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combo lib combo proxy error_plug.ex
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lib/combo/proxy/error_plug.ex

defmodule Combo.Proxy.ErrorPlug do
@moduledoc false
import Plug.Conn
require Logger
@behaviour Plug
@impl true
def init(opts) do
opts
end
@impl true
def call(conn, _opts) do
conn
|> resp(404, "No backends matched")
|> send_resp()
end
end