https://github.com/oarrabi/exrequester

For example, this is a quick sample API Client.

    defmodule SampleAPI do
      use EXRequester

      @headers [
        Authorization: :auth,
        Accept: "application/json",
        "Accept-Language": "en-US"
      ]
      @get "/path/to/resource/{resource_id}"
      defreq get_resource(resource_id: resource_id, auth: auth)
    end

    SampleAPI.client("http://base_url.com")
    |> SampleAPI.get_resource(resource_id: 123, auth1: "1")