linkshttps://github.com/akka/akka-http/blob/master/docs/src/test/scala/docs/http/scaladsl/server/directives/JsonStreamingExamplesSpec.scalahttps://gist.github.com/jeroenr/5261fa041d592f37cd80https://github.com/underscoreio/shapeless-guide-code/blob/exercises/json/src/main/scala/json.scala