Body Cannot Send Content-Type application/json

Hi all

how to enable content-type : application/json 

this is our web application environment

with body request

we got result when our hit with postman like this

{

    "resourceType": "OperationOutcome",

    "issue": [

        {

            "severity": "error",

            "code": "invalid",

            "diagnostics": "<HSFHIRErr>InvalidContentType",

            "details": {

                "text": "The Content-Type 'application/json' is not supported."

            }

        }

    ]

}

what we have to do to make this request success, thanks for your help and time

Thanks,

Rizki Okta Alhadi