event: progress
id: 0
data: {"percent":0}

event: progress
id: 25
data: {"percent":25}

event: progress
id: 50
data: {"percent":50}

event: progress
id: 75
data: {"percent":75}

event: progress
id: 100
data: {"percent":100}

event: done
id: done
data: {"ok":true}