Este exemplo demonstra como substituir alguns blocos no evento, por exemplo "post com id 1 alterado" ( post-1-changed ) e acionar para carregar conteúdo via solicitação ajax em "chatter" evento.

package main

import (
    "fmt"
    "net/http"
    "time"

    "github.com/r3labs/sse/v2"
)

func main() {
    server := sse.New()
    _ = server.CreateStream("messages")

    mux := http.NewServeMux()
    mux.HandleFunc("/events", func(w http.ResponseWriter, r *http.Request) {

        // la security
        token := r.URL.Query().Get("token")
        if token != "secret" {
            http.Error(w, "invalid token", http.StatusUnauthorized)
            return
        }
        go func() {
            Hello from chat room`))
    })

    mux.HandleFunc("/index", func(w http.ResponseWriter, r *http.Request) {
        w.Write([]byte(`
        
        
        
        
        
        
        

            
one
        
        

            
one
        
        

            
one
        
        

            
one
        
        

            

                chat body reloaded
            
        
        
        `))
    })

    go func() {
        i := 0
        for {
            i  
            time.Sleep(1 * time.Second)

            server.TryPublish("messages", &sse.Event{
                ID:    []byte(fmt.Sprintf("%d", i)),
                Event: []byte("post-1-changed"),
                Data:  []byte(`
Hello from sse `   fmt.Sprintf("%d", i)   `
`),
            })

            server.TryPublish("messages", &sse.Event{
                ID:    []byte(fmt.Sprintf("%d", i)),
                Event: []byte("notifications"),
                Data:  []byte(`
Hello from post 2 sse `   fmt.Sprintf("%d", i)   `
`),
            })

            server.TryPublish("messages", &sse.Event{
                ID:    []byte(fmt.Sprintf("%d", i)),
                Event: []byte("chatter"),
                Data:  []byte(`
`),
            })
            server.EventTTL = 5 * time.Second
        }
    }()

    http.ListenAndServe(":9999", mux)
}