Tomorrow (Weds Feb 4, 2020), Perma.cc will begin the process of deploying completely reimplemented support for timegates, timemaps, and memento-related headers on Perma Link/memento playbacks. Our timemaps, timegates, and memento-related headers have been broken since early last summer; we apologize for the frustration, and that it took us so long to address.
We expect the full re-indexing to take several hours, possibly up to a full day. During this time, Perma will initially return 404 for all timemap and timegate queries; partial results will be exposed in real time as the index is re-built. I'll post to this list again when it's complete.
Timemaps will subsequently be available at:
and timegates will be available at:
We will 301 redirect from the old routes to the new ones.
More details are below, if anyone is interested or might be tripped up by our changes.
If anyone has questions, concerns, recommendations, etc., just let me know!
Harvard Library Innovation Lab
In addition to addressing the various known bugs in our former implementation, we're making three changes of note:
We will therefore be returning 404 for a lot more timemap and timegate queries than we did in the past.
We may be able readdress this in the future, if we can implement support for isolated playback of individual assets within a Perma Link.
Only publicly-available Perma Links will be listed in timemaps or redirected to via timegates. Users should no longer uselessly get redirected to private, deleted, or potentially transient (e.g. less than 24-hours old, and still subject to user deletion) Perma Links. If, via a non-standard mechanism, a user encounters a playback of a Perma Link they would not be able to discover via a timemap or a timegate, that playback will NOT include headers like link or memento-datetime in the response, to avoid confusion.