Squid 4 started to send ICAP request 1 minute after boot.
2021/03/12 16:24:01.628| essential ICAP service is down after an options fetch failure: icap://icap4:1344 [down,!opt]
2021/03/12 16:25:01.713| essential ICAP service is up: icap://icap4:1344 [up]
Squid 5 send no ICAP request.
2021/03/12 07:23:31.545| essential ICAP service is down after an options fetch failure: icap://icap5:1344 [down,!opt]
current master transaction: master53
Squid 4 started to send ICAP request 1 minute after boot.
Squid 5 send no ICAP request.
Even after 10 minutes, there were no progress.