Demoing ReqFiddler

Mix.install([
  {:req, "~> 0.5.8"},
  {:req_fiddler, github: "chgeuer/req_fiddler"}
  # {:req_fiddler, path: "/mnt/c/github/chgeuer/req_fiddler"}
], force: true)

Section

Req.new()
|> ReqFiddler.attach()
|> Req.merge(method: :get, url: "https://hex.pm/")
|> Req.request!() 

defmodule UrlParser do
  def extract_host_port(url) when is_binary(url) do
    Regex.run(~r{(https?://|https?=)([^:]+):(\d+)}, url)
    |> case do
      [_, _protocol, host, port] -> {host, String.to_integer(port)}
      nil -> nil
    end
  end
end

"\r\nHKEY_CURRENT_USER\\Software\\Microsoft\\Windows\\CurrentVersion\\Internet Settings\r\n    ProxyServer    REG_SZ    http=localhost:4000\r\n\r\n"
|> String.trim()
|> String.split("\r\n")
|> Enum.at(-1)
|> (&Regex.run(~r/^\s*ProxyServer\s+REG_SZ\s+(.*)/, &1)).()
|> Enum.at(-1)
|> UrlParser.extract_host_port()
|> dbg()