use http2 and proxies，timeout not work

[Boris-code]

trafficstars

code

with httpx.Client(
    headers=headers,
    http2=True,
    proxies=proxies,
    timeout=10,
) as client:
    log.debug("step1")
    r = client.get(url, timeout=10)
    log.debug("step2")

the code stop in step1 for a long time