将授权用户直接重定向到所需的受保护资源。
Redirect an authorized user directly to the required protected resource.
成功确认之后，服务提供商颁发访问令牌来访问受保护资源。
Upon successful validation, the service provider issues the access token to access the protected resources.
RP 授予访问权：授予用户对受保护资源的访问权。
RP grants access: The user is granted access to the protected resource.
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