OAuth2Client

const (
	// AuthStyleInParams sends the "client_id" and "client_secret"
	// in the POST body as application/x-www-form-urlencoded parameters.
    // client_secret_post
	AuthStyleInParams AuthStyle = 1

	// AuthStyleInHeader sends the client_id and client_password
	// using HTTP Basic Authorization. This is an optional style
	// described in the OAuth2 RFC 6749 section 2.3.1.
    // client_secret_basic
	AuthStyleInHeader AuthStyle = 2
)