your production project to suddenly break in a bad way without valid reason.

Without being perfect, I would advise everyone to switch to Aiohttp.