Description goes here.
client application sends an access token request, providing 3 paramaters, grant_type, client id, and secret.
http://localhost:3000/oauth/token? grant_type=client_credentials& client_id=1b7b29722672ffa9b68951fd8dbb8bad& client_secret=b14090072a7261b02619b85c223787b756e5deda
server returns access_token in json format:
{"access_token":"1b7b29722672ffa9b68951fd8ddaa3f6","expires_in":3600}
then client can access resources by passing the access_token in parameter or header, see oauth header
http://localhost:3000/datap/?oauth_token=1b7b29722672ffa9b68951fd8ddaa3f6