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httparrot

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https://github.com/edgurgel/httparrot

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httparrot lib httparrot headers_handler.ex
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lib/httparrot/headers_handler.ex 

defmodule HTTParrot.HeadersHandler do

  use HTTParrot.Cowboy, methods: ~w(GET HEAD OPTIONS)



  def content_types_provided(req, state) do

    {[{{"application", "json", []}, :get_json}], req, state}

  end



  def get_json(req, state) do

    headers = :cowboy_req.headers(req)

    {response(headers), req, state}

  end



  defp response(headers) do

    [headers: headers] |> JSX.encode!()

  end

end