fix: 解决 PHP 运行环境版本过期之后下载安装包失败的问题 (#6125)

backend/app/service/app.go

@@ -188,7 +188,7 @@ func (a AppService) GetAppDetail(appID uint, version, appType string) (response.
 
 		versionPath := filepath.Join(app.GetAppResourcePath(), detail.Version)
 		if !fileOp.Stat(versionPath) || detail.Update {
-			if err = downloadApp(app, detail, nil); err != nil {
+			if err = downloadApp(app, detail, nil); err != nil && !fileOp.Stat(versionPath) {
 				return appDetailDTO, err
 			}
 		}

backend/utils/http/request.go

@@ -2,6 +2,7 @@ package http
 
 import (
 	"context"
+	"errors"
 	"io"
 	"net/http"
 	"time"
@@ -35,6 +36,9 @@ func HandleGetWithTransport(url, method string, transport *http.Transport, timeo
 	if err != nil {
 		return 0, nil, err
 	}
+	if resp.StatusCode != http.StatusOK {
+		return 0, nil, errors.New(resp.Status)
+	}
 	body, err := io.ReadAll(resp.Body)
 	if err != nil {
 		return 0, nil, err