update download system

remove timeout

Assets/YooAsset/Runtime/DownloadSystem/Operation/Internal/UnityWebTextRequestOperation.cs

@@ -16,14 +16,22 @@ namespace YooAsset
         private UnityWebRequestAsyncOperation _requestOperation;
         private ESteps _steps = ESteps.None;
 
+        /// <summary>
+        /// 响应的超时时间（单位：秒），在经过Timeout的秒数后尝试中止。
+        /// 注意：当Timeout设置为0时，不会应用超时。
+        /// 注意：设置的超时值可能应用于Android上的每个URL重定向，这可能会导致响应时间增加。
+        /// </summary>
+        private readonly int _timeout;
+
         /// <summary>
         /// 请求结果
         /// </summary>
         public string Result { private set; get; }
 
 
-        internal UnityWebTextRequestOperation(string url, int timeout = 60) : base(url, timeout)
+        internal UnityWebTextRequestOperation(string url, int timeout) : base(url)
         {
+            _timeout = timeout;
         }
         internal override void InternalStart()
         {
@@ -36,7 +44,6 @@ namespace YooAsset
 
             if (_steps == ESteps.CreateRequest)
             {
-                ResetTimeout();
                 CreateWebRequest();
                 _steps = ESteps.Download;
             }
@@ -47,10 +54,7 @@ namespace YooAsset
                 DownloadedBytes = (long)_webRequest.downloadedBytes;
                 Progress = _requestOperation.progress;
                 if (_requestOperation.isDone == false)
-                {
-                    CheckRequestTimeout();
                     return;
-                }
 
                 if (CheckRequestResult())
                 {
@@ -81,8 +85,9 @@ namespace YooAsset
 
         private void CreateWebRequest()
         {
-            _webRequest = DownloadSystemHelper.NewUnityWebRequestGet(_requestURL);
             DownloadHandlerBuffer handler = new DownloadHandlerBuffer();
+            _webRequest = DownloadSystemHelper.NewUnityWebRequestGet(_requestURL);
+            _webRequest.timeout = _timeout;
             _webRequest.downloadHandler = handler;
             _webRequest.disposeDownloadHandlerOnDispose = true;
             _requestOperation = _webRequest.SendWebRequest();