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hermes_mcp

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Model Context Protocol (MCP) implementation in Elixir with Phoenix integration

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hermes_mcp lib hermes http.ex
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lib/hermes/http.ex 

defmodule Hermes.HTTP do

  @moduledoc """

  HTTP utilities.

  """



  require Logger



  @default_headers %{

    "content-type" => "application/json"

  }



  def build(method, url, headers \\ %{}, body \\ nil, opts \\ []) do

    with {:ok, uri} <- parse_uri(url) do

      Finch.build(method, uri, Map.to_list(headers), body, opts)

    end

  end



  @doc """

  Performs a POST request to the given URL.

  """

  def post(url, headers \\ %{}, body \\ nil) do

    headers = Map.merge(@default_headers, headers)

    build(:post, url, headers, body)

  end



  defp parse_uri(url) when is_binary(url) do

    with {:error, _} <- URI.new(url), do: {:error, :invalid_url}

  end



  @max_redirects 3



  def follow_redirect(%Finch.Request{} = request, attempts \\ @max_redirects) do

    with {:ok, resp} <- Finch.request(request, Hermes.Finch),

         do: do_follow_redirect(request, resp, attempts)

  end



  defp do_follow_redirect(_req, _resp, 0), do: {:error, :max_redirects}



  defp do_follow_redirect(req, %Finch.Response{status: 307, headers: headers}, attempts) do

    location = List.keyfind(headers, "location", 0)



    Logger.info("Following redirect to: #{location}, attempts left: #{attempts}")



    {:ok, uri} = URI.new(location)

    req = %{req | host: uri.host, port: uri.port, path: uri.path}

    follow_redirect(req, attempts - 1)

  end



  defp do_follow_redirect(_req, %Finch.Response{} = resp, _attempts), do: {:ok, resp}

end