diff --git a/internal/handler/sendfile_test.go b/internal/handler/sendfile_test.go
index ba11279..0f603b7 100644
--- a/internal/handler/sendfile_test.go
+++ b/internal/handler/sendfile_test.go
@@ -35,7 +35,7 @@ func TestCopyFile(t *testing.T) {
 	tmpFile := filepath.Join(tmpDir, "test.txt")
 
 	content := []byte("Hello, World! This is test content for copyFile.")
-	if err := os.WriteFile(tmpFile, content, 0644); err != nil {
+	if err := os.WriteFile(tmpFile, content, 0o644); err != nil {
 		t.Fatalf("Failed to create temp file: %v", err)
 	}
 
@@ -145,7 +145,7 @@ func TestSendFile_SmallFile(t *testing.T) {
 	tmpFile := filepath.Join(tmpDir, "small.txt")
 
 	content := []byte("small file content")
-	if err := os.WriteFile(tmpFile, content, 0644); err != nil {
+	if err := os.WriteFile(tmpFile, content, 0o644); err != nil {
 		t.Fatalf("Failed to create temp file: %v", err)
 	}
 
@@ -174,7 +174,7 @@ func TestSendFile_WithOffset(t *testing.T) {
 	tmpFile := filepath.Join(tmpDir, "test.txt")
 
 	content := []byte("0123456789ABCDEF")
-	if err := os.WriteFile(tmpFile, content, 0644); err != nil {
+	if err := os.WriteFile(tmpFile, content, 0o644); err != nil {
 		t.Fatalf("Failed to create temp file: %v", err)
 	}
 
@@ -203,7 +203,7 @@ func TestSendFile_ZeroLength(t *testing.T) {
 	tmpDir := t.TempDir()
 	tmpFile := filepath.Join(tmpDir, "empty.txt")
 
-	if err := os.WriteFile(tmpFile, []byte{}, 0644); err != nil {
+	if err := os.WriteFile(tmpFile, []byte{}, 0o644); err != nil {
 		t.Fatalf("Failed to create temp file: %v", err)
 	}
 
@@ -241,7 +241,7 @@ func TestCopyFile_Error(t *testing.T) {
 	tmpFile := filepath.Join(tmpDir, "test.txt")
 
 	content := []byte("test content")
-	if err := os.WriteFile(tmpFile, content, 0644); err != nil {
+	if err := os.WriteFile(tmpFile, content, 0o644); err != nil {
 		t.Fatalf("Failed to create temp file: %v", err)
 	}
 
@@ -265,7 +265,7 @@ func TestLinuxSendfile_NilConn(t *testing.T) {
 	tmpDir := t.TempDir()
 	tmpFile := filepath.Join(tmpDir, "test.txt")
 	content := []byte("test")
-	_ = os.WriteFile(tmpFile, content, 0644)
+	_ = os.WriteFile(tmpFile, content, 0o644)
 
 	file, err := os.Open(tmpFile)
 	if err != nil {
diff --git a/internal/proxy/health.go b/internal/proxy/health.go
index fff545d..c598657 100644
--- a/internal/proxy/health.go
+++ b/internal/proxy/health.go
@@ -189,7 +189,6 @@ func (h *HealthChecker) checkTarget(target *loadbalance.Target) {
 
 	// 执行带超时的健康检查
 	err := h.client.DoTimeout(req, resp, h.timeout)
-
 	if err != nil {
 		// 连接失败或超时 - 标记为不健康
 		target.Healthy.Store(false)
diff --git a/internal/proxy/tempfile.go b/internal/proxy/tempfile.go
index 0b73f04..5530426 100644
--- a/internal/proxy/tempfile.go
+++ b/internal/proxy/tempfile.go
@@ -93,7 +93,7 @@ func NewTempFileManager(tempPath, threshold, maxSize string) (*TempFileManager,
 	}
 
 	// 确保临时目录存在
-	if err := os.MkdirAll(tempPath, 0755); err != nil {
+	if err := os.MkdirAll(tempPath, 0o755); err != nil {
 		return nil, fmt.Errorf("创建临时目录失败: %w", err)
 	}
 
@@ -456,8 +456,10 @@ func (w *DynamicTempFileWriter) Cleanup() {
 }
 
 // defaultTempFileManager 默认临时文件管理器（未配置时使用）。
-var defaultTempFileManager *TempFileManager
-var defaultTempFileManagerOnce sync.Once
+var (
+	defaultTempFileManager     *TempFileManager
+	defaultTempFileManagerOnce sync.Once
+)
 
 // GetDefaultTempFileManager 获取默认临时文件管理器。
 //