Incident resolved by Cloudfare: https://www.cloudflarestatus.com/incidents/652w59bvnbsj

Cloudflare has reported an issue with POST requests failing intermittently which may effect your Gaffa requests:
"Cloudflare is aware of and investigating an issue where some customers may be experiencing POST requests not reaching origin servers correctly. We are working to analyse and mitigate this problem. More updates to follow shortly."