> For the complete documentation index, see [llms.txt](https://sigma-1.gitbook.io/notes/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://sigma-1.gitbook.io/notes/webdev/back-end.md).

# Back-End

## 授權

* [单点登录 SSO 的实现原理](http://blog.jobbole.com/92339/)