I'm not sure what's happened but as of around mid-day lots of things stopped working for me that had been working OK for years: Certain http POST requests to my imp agent are being received as method="GET"!
These requests are all variously sourced from my home network (e.g. Raspberry Pi, ESP8266 and manual testing using the Postman app) The only external POST requests I have are coming in from Amazon servers - and they are received OK as method="POST". This is really puzzling me now. I very much doubt that it's a problem with the imp servers but I'm stuck for ideas on how to go about figuring out what's happening.