We will be taking the public PI Web API endpoint offline temporarily so we can upgrade it to our PI Web API 2016 R2 release. This downtime is scheduled to take place on Friday, January 13th 2017 at 10PM EST, and should take no more than half an hour.
We encourage you to share any thoughts or feedback about this new version here on PI Developers Club.
You can read more about our public PI Web API endpoint here: Public PI Web API endpoint
You can view the changelog for PI Web API 2016 R2 here: https://techsupport.osisoft.com/Documentation/PI-WEB-API/help/changelog/pi-web-api.html