https://angular.io/docs/ts/latest/guide/server-communication.html#!#in-mem-web-api
Angular’s http service delegates the client/server communication tasks to a helper service called the XHRBackend.
Using standard Angular provider registration techniques, the InMemoryWebApiModule replaces the default XHRBackend service with its own in-memory alternative. The forRoot method initialize the in-memory web API with seed data from the mock hero dataset at the same time.
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