Openid connect userinfo

The OpenID Connect API interface is a standard. Attempting to access userinfo of Corteza with:

http://localhost:18080/auth/oauth2/userinfo

via Postman by the “POST” method results in an error 405 “Method not allowed”. When using the GET method, the response is an HTML page that javascript is not enabled. To my knowledge, the “POST” method is the standard here.
Any idea?