diff --git a/internal/goman/lib_test.go b/internal/goman/lib_test.go
index 11358d1..2b7616f 100644
--- a/internal/goman/lib_test.go
+++ b/internal/goman/lib_test.go
@@ -1,27 +1,28 @@
 // Copyright 2021 Liuxiangchao iwind.liu@gmail.com. All rights reserved.
 
-package goman
+package goman_test
 
 import (
+	"github.com/TeaOSLab/EdgeNode/internal/goman"
 	"testing"
 	"time"
 )
 
 func TestNew(t *testing.T) {
-	New(func() {
+	goman.New(func() {
 		t.Log("Hello")
 
-		t.Log(List())
+		t.Log(goman.List())
 	})
 
 	time.Sleep(1 * time.Second)
-	t.Log(List())
+	t.Log(goman.List())
 
 	time.Sleep(1 * time.Second)
 }
 
 func TestNewWithArgs(t *testing.T) {
-	NewWithArgs(func(args ...interface{}) {
+	goman.NewWithArgs(func(args ...interface{}) {
 		t.Log(args[0], args[1])
 	}, 1, 2)
 	time.Sleep(1 * time.Second)
diff --git a/internal/goman/task_group.go b/internal/goman/task_group.go
new file mode 100644
index 0000000..7c9493b
--- /dev/null
+++ b/internal/goman/task_group.go
@@ -0,0 +1,52 @@
+// Copyright 2023 GoEdge CDN goedge.cdn@gmail.com. All rights reserved. Official site: https://goedge.cn .
+
+package goman
+
+import (
+	"github.com/TeaOSLab/EdgeNode/internal/zero"
+	"runtime"
+	"sync"
+)
+
+type TaskGroup struct {
+	semi   chan zero.Zero
+	wg     *sync.WaitGroup
+	locker *sync.RWMutex
+}
+
+func NewTaskGroup() *TaskGroup {
+	var concurrent = runtime.NumCPU()
+	if concurrent <= 1 {
+		concurrent = 2
+	}
+	return &TaskGroup{
+		semi:   make(chan zero.Zero, concurrent),
+		wg:     &sync.WaitGroup{},
+		locker: &sync.RWMutex{},
+	}
+}
+
+func (this *TaskGroup) Run(f func()) {
+	this.wg.Add(1)
+	go func() {
+		defer this.wg.Done()
+
+		this.semi <- zero.Zero{}
+
+		f()
+
+		<-this.semi
+	}()
+}
+
+func (this *TaskGroup) Wait() {
+	this.wg.Wait()
+}
+
+func (this *TaskGroup) Lock() {
+	this.locker.Lock()
+}
+
+func (this *TaskGroup) Unlock() {
+	this.locker.Unlock()
+}
diff --git a/internal/goman/task_group_test.go b/internal/goman/task_group_test.go
new file mode 100644
index 0000000..99a435f
--- /dev/null
+++ b/internal/goman/task_group_test.go
@@ -0,0 +1,30 @@
+// Copyright 2023 GoEdge CDN goedge.cdn@gmail.com. All rights reserved. Official site: https://goedge.cn .
+
+package goman_test
+
+import (
+	"github.com/TeaOSLab/EdgeNode/internal/goman"
+	"runtime"
+	"testing"
+)
+
+func TestNewTaskGroup(t *testing.T) {
+	var group = goman.NewTaskGroup()
+	var m = map[int]bool{}
+
+	for i := 0; i < runtime.NumCPU()*2; i++ {
+		var index = i
+		group.Run(func() {
+			t.Log("task", index)
+
+			group.Lock()
+			_, ok := m[index]
+			if ok {
+				t.Error("duplicated:", index)
+			}
+			m[index] = true
+			group.Unlock()
+		})
+	}
+	group.Wait()
+}
diff --git a/internal/nodes/http_cache_task_manager.go b/internal/nodes/http_cache_task_manager.go
index bdaf5de..62e0d13 100644
--- a/internal/nodes/http_cache_task_manager.go
+++ b/internal/nodes/http_cache_task_manager.go
@@ -19,6 +19,7 @@ import (
 	"io"
 	"net"
 	"net/http"
+	"os"
 	"regexp"
 	"strings"
 	"time"
@@ -131,21 +132,29 @@ func (this *HTTPCacheTaskManager) Loop() error {
 
 	var pbResults = []*pb.UpdateHTTPCacheTaskKeysStatusRequest_KeyResult{}
 
+	var taskGroup = goman.NewTaskGroup()
 	for _, key := range keys {
-		err = this.processKey(key)
+		var taskKey = key
+		taskGroup.Run(func() {
+			processErr := this.processKey(taskKey)
+			var pbResult = &pb.UpdateHTTPCacheTaskKeysStatusRequest_KeyResult{
+				Id:            taskKey.Id,
+				NodeClusterId: taskKey.NodeClusterId,
+				Error:         "",
+			}
 
-		var pbResult = &pb.UpdateHTTPCacheTaskKeysStatusRequest_KeyResult{
-			Id:            key.Id,
-			NodeClusterId: key.NodeClusterId,
-			Error:         "",
-		}
+			if processErr != nil {
+				pbResult.Error = processErr.Error()
+			}
 
-		if err != nil {
-			pbResult.Error = err.Error()
-		}
-		pbResults = append(pbResults, pbResult)
+			taskGroup.Lock()
+			pbResults = append(pbResults, pbResult)
+			taskGroup.Unlock()
+		})
 	}
 
+	taskGroup.Wait()
+
 	_, err = rpcClient.HTTPCacheTaskKeyRPC.UpdateHTTPCacheTaskKeysStatus(rpcClient.Context(), &pb.UpdateHTTPCacheTaskKeysStatusRequest{KeyResults: pbResults})
 	if err != nil {
 		return err
@@ -242,6 +251,7 @@ func (this *HTTPCacheTaskManager) fetchKey(key *pb.HTTPCacheTaskKey) error {
 	req.Header.Set("Accept-Encoding", "gzip, deflate, br")
 	resp, err := this.httpClient.Do(req)
 	if err != nil {
+		err = this.simplifyErr(err)
 		return errors.New("request failed: " + fullKey + ": " + err.Error())
 	}
 
@@ -249,13 +259,32 @@ func (this *HTTPCacheTaskManager) fetchKey(key *pb.HTTPCacheTaskKey) error {
 		_ = resp.Body.Close()
 	}()
 
-	// 读取内容，以便于生成缓存
-	_, _ = io.Copy(io.Discard, resp.Body)
-
 	// 处理502
 	if resp.StatusCode == http.StatusBadGateway {
 		return errors.New("read origin site timeout")
 	}
 
+	// 读取内容，以便于生成缓存
+	_, err = io.Copy(io.Discard, resp.Body)
+	if err != nil {
+		if err != io.EOF {
+			err = this.simplifyErr(err)
+			return errors.New("request failed: " + fullKey + ": " + err.Error())
+		} else {
+			err = nil
+		}
+	}
+
 	return nil
 }
+
+func (this *HTTPCacheTaskManager) simplifyErr(err error) error {
+	if err == nil {
+		return nil
+	}
+	if os.IsTimeout(err) {
+		return errors.New("timeout to read origin site")
+	}
+
+	return err
+}