From 2d2b32c3f8ab5e51868d363860ea996383336236 Mon Sep 17 00:00:00 2001
From: Lavya Tandel <LavyaTandel@users.noreply.github.com>
Date: Mon, 10 Aug 2026 23:56:49 +0530
Subject: [PATCH] fix(bedrock): use actual file size when Content-Length
 missing (#36388)

---
 litellm/llms/bedrock/files/transformation.py  | 11 +++-
 .../test_bedrock_files_transformation.py      | 55 +++++++++++++++++++
 2 files changed, 65 insertions(+), 1 deletion(-)

diff --git a/litellm/llms/bedrock/files/transformation.py b/litellm/llms/bedrock/files/transformation.py
index bd3570d50a3..d92be2104ff 100644
--- a/litellm/llms/bedrock/files/transformation.py
+++ b/litellm/llms/bedrock/files/transformation.py
@@ -861,6 +861,9 @@ class BedrockFilesConfig(BaseAWSLLM, BaseFilesConfig):
         )
 
         litellm_params["upload_url"] = api_base
+        # Store file size for response transformation (S3 PUT response
+        # doesn't include Content-Length, so we pass it through).
+        litellm_params["_file_content_size"] = len(file_content) if isinstance(file_content, (str, bytes)) else 0
 
         # Return a dict that tells the HTTP handler exactly what to do
         return {
@@ -1024,6 +1027,12 @@ class BedrockFilesConfig(BaseAWSLLM, BaseFilesConfig):
         # S3 PUT object returns ETag and other metadata in headers
         content_length: Final = response_headers.get("Content-Length", "0")
 
+        # S3 PUT responses may not include Content-Length, so fall back
+        # to the actual content size captured during request transformation.
+        file_size: int = int(content_length) if content_length.isdigit() else 0
+        if file_size == 0:
+            file_size = litellm_params.get("_file_content_size", 0)
+
         # Use the actual upload URL that was used for the S3 upload
         upload_url: Final = litellm_params.get("upload_url")
         file_id: str = ""
@@ -1038,7 +1047,7 @@ class BedrockFilesConfig(BaseAWSLLM, BaseFilesConfig):
             filename=filename,
             created_at=int(time.time()),  # Current timestamp
             status="uploaded",
-            bytes=int(content_length) if content_length.isdigit() else 0,
+            bytes=file_size,
             object="file",
         )
 
diff --git a/tests/test_litellm/llms/bedrock/files/test_bedrock_files_transformation.py b/tests/test_litellm/llms/bedrock/files/test_bedrock_files_transformation.py
index 270add48e0e..c9debd41b51 100644
--- a/tests/test_litellm/llms/bedrock/files/test_bedrock_files_transformation.py
+++ b/tests/test_litellm/llms/bedrock/files/test_bedrock_files_transformation.py
@@ -2038,6 +2038,61 @@ class TestBedrockFilesS3SignatureEncoding:
             headers=signed["headers"],
         )
 
+    def test_transform_create_file_response_bytes_from_content_length(self):
+        """bytes should reflect actual file size when Content-Length is present."""
+        import httpx
+
+        from litellm.llms.bedrock.files.transformation import BedrockFilesConfig
+
+        raw_response = httpx.Response(
+            status_code=200,
+            headers={"Content-Length": "4096"},
+            content=b"",
+            request=httpx.Request(
+                "PUT",
+                "https://s3.us-east-1.amazonaws.com/my-bucket/litellm-bedrock-files-anthropic.claude-3-5-sonnet-20240620-v1:0-abc123.jsonl",
+            ),
+        )
+
+        result = BedrockFilesConfig().transform_create_file_response(
+            model=None,
+            raw_response=raw_response,
+            logging_obj=MagicMock(),
+            litellm_params={},
+        )
+
+        assert result.bytes == 4096
+
+    def test_transform_create_file_response_bytes_falls_back_to_content_size(self):
+        """When S3 PUT response omits Content-Length, bytes should fall back
+        to the actual content size captured during request transformation.
+
+        Regression test for #36388.
+        """
+        import httpx
+
+        from litellm.llms.bedrock.files.transformation import BedrockFilesConfig
+
+        raw_response = httpx.Response(
+            status_code=200,
+            # S3 PUT responses typically omit Content-Length
+            headers={},
+            content=b"",
+            request=httpx.Request(
+                "PUT",
+                "https://s3.us-east-1.amazonaws.com/my-bucket/litellm-bedrock-files-anthropic.claude-3-5-sonnet-20240620-v1:0-abc123.jsonl",
+            ),
+        )
+
+        result = BedrockFilesConfig().transform_create_file_response(
+            model=None,
+            raw_response=raw_response,
+            logging_obj=MagicMock(),
+            litellm_params={"_file_content_size": 2048},
+        )
+
+        assert result.bytes == 2048
+
     def test_file_content_signs_spaced_object_key_the_way_s3_does(
         self, monkeypatch: pytest.MonkeyPatch
     ) -> None: