Nothing in this server knows what a fabric is. It listens on loopback and answers HTTP. Everything below was told to it by the forward plane, which ended your TLS with the certificate for the name you used and proxied the request here.
playground.www.net.fab.balcony.codes4my1zqp3m7idqd3nfmb6xae7rcmmyf7sgcmkpdyaq3xpoaa6ksuygrp grp/p2p-exchange/anchor keys/4my1zqp3m7idqd3nfmb6xae7rcmmyf7sgcmkpdyaq3xpoaa6ksuy net net/lookup net/relayThe bind that carries it is one line: fab node bind flow:<name>:443 serve web:127.0.0.1:19910.