Function fetchOnceWithKey

fetchOnceWithKey(
    url: string,
    key: string | undefined,
    ctx: IMFHttpContext,
): Promise<
    { kind: "ok"; text: string }
    | { kind: "error" | "auth"; error: Error },
>
Single direct-fetch attempt with one subscription key.
Parameters
- url: string
  Fully-qualified IMF SDMX URL.
- key: string | undefined
  Subscription key for this attempt, or undefined to send unauthenticated.
- ctx: IMFHttpContext
  HTTP context adapter.
Returns Promise<{ kind: "ok"; text: string } | { kind: "error" | "auth"; error: Error }>
'ok' with body text, 'auth' with the 401/403 error, or 'error' for everything else.
- Defined in mcp/imf/http-transport.ts:126