In Mendix 8, the HttpRequest/Content is left empty when the Content-Type is multipart/form-data.
You can handle these type of requests in two ways:
If you set the log to trace what does the logs tell you? Because to me this looks like the other party is at fault here. I can not think of any reason why something on the Mendix end would strip the content. But the logs might tell you something here.
Regards,
Ronald
Why are you using form-data instead of json via raw json or export mapping?
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I had the same issue in the past. You need to set your headers (Content-Type and Accept) properly. Also define your body in a correct way, with a correct match to your headers. E.g. if your content-type is application/x-www-form-urlencoded, then you need to set the custom template with an & separated key/value string.