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sse.go
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sse.go
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package main
import (
"fmt"
"log"
"net/http"
"time"
)
func sseHandler(w http.ResponseWriter, r *http.Request) {
// 设置响应头为 Server-Sent Events 标准格式
w.Header().Set("Content-Type", "text/event-stream")
w.Header().Set("Cache-Control", "no-cache")
w.Header().Set("Connection", "keep-alive")
ctx := r.Context() // 获取请求的上下文
// 模拟数据流,定时发送消息
for i := 0; ; i++ {
select {
case <-ctx.Done(): // 检查上下文是否被取消
log.Println("Client disconnected")
return
default:
// 构造消息
msg := fmt.Sprintf("data: Message %d\n\n", i)
// 发送消息
_, err := w.Write([]byte(msg))
if err != nil {
// 如果无法发送消息,比如客户端断开连接,就结束循环
log.Printf("Error writing to client: %v", err)
break
}
// 刷新缓冲区,确保消息立即发送
if f, ok := w.(http.Flusher); ok {
f.Flush()
}
// 等待一段时间再发送下一条消息
time.Sleep(2 * time.Second)
}
}
}
func main() {
http.HandleFunc("/events", sseHandler)
log.Println("Server started on :8080")
err := http.ListenAndServe(":8080", nil)
if err != nil {
log.Fatalf("Server failed to start: %v", err)
}
}