rohitg00/ai-engineering-from-scratch · error · ValueError

api_key must be non-empty

Error message

api_key must be non-empty

What it means

Error "api_key must be non-empty" thrown in rohitg00/ai-engineering-from-scratch.

Source

Thrown at certifications/claude/lessons/30-developer-application-capstone/code/main.py:44

class MessagesTransport(Protocol):
    """Small dependency-injection boundary for a Messages API call."""

    def create_message(self, payload: dict[str, Any]) -> dict[str, Any]: ...


class AnthropicMessagesHTTPTransport:
    """Opt-in stdlib HTTP transport that never logs or persists its API key."""

    def __init__(
        self,
        api_key: str,
        endpoint: str = ANTHROPIC_MESSAGES_URL,
        timeout_seconds: float = 30.0,
        opener: Callable[..., Any] = urllib.request.urlopen,
    ) -> None:
        if not api_key.strip():
            raise ValueError("api_key must be non-empty")
        self._api_key = api_key
        self.endpoint = endpoint
        self.timeout_seconds = timeout_seconds
        self._opener = opener

    def create_message(self, payload: dict[str, Any]) -> dict[str, Any]:
        body = json.dumps(payload).encode("utf-8")
        request = urllib.request.Request(
            self.endpoint,
            data=body,
            method="POST",
            headers={
                "content-type": "application/json",
                "anthropic-version": ANTHROPIC_VERSION,
                "x-api-key": self._api_key,
            },
        )
        try:

View on GitHub (pinned to 39ea8a1c6d)

When it happens

Trigger: Thrown at certifications/claude/lessons/30-developer-application-capstone/code/main.py:44 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of rohitg00/ai-engineering-from-scratch@39ea8a1c6d (2026-08-26). Data as JSON: /api/errors/62cd1b79373d2fe8. Report an issue: GitHub.