ASA#show conn
71590 in use, 80688 most used
Network Processor 1 connections
UDP outside 10.10.10.1:33222 inside 192.168.1.1:23445 idle 0:02:27 Bytes 149
FLAGS -
TCP outside 10.10.10.1:33222 inside 192.168.1.1:23445 idle 0:00:01 Bytes 8378 FLAGS - UOI
ASA#sh res usa
Resource Current Peak Limit Denied Context
SSH 1 2 5 0 context1
Syslogs [rate] 4 9400 9400 608779 context1
Conns 19471 80688 80000 0 context1
Xlates 69659 90088 56901 0 context1
Hosts 62848 85442 56901 0 context1
Conns [rate] 228 27689 66600 0 context1
Syslogs [rate] 0 10 00 956 test
Conns 4 380 2000 0 test
Xlates 21 22 242 0 test
Hosts 21 22 242 0 test
Syslogs [rate] 0 10 00 956 production
Conns 4 380 2000 0 production
Xlates 21 22 242 0 production
Hosts 21 22 242 0 production
Reason for this is that HTTP connections are not replicated by default. If needed, HTTP sessions replication can be turned on by issuing failover replication http command.
hostname(config)# failover replication http