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fix(bedrock): trim beta names when copying anthropic-beta into the body #2024

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fix(bedrock): trim beta names when copying anthropic-beta into the body #2024

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5 changes: 3 additions & 2 deletions src/anthropic/lib/bedrock/_client.py
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Original file line number Diff line number Diff line change
Expand Up @@ -41,9 +41,10 @@ def _prepare_options(input_options: FinalRequestOptions) -> FinalRequestOptions:
options.json_data.setdefault("anthropic_version", DEFAULT_VERSION)

if is_given(options.headers):
betas = build_headers(options.headers)[0].get("anthropic-beta")
beta_header = build_headers(options.headers)[0].get("anthropic-beta") or ""
betas = [beta.strip() for beta in beta_header.split(",") if beta.strip()]
if betas:
options.json_data.setdefault("anthropic_beta", betas.split(","))
options.json_data.setdefault("anthropic_beta", betas)

if options.url in {"/v1/complete", "/v1/messages", "/v1/messages?beta=true"} and options.method == "post":
if not is_dict(options.json_data):
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16 changes: 16 additions & 0 deletions tests/lib/test_bedrock.py
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Original file line number Diff line number Diff line change
Expand Up @@ -649,6 +649,22 @@ def test_prepare_options_lifts_anthropic_beta_header_case_insensitively() -> Non
]


def test_prepare_options_strips_whitespace_from_anthropic_beta_header() -> None:
options = _prepare_options(
FinalRequestOptions(
method="post",
url="/v1/messages",
json_data={"model": "anthropic.claude-sonnet-4-5"},
headers={"anthropic-beta": "context-1m-2025-08-07, other-beta,"},
)
)

assert cast("dict[str, object]", options.json_data).get("anthropic_beta") == [
"context-1m-2025-08-07",
"other-beta",
]


@pytest.mark.respx()
def test_betas_param_and_extra_headers_case_variant(respx_mock: MockRouter) -> None:
# `extra_headers` overrides the header written by `betas`, on the wire and in the body
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