name := headerValue(req.Header, a.nameHeaders.Value())
	if len(name) == 0 {
		return nil, false, nil
	}
	groups := allHeaderValues(req.Header, a.groupHeaders.Value())
	extra := newExtra(req.Header, a.extraHeaderPrefixes.Value())

	// clear headers used for authentication
	ClearAuthenticationHeaders(req.Header, a.nameHeaders, a.groupHeaders, a.extraHeaderPrefixes)

	return &authenticator.Response{

  _cgoexp_[0-9a-z]+_goCallback\(\)
      .*_cgo_gotypes\.go:[0-9]+ \+0x[0-9,a-f]+
  _cgoexp_[0-9a-z]+_goCallback\(\)
      <autogenerated>:1 \+0x[0-9,a-f]+

Goroutine [0-9] \(running\) created at:
  runtime\.newextram\(\)
      .*/runtime/proc.go:[0-9]+ \+0x[0-9,a-f]+
==================`,
		`==================
WARNING: DATA RACE
Read at 0x[0-9,a-f]+ by .*:
  main\..*
      .*/main\.go:[0-9]+ \+0x[0-9,a-f]+(?s).*