diff --git a/python/aibrix/aibrix/downloader/s3.py b/python/aibrix/aibrix/downloader/s3.py
index 43e87c8c..b3112ac3 100644
--- a/python/aibrix/aibrix/downloader/s3.py
+++ b/python/aibrix/aibrix/downloader/s3.py
@@ -13,7 +13,7 @@
 # limitations under the License.
 from functools import lru_cache
 from pathlib import Path
-from typing import List
+from typing import List, Tuple
 from urllib.parse import urlparse
 
 import boto3
@@ -24,7 +24,7 @@
 from aibrix.downloader.base import BaseDownloader
 
 
-def _parse_bucket_info_from_uri(uri):
+def _parse_bucket_info_from_uri(uri: str) -> Tuple[str, str]:
     parsed = urlparse(uri, scheme="s3")
     bucket_name = parsed.netloc
     bucket_path = parsed.path.lstrip("/")
diff --git a/python/aibrix/aibrix/downloader/tos.py b/python/aibrix/aibrix/downloader/tos.py
index 4ff25bbe..a77b9db3 100644
--- a/python/aibrix/aibrix/downloader/tos.py
+++ b/python/aibrix/aibrix/downloader/tos.py
@@ -12,7 +12,6 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 import logging
-import re
 from functools import lru_cache
 from pathlib import Path
 from typing import List, Tuple
@@ -29,18 +28,11 @@
 tos_logger.setLevel(logging.WARNING)
 
 
-def _parse_bucket_info_from_uri(model_uri: str) -> Tuple[str, str, str, str]:
-    if not re.match(envs.DOWNLOADER_TOS_REGEX, model_uri):
-        raise ValueError(f"TOS uri {model_uri} not valid format.")
-    parsed = urlparse(model_uri)
-    bucket_name, endpoint = parsed.netloc.split(".", 1)
+def _parse_bucket_info_from_uri(uri: str) -> Tuple[str, str]:
+    parsed = urlparse(uri, scheme="tos")
+    bucket_name = parsed.netloc
     bucket_path = parsed.path.lstrip("/")
-    matched = re.match(r"tos-(.+?).volces.com", endpoint)
-    if matched is None:
-        raise ValueError(f"TOS endpoint {endpoint} not valid format.")
-
-    region = matched.group(1)
-    return bucket_name, bucket_path, endpoint, region
+    return bucket_name, bucket_path
 
 
 class TOSDownloader(BaseDownloader):
@@ -48,12 +40,17 @@ def __init__(self, model_uri):
         model_name = envs.DOWNLOADER_MODEL_NAME
         ak = envs.DOWNLOADER_TOS_ACCESS_KEY
         sk = envs.DOWNLOADER_TOS_SECRET_KEY
-        bucket_name, bucket_path, endpoint, region = _parse_bucket_info_from_uri(
-            model_uri
-        )
+        endpoint = envs.DOWNLOADER_TOS_ENDPOINT or ''
+        region = envs.DOWNLOADER_TOS_REGION or ''
+        bucket_name, bucket_path = _parse_bucket_info_from_uri(model_uri)
         self.bucket_name = bucket_name
         self.bucket_path = bucket_path
-        self.client = tos.TosClientV2(ak, sk, endpoint, region)
+        
+        self.client = tos.TosClientV2(ak=ak,
+                                      sk=sk,
+                                      endpoint=endpoint,
+                                      region=region)
+        
         super().__init__(model_uri=model_uri, model_name=model_name)  # type: ignore
 
     def _valid_config(self):
diff --git a/python/aibrix/aibrix/envs.py b/python/aibrix/aibrix/envs.py
index 90465da0..eef792ee 100644
--- a/python/aibrix/aibrix/envs.py
+++ b/python/aibrix/aibrix/envs.py
@@ -52,7 +52,7 @@ def _parse_int_or_none(value: Optional[str]) -> Optional[int]:
 
 # Downloader Regex
 DOWNLOADER_S3_REGEX = r"^s3://"
-DOWNLOADER_TOS_REGEX = r"https://(.+?).tos-(.+?).volces.com/(.+)"
+DOWNLOADER_TOS_REGEX = r"^tos://"
 
 # Downloader HuggingFace Envs
 DOWNLOADER_HF_TOKEN = os.getenv("HF_TOKEN")