Elixir hello world example

examples/elixir_hello_world/lib/elixir_hello_world.ex

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+defmodule ElixirHelloWorld do
+  use Application.Behaviour
+
+  def start(_type, _args) do
+    dispatch = :cowboy_router.compile([
+                 {:_, [{"/", ElixirHelloWorld.TopPageHandler, []}]}
+               ])
+    {:ok, _} = :cowboy.start_http(:http, 100,
+                                  [port: 8080],
+                                  [env: [dispatch: dispatch]])
+    ElixirHelloWorld.Supervisor.start_link
+  end
+end

examples/elixir_hello_world/lib/elixir_hello_world/supervisor.ex

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+defmodule ElixirHelloWorld.Supervisor do
+  use Supervisor.Behaviour
+
+  def start_link do
+    :supervisor.start_link(__MODULE__, [])
+  end
+
+  def init([]) do
+    children = []
+    supervise children, strategy: :one_for_one
+  end
+end

examples/elixir_hello_world/lib/elixir_hello_world/top_page_handler.ex

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+defmodule ElixirHelloWorld.TopPageHandler do
+  def init(_transport, req, []) do
+    {:ok, req, nil}
+  end
+
+  def handle(req, state) do
+    {:ok, req} = :cowboy_req.reply(200, [], "Hello world!", req)
+    {:ok, req, state}
+  end
+
+  def terminate(_reason, _req, _state), do: :ok
+end