fix header

main.go

@@ -145,6 +145,7 @@ func main() {
 		header.Set("Content-Type", "text/event-stream; charset=utf-8")
 		header.Set("Cache-Control", "no-cache")
 		header.Set("Connection", "keep-alive")
+		header.Set("Content-Encoding", "none")
 
 		c.Status(http.StatusOK)
 		c.Writer.WriteHeaderNow()