}

func headerValue(h http.Header, headerNames []string) string {
	for _, headerName := range headerNames {
		headerValue := h.Get(headerName)
		if len(headerValue) > 0 {
			return headerValue
		}
	}
	return ""
}

func allHeaderValues(h http.Header, headerNames []string) []string {
	ret := []string{}
	for _, headerName := range headerNames {
		headerKey := http.CanonicalHeaderKey(headerName)

        Map<String, String> entries = request.getHeaderNames().toList().collectEntries { headerName -> [headerName, request.getHeader(headerName as String)] }
        allHeaders.add(entries)
        String authorization = getAuthorizationHeader(request)
        if (authorization != null) {
            synchronized (authenticationAttempts) {

 *
 * ```
 * WWW-Authenticate: Digest ,foo=bar
 * WWW-Authenticate: Digest ,foo
 * ```
 */
fun Headers.parseChallenges(headerName: String): List<Challenge> {
  val result = mutableListOf<Challenge>()
  for (h in 0 until size) {
    if (headerName.equals(name(h), ignoreCase = true)) {
      val header = Buffer().writeUtf8(value(h))
      try {
        header.readChallengeHeader(result)