The issue was resolved at 1804hrs UTC, after a period of 40 minutes. The cause was a misconfiguration error in newly deployed code for improving cache logic. Additional automated and manual checks have been implemented, to prevent this from recurring.

Sirv CDN experienced an issue whereby approximately 7% of non-cached requests (<1% of all requests) returned an empty 200 response. Most requests were for cached files, which were unaffected.