In the example below, there are two active sessions. The first is a TCP connection and the second is a UNIX socket stream (the Runtime API connection itself):
$ echo "show sess" | sudo socat stdio /var/run/hapee-2.1/hapee-lb.sock
0x7fa44c02a470: proto=tcpv4 src=192.168.50.1:62423 fe=fe_main be=websocket srv=server1 ts=00 age=16s calls=5 rate=0 cpu=0 lat=0 rq[f=8848000h,i=0,an=00h,rx=59m55s,wx=,ax=] rp[f=88048202h,i=0,an=00h,rx=59m55s,wx=,ax=] s0=[8,200008h,fd=19,ex=] s1=[8,200118h,fd=20,ex=] exp=59m50s
0x55e4db986ba0: proto=unix_stream src=unix:1 fe=GLOBAL be=<NONE> srv=<none> ts=00 age=0s calls=2 rate=2 cpu=0 lat=0 rq[f=c4c220h,i=0,an=00h,rx=,wx=,ax=] rp[f=80008002h,i=0,an=00h,rx=,wx=,ax=] s0=[8,280008h,fd=23,ex=] s1=[8,204018h,fd=-1,ex=] exp=10m