A link that downloads one sandbox file with no LangSmith credential.
The link is pinned to the sandbox, the file path, and the response headers, so it cannot be repointed at another file. It is pinned to the path rather than to a snapshot of the contents, so the file must not be modified while the link is in use.
interface DownloadURLThe full URL to fetch. Supports GET, HEAD, and Range.
Expiry timestamp, or null for a link that never expires.
The signed token embedded in download_url.