fix: async_download 增加检查连接状态

Signed-off-by: Jia Chao <jiac13@chinaunicom.cn>

src/file.rs

@@ -146,6 +146,11 @@ pub async fn async_download<P: AsRef<Path>>(url: String, target: Option<P>) -> c
     // 发送 GET 请求获取响应
     let response = client.get(url.clone()).send().await?;
 
+    // 检查连接状态，失败会返回错误
+    if !response.status().is_success() {
+        return Err(format!("下载 {} 失败：{}", url, response.status()).into());
+    }
+
     // 确定下载文件的路径
     let download_file = match target {
         Some(file) => {