获取r_basicprofile vanityName

Question

我正在尝试使用LinkedIn API获取用户个人资料链接，这是我得到的：

firstName:"..."
formattedName: "..."
id: "..."
lastName: "..."
pictureUrl: "..."
email: "..."
firstName: "..."
first_name: "..."
formattedName: "..."
id: "..."
lastName: "..."
last_name: "..."
name: "..."
pictureUrl: "..."
thumbnail: "..."

在文档中它说在basicprofile中我应该得到vanityName但它不存在？ 如何获取用户个人资料链接？