diff --git a/litellm/llms/bedrock/chat/invoke_transformations/base_invoke_transformation.py b/litellm/llms/bedrock/chat/invoke_transformations/base_invoke_transformation.py
index a316eb7ea6..5414429d4c 100644
--- a/litellm/llms/bedrock/chat/invoke_transformations/base_invoke_transformation.py
+++ b/litellm/llms/bedrock/chat/invoke_transformations/base_invoke_transformation.py
@@ -129,7 +129,6 @@ class AmazonInvokeConfig(BaseConfig, BaseAWSLLM):
 
         ## CREDENTIALS ##
         # pop aws_secret_access_key, aws_access_key_id, aws_session_token, aws_region_name from kwargs, since completion calls fail with them
-        extra_headers = optional_params.get("extra_headers", None)
         aws_secret_access_key = optional_params.get("aws_secret_access_key", None)
         aws_access_key_id = optional_params.get("aws_access_key_id", None)
         aws_session_token = optional_params.get("aws_session_token", None)
@@ -155,9 +154,10 @@ class AmazonInvokeConfig(BaseConfig, BaseAWSLLM):
         )
 
         sigv4 = SigV4Auth(credentials, "bedrock", aws_region_name)
-        headers = {"Content-Type": "application/json"}
-        if extra_headers is not None:
-            headers = {"Content-Type": "application/json", **extra_headers}
+        if headers is not None:
+            headers = {"Content-Type": "application/json", **headers}
+        else:
+            headers = {"Content-Type": "application/json"}
 
         request = AWSRequest(
             method="POST",
@@ -166,12 +166,13 @@ class AmazonInvokeConfig(BaseConfig, BaseAWSLLM):
             headers=headers,
         )
         sigv4.add_auth(request)
-        if (
-            extra_headers is not None and "Authorization" in extra_headers
-        ):  # prevent sigv4 from overwriting the auth header
-            request.headers["Authorization"] = extra_headers["Authorization"]
 
-        return dict(request.headers)
+        request_headers_dict = dict(request.headers)
+        if (
+            headers is not None and "Authorization" in headers
+        ):  # prevent sigv4 from overwriting the auth header
+            request_headers_dict["Authorization"] = headers["Authorization"]
+        return request_headers_dict
 
     def transform_request(
         self,
@@ -443,7 +444,7 @@ class AmazonInvokeConfig(BaseConfig, BaseAWSLLM):
         api_key: Optional[str] = None,
         api_base: Optional[str] = None,
     ) -> dict:
-        return {}
+        return headers
 
     def get_error_class(
         self, error_message: str, status_code: int, headers: Union[dict, httpx.Headers]
diff --git a/litellm/llms/custom_httpx/llm_http_handler.py b/litellm/llms/custom_httpx/llm_http_handler.py
index 0459854c4e..9d67fd1a85 100644
--- a/litellm/llms/custom_httpx/llm_http_handler.py
+++ b/litellm/llms/custom_httpx/llm_http_handler.py
@@ -873,7 +873,9 @@ class BaseLLMHTTPHandler:
         elif isinstance(audio_file, bytes):
             # Assume it's already binary data
             binary_data = audio_file
-        elif isinstance(audio_file, io.BufferedReader) or isinstance(audio_file, io.BytesIO):
+        elif isinstance(audio_file, io.BufferedReader) or isinstance(
+            audio_file, io.BytesIO
+        ):
             # Handle file-like objects
             binary_data = audio_file.read()
 
diff --git a/tests/llm_translation/test_bedrock_completion.py b/tests/llm_translation/test_bedrock_completion.py
index cc8cc163d4..e2948789fc 100644
--- a/tests/llm_translation/test_bedrock_completion.py
+++ b/tests/llm_translation/test_bedrock_completion.py
@@ -956,7 +956,7 @@ def test_bedrock_ptu():
 
 
 @pytest.mark.asyncio
-async def test_bedrock_extra_headers():
+async def test_bedrock_custom_api_base():
     """
     Check if a url with 'modelId' passed in, is created correctly
 
@@ -994,6 +994,44 @@ async def test_bedrock_extra_headers():
         mock_client_post.assert_called_once()
 
 
+@pytest.mark.parametrize(
+    "model",
+    [
+        "anthropic.claude-3-sonnet-20240229-v1:0",
+        "bedrock/invoke/anthropic.claude-3-sonnet-20240229-v1:0",
+    ],
+)
+@pytest.mark.asyncio
+async def test_bedrock_extra_headers(model):
+    """
+    Relevant Issue: https://github.com/BerriAI/litellm/issues/9106
+    """
+    client = AsyncHTTPHandler()
+
+    with patch.object(client, "post", new=AsyncMock()) as mock_client_post:
+        litellm.set_verbose = True
+        from openai.types.chat import ChatCompletion
+
+        try:
+            response = await litellm.acompletion(
+                model=model,
+                messages=[{"role": "user", "content": "What's AWS?"}],
+                client=client,
+                extra_headers={"test": "hello world", "Authorization": "my-test-key"},
+            )
+        except Exception as e:
+            print(f"error: {e}")
+
+        print(f"mock_client_post.call_args.kwargs: {mock_client_post.call_args.kwargs}")
+        assert "test" in mock_client_post.call_args.kwargs["headers"]
+        assert mock_client_post.call_args.kwargs["headers"]["test"] == "hello world"
+        assert (
+            mock_client_post.call_args.kwargs["headers"]["Authorization"]
+            == "my-test-key"
+        )
+        mock_client_post.assert_called_once()
+
+
 @pytest.mark.asyncio
 async def test_bedrock_custom_prompt_template():
     """