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官方详细资料：http://wiki.opensns.qq.com/wiki/%E3%80%90QQ%E7%99%BB%E5%BD%95%E3%80%91%E5%BC%80%E5%8F%91%E6%94%BB%E7%95%A5_Server-side#Step4.EF.BC.9A.E4.BD.BF.E7.94.A8Access_Token.E6.9D.A5.E8.8E.B7.E5.8F.96.E7.94.A8.E6.88.B7.E7.9A.84OpenID