private void processChallenges( final Map<String, Header> challenges, final AuthState authState, final AuthenticationHandler authHandler, final HttpResponse response, final HttpContext context) throws MalformedChallengeException, AuthenticationException { AuthScheme authScheme = authState.getAuthScheme(); if (authScheme == null) { // Authentication not attempted before authScheme = authHandler.selectScheme(challenges, response, context); authState.setAuthScheme(authScheme); } String id = authScheme.getSchemeName(); Header challenge = challenges.get(id.toLowerCase(Locale.ENGLISH)); if (challenge == null) { throw new AuthenticationException(id + " authorization challenge expected, but not found"); } authScheme.processChallenge(challenge); this.log.debug("Authorization challenge processed"); }