I've been refreshing the page to close the socket which results in the server logging:

{
  "level": "info",
  "ts": 1611709408.9634256,
  "caller": "service/rtcservice.go:110",
  "msg": "WS connection closed",
  "participant": "WzEsICJwdWJsaWMiLCAidXNlciIsICIweEZGQzgwYmQyQTQxM2YzN0UxMjVEMzlDMjgxQ2M4NUI4OGRjZWJGMjAiXQ=="
}