golang server-sent-event implementation invoke net::ERR_HTTP2_PROTOCOL_ERROR 200 (OK)

[dusky onyx]

Hi! I just implemented this tutorial for sse on go: https://www.kelche.co/blog/go/server-sent-events/. When event comes my client just write it in the console. it works but sometimes i see errors and idk what was the cause (see screenshot).

PS: i use tls connection, but all certs is valid

the code:
server side

func (s *Service) SSE(w http.ResponseWriter, r *http.Request) {
    w.Header().Set("Access-Control-Allow-Origin", "*")
    w.Header().Set("Cache-Control", "no-cache")
    w.Header().Set("Connection", "keep-alive")
    w.Header().Set("Content-Type", "text/event-stream")

    // send a random number every 2 seconds
    for {
        rand.Seed(time.Now().UnixNano())
        fmt.Fprintf(w, "data: %d \n\n", rand.Intn(100))
        w.(http.Flusher).Flush()
        time.Sleep(2 * time.Second)
    }
}

client

const onLoaded = () => {
        let eventSource = new EventSource("/events");
        eventSource.onmessage = function(event) {
            console.log(`New event:`, event.data);
        };
}

[dusky onyx]

i see it caused by writeTimeout of the server

[idle mortar]

https://developer.mozilla.org/en-US/docs/Web/API/Server-sent_events/Using_server-sent_events

[idle mortar]

i tried to run this code on my machine, but i do not get such errors