final HttpContext context) throws MalformedChallengeException {
Args.notNull(challenges, "Map of auth challenges");
Args.notNull(authhost, "Host");
Args.notNull(response, "HTTP response");
Args.notNull(context, "HTTP context");
final HttpClientContext clientContext = HttpClientContext.adapt(context);
final Queue<AuthOption> options = new LinkedList<AuthOption>();
final Lookup<AuthSchemeProvider> registry = clientContext.getAuthSchemeRegistry();
if (registry == null) {
this.log.debug("Auth scheme registry not set in the context");
return options;
}
final CredentialsProvider credsProvider = clientContext.getCredentialsProvider();
if (credsProvider == null) {
this.log.debug("Credentials provider not set in the context");
return options;
}
final RequestConfig config = clientContext.getRequestConfig();
Collection<String> authPrefs = getPreferredAuthSchemes(config);
if (authPrefs == null) {
authPrefs = DEFAULT_SCHEME_PRIORITY;
}
if (this.log.isDebugEnabled()) {