YouTube.com, and by extension the YouTube API, will be in read-only
mode on Monday, April 12 starting at 7:00pm PDT. This should last for
approximately 4 to 5 hours.
YouTube API calls that create or update metadata or videos will fail
during this period of time. As a best practice, we recommend making
sure your code gracefully handles service errors on POST/PUT/DELETE
operations:
Cheers,
-Jeff Posnick, YouTube API Team