src/anthropic/_client.py [180:206]:
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            "anthropic-version": "2023-06-01",
            **self._custom_headers,
        }

    @override
    def _validate_headers(self, headers: Headers, custom_headers: Headers) -> None:
        if self.api_key and headers.get("X-Api-Key"):
            return
        if isinstance(custom_headers.get("X-Api-Key"), Omit):
            return

        if self.auth_token and headers.get("Authorization"):
            return
        if isinstance(custom_headers.get("Authorization"), Omit):
            return

        raise TypeError(
            '"Could not resolve authentication method. Expected either api_key or auth_token to be set. Or for one of the `X-Api-Key` or `Authorization` headers to be explicitly omitted"'
        )

    def copy(
        self,
        *,
        api_key: str | None = None,
        auth_token: str | None = None,
        base_url: str | httpx.URL | None = None,
        timeout: float | Timeout | None | NotGiven = NOT_GIVEN,
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src/anthropic/_client.py [420:446]:
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            "anthropic-version": "2023-06-01",
            **self._custom_headers,
        }

    @override
    def _validate_headers(self, headers: Headers, custom_headers: Headers) -> None:
        if self.api_key and headers.get("X-Api-Key"):
            return
        if isinstance(custom_headers.get("X-Api-Key"), Omit):
            return

        if self.auth_token and headers.get("Authorization"):
            return
        if isinstance(custom_headers.get("Authorization"), Omit):
            return

        raise TypeError(
            '"Could not resolve authentication method. Expected either api_key or auth_token to be set. Or for one of the `X-Api-Key` or `Authorization` headers to be explicitly omitted"'
        )

    def copy(
        self,
        *,
        api_key: str | None = None,
        auth_token: str | None = None,
        base_url: str | httpx.URL | None = None,
        timeout: float | Timeout | None | NotGiven = NOT_GIVEN,
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