src/anthropic/_client.py [150:178]:
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    @property
    @override
    def qs(self) -> Querystring:
        return Querystring(array_format="comma")

    @property
    @override
    def auth_headers(self) -> dict[str, str]:
        return {**self._api_key_auth, **self._bearer_auth}

    @property
    def _api_key_auth(self) -> dict[str, str]:
        api_key = self.api_key
        if api_key is None:
            return {}
        return {"X-Api-Key": api_key}

    @property
    def _bearer_auth(self) -> dict[str, str]:
        auth_token = self.auth_token
        if auth_token is None:
            return {}
        return {"Authorization": f"Bearer {auth_token}"}

    @property
    @override
    def default_headers(self) -> dict[str, str | Omit]:
        return {
            **super().default_headers,
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src/anthropic/_client.py [390:418]:
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    @property
    @override
    def qs(self) -> Querystring:
        return Querystring(array_format="comma")

    @property
    @override
    def auth_headers(self) -> dict[str, str]:
        return {**self._api_key_auth, **self._bearer_auth}

    @property
    def _api_key_auth(self) -> dict[str, str]:
        api_key = self.api_key
        if api_key is None:
            return {}
        return {"X-Api-Key": api_key}

    @property
    def _bearer_auth(self) -> dict[str, str]:
        auth_token = self.auth_token
        if auth_token is None:
            return {}
        return {"Authorization": f"Bearer {auth_token}"}

    @property
    @override
    def default_headers(self) -> dict[str, str | Omit]:
        return {
            **super().default_headers,
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