404. That’s an error.

The requested URL /_/+1/confirm?hl=en&url=http%3A%2F%2Fsdtimes.com%2Fcross-origin-resource-sharing-on-track-to-become-a-w3c-recommendation%2F&title=Cross-origin+resource+sharing+on+track+to+become+a+W3C+Recommendation was not found on this server. That’s all we know.