Integration with web servers
We can use Plug.Cowboy in a similar way to Chapter 3 to build a server that dispatches the GET /greet calls to the ExampleController module. Let’s start by creating an iex session with the goldcrest app loaded. We can then require the example router and controller files to use them as part of our HTTP server:
$ iex -S mix
iex> Code.require_file("./lib/goldcrest/support/example_controller.ex")
iex> Code.require_file("./lib/goldcrest/support/example_router.ex")
iex> Mix.install([{:plug_cowboy, "~> 2.0"}])
iex> opts = [
...> scheme: :http,
...> plug: Goldcrest.ExampleRouter,
...> options: [port: 4040]
...> ]
iex> %{start: {mod, fun, args}} = Plug.Cowboy.child_spec(opts)
iex> apply(mod, fun, args)
{:ok, #PID<_,_,_>}
Calling the preceding list of functions from iex starts a Cowboy HTTP server on port 4040. We can now use curl to...
