class Faraday::Response::RaiseError

def on_complete(env)
  return if Array(options[:allowed_statuses]).include?(env[:status])
  case env[:status]
  when *ClientErrorStatusesWithCustomExceptions.keys
    raise ClientErrorStatusesWithCustomExceptions[env[:status]], response_values(env)
  when 407
    # mimic the behavior that we get with proxy requests with HTTPS
    msg = %(407 "Proxy Authentication Required")
    raise Faraday::ProxyAuthError.new(msg, response_values(env))
  when ClientErrorStatuses
    raise Faraday::ClientError, response_values(env)
  when ServerErrorStatuses
    raise Faraday::ServerError, response_values(env)
  when nil
    raise Faraday::NilStatusError, response_values(env)
  end
end