Resolve a Wayback Machine snapshot URL

Queries the Internet Archive availability API (http://archive.org/wayback/available) for the closest archived snapshot of url and returns a directly-downloadable snapshot URL, or NULL if no snapshot exists or the lookup fails. This is the shared fetch failsafe the wider morie package family relies on: callers attempt the live source first and fall back to this snapshot when the source is unreachable.

Usage

wayback_snapshot_url(url, timestamp = NULL)

Arguments

url

The original source URL to look up.

timestamp

Optional 14-digit YYYYMMDDhhmmss target; the API returns the snapshot closest to it. Defaults to the most recent.

Value

A character scalar snapshot URL, or NULL.