I create a asyncClient by async with httpx.AsyncClient(proxies=proxies,timeout=2.0)as client: then I send a request

print("get cookie res start", f'xid{xid}')  
cookieres = await client.get(url, headers=headers)  
print("get cookie res ",f'xid{xid}',t-time.time())

sometimes the requests will cost more than 2s

get cookie res xid0 -4.54197096824646

and sometimes I have to wait several minutes and get an error like httpx.readError