I've got a custom connector and one action needs a special header
"Content-Type": "application/x-www-form-urlencoded"
so I defined it:

The test function works without error:

problem:
If I use this action i my PowerApp, the "Content-Type" is missing in the header and I get the error 415
{
"timestamp": "2019-10-04T18:59:26.658+0000",
"status": 415,
"error": "Unsupported Media Type",
"message": "Content type '' not supported",
"path": "/auth/token"
}
I've testet the header-parameter with
- visibility=internal (and "application/x-www-form-urlencoded" ist the default value)
- Visibility=non and transfer the "application/x-www-form-urlencoded" as a parameter to the action
Any ideas?
Frank