Usually, when you split your team and you are the Gateway-developer, you want to test your Gateway-services with the Gateway-service client (Transaction /IWFND/GW_CLIENT, but I prefer to go via the service maintenance /IWFND/MAINT_SERVICE).
If your team is working purely with JSON, you might want to view all the results also in JSON-Format.
To send data to the SAP Gateway (POST/PUT requests), you have to add the header
If you want the SAP Gateway to send the result to you in JSON-Format, you usually use the URL-Parameter $format=json
But this only works, if you make a GET request. For all the other requests, put in another header:
Then the SAP system will deliver JSON-Format to you, even for error messages etc.
This is my first blog here on SCN, yipieh 🙂