diff --git a/Assets/YooAsset/Runtime/DownloadSystem/DefaultDownloadBackend/UnityWebRequestCreator.cs b/Assets/YooAsset/Runtime/DownloadSystem/DefaultDownloadBackend/UnityWebRequestCreator.cs
index c982a434..698103e5 100644
--- a/Assets/YooAsset/Runtime/DownloadSystem/DefaultDownloadBackend/UnityWebRequestCreator.cs
+++ b/Assets/YooAsset/Runtime/DownloadSystem/DefaultDownloadBackend/UnityWebRequestCreator.cs
@@ -6,5 +6,5 @@ namespace YooAsset
     /// <summary>
     /// 自定义下载器的请求委托
     /// </summary>
-    public delegate UnityWebRequest UnityWebRequestCreator(string url);
+    public delegate UnityWebRequest UnityWebRequestCreator(string url, string method);
 }
diff --git a/Assets/YooAsset/Runtime/DownloadSystem/DefaultDownloadRequest/UnityWebRequestBytesDownloader.cs b/Assets/YooAsset/Runtime/DownloadSystem/DefaultDownloadRequest/UnityWebRequestBytesDownloader.cs
index f12b2857..db887947 100644
--- a/Assets/YooAsset/Runtime/DownloadSystem/DefaultDownloadRequest/UnityWebRequestBytesDownloader.cs
+++ b/Assets/YooAsset/Runtime/DownloadSystem/DefaultDownloadRequest/UnityWebRequestBytesDownloader.cs
@@ -46,16 +46,7 @@ namespace YooAsset
         /// </summary>
         protected override void OnRequestSucceed()
         {
-            var fileData = _webRequest.downloadHandler.data;
-            if (fileData == null || fileData.Length == 0)
-            {
-                Status = EDownloadRequestStatus.Failed;
-                Error = $"[{GetType().Name}] URL: {URL} - Download bytes data is null or empty !";
-            }
-            else
-            {
-                Result = fileData;
-            }
+            Result = _webRequest.downloadHandler.data;
         }
     }
 }
diff --git a/Assets/YooAsset/Runtime/DownloadSystem/DefaultDownloadRequest/UnityWebRequestDownloaderBase.cs b/Assets/YooAsset/Runtime/DownloadSystem/DefaultDownloadRequest/UnityWebRequestDownloaderBase.cs
index 60d1c078..f6e6f680 100644
--- a/Assets/YooAsset/Runtime/DownloadSystem/DefaultDownloadRequest/UnityWebRequestDownloaderBase.cs
+++ b/Assets/YooAsset/Runtime/DownloadSystem/DefaultDownloadRequest/UnityWebRequestDownloaderBase.cs
@@ -202,7 +202,7 @@ namespace YooAsset
         protected UnityWebRequest CreateUnityWebRequestGet(string requestUrl)
         {
             if (_webRequestCreator != null)
-                return _webRequestCreator.Invoke(requestUrl);
+                return _webRequestCreator.Invoke(requestUrl, UnityWebRequest.kHttpVerbGET);
 
             return new UnityWebRequest(requestUrl, UnityWebRequest.kHttpVerbGET);
         }
@@ -214,6 +214,9 @@ namespace YooAsset
         /// <returns>UnityWebRequest 实例</returns>
         protected UnityWebRequest CreateUnityWebRequestHead(string requestUrl)
         {
+            if (_webRequestCreator != null)
+                return _webRequestCreator.Invoke(requestUrl, UnityWebRequest.kHttpVerbHEAD);
+
             return new UnityWebRequest(requestUrl, UnityWebRequest.kHttpVerbHEAD);
         }
 
diff --git a/Assets/YooAsset/Runtime/DownloadSystem/DefaultDownloadRequest/UnityWebRequestTextDownloader.cs b/Assets/YooAsset/Runtime/DownloadSystem/DefaultDownloadRequest/UnityWebRequestTextDownloader.cs
index fee9fb06..ee4a0e06 100644
--- a/Assets/YooAsset/Runtime/DownloadSystem/DefaultDownloadRequest/UnityWebRequestTextDownloader.cs
+++ b/Assets/YooAsset/Runtime/DownloadSystem/DefaultDownloadRequest/UnityWebRequestTextDownloader.cs
@@ -46,16 +46,7 @@ namespace YooAsset
         /// </summary>
         protected override void OnRequestSucceed()
         {
-            var fileText = _webRequest.downloadHandler.text;
-            if (string.IsNullOrEmpty(fileText))
-            {
-                Status = EDownloadRequestStatus.Failed;
-                Error = $"[{GetType().Name}] URL: {URL} - Download text data is null or empty";
-            }
-            else
-            {
-                Result = fileText;
-            }
+            Result = _webRequest.downloadHandler.text;
         }
     }
 }
diff --git a/Assets/YooAsset/Runtime/DownloadSystem/README.md b/Assets/YooAsset/Runtime/DownloadSystem/README.md
index 065f1b22..26cdff6c 100644
--- a/Assets/YooAsset/Runtime/DownloadSystem/README.md
+++ b/Assets/YooAsset/Runtime/DownloadSystem/README.md
@@ -268,9 +268,9 @@ public struct DownloadSimulateRequestArgs
 
 ```csharp
 // 自定义 UnityWebRequest 创建（建议通过 backend 构造函数传入）
-UnityWebRequestCreator creator = (url) =>
+UnityWebRequestCreator creator = (url, method) =>
 {
-    var request = new UnityWebRequest(url, UnityWebRequest.kHttpVerbGET);
+    var request = new UnityWebRequest(url, method);
     // 自定义配置...
     return request;
 };
@@ -540,6 +540,10 @@ VirtualFileDownloader (独立实现) ──► IDownloadFileRequest
 
 请求失败计数器，用于诊断统计：
 
+- 线程安全：内部使用 `Dictionary` 且未加锁，约定只在主线程调用；如需多线程统计请在外层加锁或改造实现
+- Key 规则：`$"{packageName}_{eventName}"`
+- 统计口径：**仅统计网络请求失败**（`IDownloadRequest.Status != Succeed` 时记录），不统计内容为空、校验失败、解析失败等业务层失败
+
 ```csharp
 // 记录失败
 WebRequestCounter.RecordRequestFailed(packageName, eventName);
@@ -553,6 +557,8 @@ int count = WebRequestCounter.GetRequestFailedCount(packageName, eventName);
 ## 注意事项
 
