I am always getting JSON response for my HTTP request to access one ORDS-Oracle Rest Data Services API:

However my requirement is to get XML response. I tried to choose XML from drop down list available at POSTMAN, however content is not changing to XML.
I need a way to specify parameter as part of HTTP URL so that response is XML than JSON and I tried to change URL like below:

However nothing is working and response is always JSON. Any suggestion?
Thanks,