Documentation about token refresh (code flow) not found

[michaelbe812]

Describe the bug
Not sure if bug report fits well. It's kinda documentation bug.

Referring to the documentation about silent-refresh, the link to token refresh leads to a 404: https://manfredsteyer.github.io/angular-oauth2-oidc/docs/additional-documentation/token-refresh.md

To Reproduce
Steps to reproduce the behavior:

1. Go to https://manfredsteyer.github.io/angular-oauth2-oidc/docs/additional-documentation/silent-refresh.html
2. Click on 'Token Refresh'

Expected behavior
The documentation about token refresh using code flow should be shown

[michaelbe812]

PR submitted: #1130

[lf-novelt]

I also struggled to implement the refresh_token flow properly, check how I did in my issue #1146 in the app.component.ts

Basic idea

• check if access_token is still valid
• check if refresh_token exists (if (this.authSvc.getRefreshToken())
  • if yes, remove invalid access_token to prevent the interceptor from using it and getting errors.
  • refresh the token with this.authSvc.refreshToken().catch(() => this.redirectToLogin())
  • catch any error in case refreshToken is expired -> redirect to login