Validation History URI

[eby]

In addition to the PUT method to start a manual validity check it might be worthwhile to take a hint from cijoe and have a uri for last full validity check, independent of specific job. So it would return:

• 200 - OK (last check was successful)
• 412 - PRECONDITION FAILED (like cijoe) or 500 error??

Could include last modified headers for when job was completed.

A payload could be retrieved with specific errors.

[msmorul]

Should this information be added to the metadata returned when listing bags, rather than calling the validation url for each bag. It would also give 3rd parties a quick way to know which bags have been 'finished'