You can build your feature flags by leveraging the shared app state.

At runtime, you can override them using and overrides parameter in the url. The content of the overrides parameter is parsed and will be merged with the app state.

For instance, the url http://redhat.mateu.io/?overrides={"tenantId":"23"} will generate the following payload when calling the server:

{
  "appState": {
      "tenantId": "23",
      ...
  },
  ...
}

You can place anything you want, there. E.g. your feature flags.

If you pass an invalid json as the overrides parameter, like http://redhat.mateu.io/?overrides=xxx, it’s content will be sent as config in the appState objet as follows:

{
  "appState": {
      "config": "xxx",
      ...
  },
  ...
}