WEB_FETCH_FAILED
HTTP 502Auto-retry
NEW code. The web vendor could not fetch / search the target (upstream error or unreachable URL). Retry with backoff.
By default a failed call returns a result with an error instead of throwing, so your business flow is never interrupted.
Rate-limit and upstream errors are retried automatically with backoff, honoring the Retry-After header.
Published error codes are permanent: their meaning never silently changes, and deprecated codes keep returning for at least 12 months.