client hangs on 404 with some arbitrary json payload

[Pavel-Husakouski]

Looks like it is not enough just to look at 204 :-) 404 causes the infinite look so as any other except 204

 // HTTP 204 means "close the connection, no more data will be sent"
    if (status === 204) {
      onDisconnect()
      close()
      return
    }