diff --git a/examples/dag.go b/examples/dag.go
index b3c0c20..08c91c0 100644
--- a/examples/dag.go
+++ b/examples/dag.go
@@ -4,15 +4,17 @@ import (
 	"context"
 	"encoding/json"
 	"fmt"
-	"log"
-	"time"
-
 	"github.com/oarkflow/mq"
 	"github.com/oarkflow/mq/dag"
+	"io"
+	"log"
+	"net/http"
 )
 
+var d *dag.DAG
+
 func main() {
-	d := dag.New()
+	d = dag.New()
 	d.AddNode("queue1", func(ctx context.Context, task mq.Task) mq.Result {
 		return mq.Result{Payload: task.Payload, MessageID: task.ID}
 	})
@@ -39,18 +41,44 @@ func main() {
 		bt, _ := json.Marshal(payload)
 		return mq.Result{Payload: bt, MessageID: task.ID}
 	})
-
 	d.AddEdge("queue1", "queue2")
 	d.AddLoop("queue2", "queue3")
 	d.AddEdge("queue2", "queue4")
 	go func() {
-		time.Sleep(2 * time.Second)
-		finalResult := d.Send([]byte(`[{"user_id": 1}, {"user_id": 2}]`))
-		log.Printf("Result received: %s %s", finalResult.MessageID, string(finalResult.Payload))
+		err := d.Start(context.TODO())
+		if err != nil {
+			panic(err)
+		}
 	}()
-
-	err := d.Start(context.TODO())
-	if err != nil {
-		panic(err)
-	}
+	http.HandleFunc("/send-task", sendTaskHandler)
+	log.Println("HTTP server started on http://localhost:8083")
+	log.Fatal(http.ListenAndServe(":8083", nil))
+}
+func sendTaskHandler(w http.ResponseWriter, r *http.Request) {
+	if r.Method != http.MethodPost {
+		http.Error(w, "Invalid request method", http.StatusMethodNotAllowed)
+		return
+	}
+	var payload []byte
+	if r.Body != nil {
+		defer r.Body.Close()
+		var err error
+		payload, err = io.ReadAll(r.Body)
+		if err != nil {
+			http.Error(w, "Failed to read request body", http.StatusBadRequest)
+			return
+		}
+	} else {
+		http.Error(w, "Empty request body", http.StatusBadRequest)
+		return
+	}
+	finalResult := d.Send(payload)
+	w.Header().Set("Content-Type", "application/json")
+	result := map[string]any{
+		"message_id": finalResult.MessageID,
+		"payload":    string(finalResult.Payload),
+		"error":      finalResult.Error,
+	}
+
+	json.NewEncoder(w).Encode(result)
 }
diff --git a/options.go b/options.go
index cf23d7c..207f04d 100644
--- a/options.go
+++ b/options.go
@@ -20,7 +20,7 @@ type Options struct {
 
 func defaultOptions() Options {
 	return Options{
-		syncMode:      true,
+		syncMode:      false,
 		brokerAddr:    ":8080",
 		maxRetries:    5,
 		initialDelay:  2 * time.Second,