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plug_accesslog lib plug accesslog default_formatter query_string.ex
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lib/plug/accesslog/default_formatter/query_string.ex

defmodule Plug.AccessLog.DefaultFormatter.QueryString do
@moduledoc """
Logs the query string.
"""
@doc """
Formats the log output.
"""
@spec format(Plug.Conn.t()) :: iodata
def format(%{query_string: ""}), do: ""
def format(%{query_string: query}), do: ["?", query]
end