sso

SSO architecture:
1---authentication center
2---user and account system, user data acquisition interface
3---client module
4---token (token)

single sign-on:
business resource request, determine whether the token exists , whether the token is valid, and the
resource is successfully accessed.

If the token does not exist, the request will be redirected to the SSO authentication page, and the user is required to
authorize .

Carry the token to initiate the service resource request again.