https randomly failing with proxies

[Mzack9999]

httpx version:

master/main and dev

Current Behavior:

https urls are failing silently in certain cases while using proxy

Expected Behavior:

https protocol working correctly with proxies

Steps To Reproduce:

$ echo https://192.168.1.1 | go run . -proxy http://localhost:8080 -v
...
[DBG] Failed 'https://192.168.1.1': remote error: tls: user canceled