【Web】Django OAuth invalid_grant error

This can happen if the code is expired. They expire pretty quickly by default. You can look up your code in the Django admin under Grants and change the expiration date to far in the future.

原因：

Django OAuth Toolkit  默认的Grant过期时间非常短暂。

Django使用django-oauth-toolkit无法使用json格式进行Oauth2认证：http://www.tuicool.com/articles/7ryYfuq

在django中实现QQ登录:http://www.oschina.net/question/565065_69148

放置“QQ登录”按钮：_OAuth2.0：http://wiki.open.qq.com/wiki/website/%E6%94%BE%E7%BD%AE%E2%80%9CQQ%E7%99%BB%E5%BD%95%E2%80%9D%E6%8C%89%E9%92%AE_OAuth2.0

开发攻略_Server-side ：http://wiki.open.qq.com/wiki/website/%E5%BC%80%E5%8F%91%E6%94%BB%E7%95%A5_Server-side

参考资料：

http://stackoverflow.com/questions/27056272/django-oauth-toolkit-invalid-grant-error