BerriAI/litellm · error · ValueError

file_id is required for Bedrock file content retrieval

Error message

file_id is required for Bedrock file content retrieval

What it means

The Bedrock file-content path builds a SigV4-signed S3 GetObject request from the file id; without a file id there is nothing to sign or fetch, so transform_file_content_request raises before any bucket validation or signing. This guards the GET /v1/files/{id}/content route for Bedrock deployments.

Solutions

  1. Check the file id is a non-empty string before calling content()
  2. Capture and propagate create-file errors so downstream code never runs with an unset id
  3. On the proxy, reject /v1/files//content early with a 400

Example fix

# before
content = await client.files.content(file_id)  # file_id may be ""

# after
if not file_id:
    raise ValueError("file_id missing — did create_file succeed?")
content = await client.files.content(file_id)
Defensive patterns

Strategy: validation

Validate before calling

def fetch_content(client, file_id: str | None):
    if not file_id or not isinstance(file_id, str):
        raise ValueError("file_id must be a non-empty string (was the create call successful?)")
    return client.files.content(file_id)

Type guard

def is_valid_file_id(file_id: object) -> bool:
    return isinstance(file_id, str) and bool(file_id.strip())

Try / catch

try:
    content = await client.files.content(file_id)
except ValueError as e:
    if str(e) == "file_id is required for Bedrock file content retrieval":
        file_id = (await create_batch_file()).id  # recover the real id
        content = await client.files.content(file_id)
    else:
        raise

Prevention

When it happens

Trigger: client.files.content("") or a f-string file id that evaluated empty (file_id="/v1/files//content" style URLs); code that reads the id from a variable that was never populated because the create call failed earlier.

Common situations: Chaining create→content where create errored and the id stayed None/empty; template URLs with missing interpolation; API integrations passing query params straight through without presence checks.

Understand the failure class

Background: "missing required argument" and "the following required arguments were not provided": what required-argument errors mean and how to fix them — this error's family across 20 libraries.

Related errors

AI-assisted analysis of BerriAI/litellm@77b7c6c40c (2026-08-18). Data as JSON: /api/errors/3ad75d9e2aaad37c. Report an issue: GitHub.

Appendix: source

Thrown at litellm/llms/bedrock/files/transformation.py:1230

    ) -> list[OpenAIFileObject]:
        raise NotImplementedError("BedrockFilesConfig does not support file listing")

    def transform_file_content_request(
        self,
        file_content_request: FileContentRequest,
        optional_params: Mapping[str, object],
        litellm_params: MutableMapping[str, object],
    ) -> tuple[str, dict[str, str]]:
        """
        Build a SigV4-signed S3 GetObject request for a Bedrock batch file.

        Bedrock batch file ids are `s3://bucket/key` URIs (or unified ids
        that decode to one); the bucket and key are validated against the
        server-configured bucket before any request is signed.
        """
        file_id: Final = file_content_request.get("file_id")
        if not file_id:
            raise ValueError("file_id is required for Bedrock file content retrieval")

        s3_uri: Final = extract_s3_uri_from_file_id(file_id)
        bucket_name, object_key = _validate_file_id_against_configured_buckets(
            s3_uri=s3_uri,
            configured_bucket_names=get_configured_s3_bucket_names(litellm_params),
            allow_legacy_cloud_file_ids=should_allow_legacy_cloud_file_ids(litellm_params),
        )

        # The shared file-content handler passes optional_params={}, so AWS
        # credentials/region arrive via litellm_params here (unlike the upload
        # path). s3_region_name wins over aws_region_name, same priority as
        # get_complete_file_url above.
        merged_params: Final[dict[str, object]] = {}
        merged_params.update(litellm_params)
        merged_params.update(optional_params)
        request_params: Final = _BedrockS3RequestParams.model_validate(merged_params)

        region_preference: Final = request_params.s3_region_name or request_params.aws_region_name

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