makeWebRequest worked with http, but now not with https, does INVALID_HTTP_BODY_IN_NETWORK_RESPONSE -400

Hi,

Because of Garmin not supporting http-Requests anymore, I had to change to https.

I changed my webservice an installed a SSL certificate on my Win10 PC.

In the simulator I get now a INVALID_HTTP_BODY_IN_NETWORK_RESPONSE  -400.

Why this?

You can check the webservice at https://fsmarin.mooo.com/SmappeeLocalWebApi/api/ActualPower?Smappee=http://fsmarin.mooo.com:20000

returning a JSON.  

[{"ConsumedPower":509,"SolarPower":1359,"Timestamp":"2019-09-22T14:32:47.8677179+02:00"}]

        Comm.makeWebRequest(
        	httpAddress,
            {
            },
            {
                "Content-Type" => Comm.REQUEST_CONTENT_TYPE_JSON
            },
            method(:onReceive)
        );

Do I have to set some parameters in the Webcall? (before with http, I did not set the Content-Type and it worked perfectly over month!)

Any help very appreciated

Marcel