Issue with receiving empty HTTPs request bodies through proxy route

We’ve been using a proxy route to post data from Notehub to an IIS web interface on our servers. This has worked without issue for months, but suddenly on 2/3 at 11 am CST, the interface has only been receiving blank request bodies. It correctly receives and logs the headers of the notes, but the body is logged only as “ “. Nothing on the side of the interface should have changed for this issue to begin occurring, and I’ve been able to test with a webhook that Notehub is in fact sending the binary data. Did something change on the Notehub.io side of things that would have broken the interface’s ability to correctly parse and read request bodies?

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I did some snooping with Wireshark + switched the route to point towards http instead of https, to make my search easier. Looks like we are receiving the body of the request at our server, but the ASP .NET IIS is for some reason receiving an empty request body of length zero.