misc: update README file;

scripts/destVersionForMac.py

@@ -76,7 +76,7 @@ def fetch_download_link() -> str:
             str: 下载链接 URL
     """
     # Fetch HTML and extract the first download link on the page.
-    with urllib.request.urlopen(WEBSITE_URL) as response:
+    with urllib.request.urlopen(WEBSITE_URL, timeout=30) as response:
         html = response.read().decode("utf-8", errors="replace")
     parser = DownloadLinkParser()
     parser.feed(html)
@@ -92,22 +92,11 @@ def fetch_head_metadata(url: str) -> dict[str, str]:
     Returns:
         dict[str, str]: 从 HEAD 响应中提取的元数据字典，键为小写字符串，值为对应的响应头值
     """
+
     # Use HEAD request to read metadata from the direct file link.
-    attempts = 2
+    request = urllib.request.Request(url, method="HEAD")
-    last_error: Exception | None = None
+    with urllib.request.urlopen(request, timeout=30) as response:
-    for attempt in range(1, attempts + 1):
+        return {key.lower(): value.strip() for key, value in response.headers.items()}
-        try:
-            request = urllib.request.Request(url, method="HEAD")
-            with urllib.request.urlopen(request) as response:
-                return {key.lower(): value.strip() for key, value in response.headers.items()}
-        except Exception as exc:
-            last_error = exc
-            if attempt < attempts:
-                log(f"HEAD request failed (attempt {attempt}). Waiting before retry...")
-                time.sleep(10)
-    if last_error:
-        log(f"HEAD request failed after {attempts} attempts: {last_error}")
-        return {}
 
 def download_with_retry(url: str, dest: Path) -> None:
     """
@@ -132,6 +121,8 @@ def download_with_retry(url: str, dest: Path) -> None:
                     "--waitretry",
                     "5",
                     "--retry-connrefused",
+                    "--timeout",
+                    "30",
                     url,
                     "-O",
                     str(dest),