diff --git a/internal/caches/errors.go b/internal/caches/errors.go
index 0fb8e75..4656117 100644
--- a/internal/caches/errors.go
+++ b/internal/caches/errors.go
@@ -34,16 +34,14 @@ func CanIgnoreErr(err error) bool {
 	if err == nil {
 		return true
 	}
-	if err == ErrFileIsWriting ||
-		err == ErrEntityTooLarge ||
-		err == ErrWritingUnavailable ||
-		err == ErrWritingQueueFull ||
-		err == ErrServerIsBusy {
+	if errors.Is(err, ErrFileIsWriting) ||
+		errors.Is(err, ErrEntityTooLarge) ||
+		errors.Is(err, ErrWritingUnavailable) ||
+		errors.Is(err, ErrWritingQueueFull) ||
+		errors.Is(err, ErrServerIsBusy) {
 		return true
 	}
-	_, ok := err.(*CapacityError)
-	if ok {
-		return true
-	}
-	return false
+
+	var capacityErr *CapacityError
+	return errors.As(err, &capacityErr)
 }
diff --git a/internal/caches/errros_test.go b/internal/caches/errros_test.go
index 92bcbc4..29474ee 100644
--- a/internal/caches/errros_test.go
+++ b/internal/caches/errros_test.go
@@ -1,16 +1,24 @@
 // Copyright 2021 Liuxiangchao iwind.liu@gmail.com. All rights reserved.
 
-package caches
+package caches_test
 
 import (
+	"errors"
+	"fmt"
+	"github.com/TeaOSLab/EdgeNode/internal/caches"
 	"github.com/iwind/TeaGo/assert"
 	"testing"
 )
 
 func TestCanIgnoreErr(t *testing.T) {
-	a := assert.NewAssertion(t)
+	var a = assert.NewAssertion(t)
 
-	a.IsTrue(CanIgnoreErr(ErrFileIsWriting))
-	a.IsTrue(CanIgnoreErr(NewCapacityError("over capcity")))
-	a.IsFalse(CanIgnoreErr(ErrNotFound))
+	a.IsTrue(caches.CanIgnoreErr(caches.ErrFileIsWriting))
+	a.IsTrue(caches.CanIgnoreErr(fmt.Errorf("error: %w", caches.ErrFileIsWriting)))
+	a.IsTrue(errors.Is(fmt.Errorf("error: %w", caches.ErrFileIsWriting), caches.ErrFileIsWriting))
+	a.IsTrue(errors.Is(caches.ErrFileIsWriting, caches.ErrFileIsWriting))
+	a.IsTrue(caches.CanIgnoreErr(caches.NewCapacityError("over capacity")))
+	a.IsTrue(caches.CanIgnoreErr(fmt.Errorf("error: %w", caches.NewCapacityError("over capacity"))))
+	a.IsFalse(caches.CanIgnoreErr(caches.ErrNotFound))
+	a.IsFalse(caches.CanIgnoreErr(errors.New("test error")))
 }
diff --git a/internal/caches/storage_file.go b/internal/caches/storage_file.go
index 74fa32c..52358b4 100644
--- a/internal/caches/storage_file.go
+++ b/internal/caches/storage_file.go
@@ -464,7 +464,7 @@ func (this *FileStorage) openWriter(key string, expiredAt int64, status int, hea
 	_, ok := sharedWritingFileKeyMap[key]
 	if ok {
 		sharedWritingFileKeyLocker.Unlock()
-		return nil, ErrFileIsWriting
+		return nil, fmt.Errorf("%w(001)", ErrFileIsWriting)
 	}
 
 	if !isFlushing && !fsutils.WriteReady() {
@@ -505,7 +505,7 @@ func (this *FileStorage) openWriter(key string, expiredAt int64, status int, hea
 	// 检查两次写入缓存的时间是否过于相近，分片内容不受此限制
 	if err == nil && !isPartial && time.Since(stat.ModTime()) <= 1*time.Second {
 		// 防止并发连续写入
-		return nil, ErrFileIsWriting
+		return nil, fmt.Errorf("%w(002)", ErrFileIsWriting)
 	}
 
 	// 构造文件名
@@ -606,7 +606,7 @@ func (this *FileStorage) openWriter(key string, expiredAt int64, status int, hea
 	err = syscall.Flock(int(writer.Fd()), syscall.LOCK_EX|syscall.LOCK_NB)
 	if err != nil {
 		removeOnFailure = false
-		return nil, ErrFileIsWriting
+		return nil, fmt.Errorf("%w (003)", ErrFileIsWriting)
 	}
 
 	var metaBodySize int64 = -1
diff --git a/internal/caches/storage_file_test.go b/internal/caches/storage_file_test.go
index 69288d7..bae507d 100644
--- a/internal/caches/storage_file_test.go
+++ b/internal/caches/storage_file_test.go
@@ -231,7 +231,7 @@ func TestFileStorage_Concurrent_Open_DifferentFile(t *testing.T) {
 
 			writer, err := storage.OpenWriter("abc"+strconv.Itoa(i), time.Now().Unix()+3600, 200, -1, -1, -1, false)
 			if err != nil {
-				if err != ErrFileIsWriting {
+				if errors.Is(err, ErrFileIsWriting) {
 					t.Error(err)
 					return
 				}
@@ -289,7 +289,7 @@ func TestFileStorage_Concurrent_Open_SameFile(t *testing.T) {
 
 			writer, err := storage.OpenWriter("abc"+strconv.Itoa(0), time.Now().Unix()+3600, 200, -1, -1, -1, false)
 			if err != nil {
-				if err != ErrFileIsWriting {
+				if errors.Is(err, ErrFileIsWriting) {
 					t.Error(err)
 					return
 				}
diff --git a/internal/caches/storage_memory.go b/internal/caches/storage_memory.go
index 1b15765..137f5c3 100644
--- a/internal/caches/storage_memory.go
+++ b/internal/caches/storage_memory.go
@@ -1,6 +1,7 @@
 package caches
 
 import (
+	"fmt"
 	"github.com/TeaOSLab/EdgeCommon/pkg/serverconfigs"
 	"github.com/TeaOSLab/EdgeNode/internal/goman"
 	"github.com/TeaOSLab/EdgeNode/internal/remotelogs"
@@ -161,7 +162,7 @@ func (this *MemoryStorage) OpenWriter(key string, expiredAt int64, status int, h
 
 	// TODO 内存缓存暂时不支持分块内容存储
 	if isPartial {
-		return nil, ErrFileIsWriting
+		return nil, fmt.Errorf("%w (004)", ErrFileIsWriting)
 	}
 	return this.openWriter(key, expiredAt, status, headerSize, bodySize, maxSize, true)
 }
@@ -187,7 +188,7 @@ func (this *MemoryStorage) openWriter(key string, expiresAt int64, status int, h
 	var isWriting = false
 	_, ok := this.writingKeyMap[key]
 	if ok {
-		return nil, ErrFileIsWriting
+		return nil, fmt.Errorf("%w (005)", ErrFileIsWriting)
 	}
 	this.writingKeyMap[key] = zero.New()
 	defer func() {
@@ -208,7 +209,7 @@ func (this *MemoryStorage) openWriter(key string, expiresAt int64, status int, h
 			_ = this.list.Remove(hashString)
 			item = nil
 		} else {
-			return nil, ErrFileIsWriting
+			return nil, fmt.Errorf("%w (006)", ErrFileIsWriting)
 		}
 	}