 1. **资源释放**：使用完毕后务必调用 `Dispose()` 释放资源
+   - `AbortRequest()` 仅用于中止请求与切换状态，不等同于释放资源；无论成功/失败/中止都需要 `Dispose()`
+   - 推荐使用 `try/finally` 确保释放（尤其是上层可能提前中止的场景）
 2. **断点续传**：需要服务器支持 `Range` 请求头和 `206 Partial Content` 响应
    - 若服务端不支持 Range 仍返回 200，全量内容可能会被追加写入，导致文件损坏
 3. **看门狗超时**：设置为 0 表示禁用，建议根据网络环境设置合理值
diff --git a/Assets/YooAsset/Runtime/DownloadSystem/WebRequestCounter.cs b/Assets/YooAsset/Runtime/DownloadSystem/WebRequestCounter.cs
index 72984b55..e06c7cfc 100644
--- a/Assets/YooAsset/Runtime/DownloadSystem/WebRequestCounter.cs
+++ b/Assets/YooAsset/Runtime/DownloadSystem/WebRequestCounter.cs
@@ -1,9 +1,14 @@
-using System;
-using System.Collections;
 using System.Collections.Generic;
 
 namespace YooAsset
 {
+    /// <summary>
+    /// 网络请求失败计数器（诊断用）
+    /// </summary>
+    /// <remarks>
+    /// 线程安全：内部使用 Dictionary 且未加锁，约定只在 Unity 主线程调用。
+    /// 如需在多线程/回调线程调用，请在外层加锁或改为并发容器实现。
+    /// </remarks>
     internal class WebRequestCounter
     {
 #if UNITY_EDITOR
@@ -15,12 +20,12 @@ namespace YooAsset
 #endif
 
         /// <summary>
-        /// 记录网络请求失败事件的次数
+        /// 失败计数记录表（key = $"{packageName}_{eventName}"）
         /// </summary>
         private static readonly Dictionary<string, int> _requestFailedRecorder = new Dictionary<string, int>(1000);
 
         /// <summary>
-        /// 记录请求失败事件
+        /// 记录一次失败
         /// </summary>
         public static void RecordRequestFailed(string packageName, string eventName)
         {
@@ -31,7 +36,7 @@ namespace YooAsset
         }
 
         /// <summary>
-        /// 获取请求失败的次数
+        /// 获取失败次数
         /// </summary>
         public static int GetRequestFailedCount(string packageName, string eventName)
         {
@@ -41,4 +46,4 @@ namespace YooAsset
             return _requestFailedRecorder[key];
         }
     }
-}
\ No newline at end of file
+}
diff --git a/Assets/YooAsset/Runtime/FileSystem/DefaultBuildinFileSystem/CatalogTools.cs b/Assets/YooAsset/Runtime/FileSystem/DefaultBuildinFileSystem/CatalogTools.cs
index 3aaf908e..446c2ee1 100644
--- a/Assets/YooAsset/Runtime/FileSystem/DefaultBuildinFileSystem/CatalogTools.cs
+++ b/Assets/YooAsset/Runtime/FileSystem/DefaultBuildinFileSystem/CatalogTools.cs
@@ -205,6 +205,9 @@ namespace YooAsset
         /// </summary>
         public static DefaultBuildinFileCatalog DeserializeFromBinary(byte[] binaryData)
         {
+            if (binaryData == null || binaryData.Length == 0)
+                throw new Exception("Catalog file data is null or empty !");
+
             // 创建缓存器
             BufferReader buffer = new BufferReader(binaryData);
 
diff --git a/Assets/YooAsset/Runtime/FileSystem/README.md b/Assets/YooAsset/Runtime/FileSystem/README.md
index 85b304f8..9cd92a73 100644
--- a/Assets/YooAsset/Runtime/FileSystem/README.md
+++ b/Assets/YooAsset/Runtime/FileSystem/README.md
@@ -355,9 +355,9 @@ var webRemoteParams = FileSystemParameters.CreateDefaultWebRemoteFileSystemParam
 var cacheParams = FileSystemParameters.CreateDefaultCacheFileSystemParameters(remoteServices);
 
 // 设置 UnityWebRequest 创建委托（用于证书/代理/自定义 Header 等）
-cacheParams.AddParameter(FileSystemParametersDefine.UNITY_WEB_REQUEST_CREATOR, (UnityWebRequestCreator)((url) =>
+cacheParams.AddParameter(FileSystemParametersDefine.UNITY_WEB_REQUEST_CREATOR, (UnityWebRequestCreator)((url, method) =>
 {
-    var request = new UnityEngine.Networking.UnityWebRequest(url, UnityEngine.Networking.UnityWebRequest.kHttpVerbGET);
+    var request = new UnityEngine.Networking.UnityWebRequest(url, method);
     // 自定义配置...
     return request;
 }));