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How should I use alicloud MNS?

With pages that contain iframes, such as codesandbox, we should be able to access the Apollo Client instance for an embedded iframe.

See the-road-to-graphql/fullstack-apollo-express-postgresql-boilerplate#5 for users domain. Maybe someone wants to add tests for the messages domain too.

Intended outcome:
This is more a docs problem more than anything. The docs include a recipe for using TransferHttpCacheModule to cache requests when using SSR but it does not work as the module does not support POST requests and has no intention to support it. See [here](https://git

I believe this was handled by the wipe-if-demo script in the demo but I needed to manually run it in production since I removed that script from the Procfile. Not a huge deal but figured I would at least document it here to save someone else some time as it threw me for a little loop when I got the Postgres error.

Got the following error when I tried to register since the worker schema was