prevent caching of the m3u response

fe/http.go

@@ -76,6 +76,8 @@ func (h *HttpRedirector) serveRelay(w http.ResponseWriter, r *http.Request) {
 	m3u := fmt.Sprintf("http://%s%s\n", relayAddr, mount.Name)
 	w.Header().Set("Content-Length", strconv.Itoa(len(m3u)))
 	w.Header().Set("Content-Type", "audio/x-mpegurl")
+	w.Header().Set("Expires", "-1")
+	w.Header().Set("Cache-Control", "private, max-age=0")
 	io.WriteString(w, m3u)
 }