Ahhh I’m glad you posted this! We have much better error logs for these kinds of errors, so we can see exactly what caused it.
This error was the result of a failure to read the body from the request. We’re going to try to reproduce the problem. It could be a bug on our end, it might be something specific about how a browser is interacting with our proxy. It’s probably not your app.
Do you think it’s possible the user that hit this has a browser extension running that could modify requests, or is potentially running through a proxy server of some kind?