this.credentials = credentials;
    }

    /*
     * (non-Javadoc)
     *
     * @see org.codelibs.fess.crawler.client.http.Authentication#getAuthScheme()
     */
    @Override
    public AuthScheme getAuthScheme() {
        return authScheme;
    }

    /**
     * Sets the authentication scheme.
     * @param authScheme The authentication scheme to set.
     */

     *
     * @return the authentication scheme
     */
    /**
     * Retrieves the authentication scheme to be used for HTTP requests.
     *
     * @return the authentication scheme
     */
    AuthScheme getAuthScheme();

            final AuthScope authScope = authentication.getAuthScope();
            credentialsProvider.setCredentials(authScope, authentication.getCredentials());
            final AuthScheme authScheme = authentication.getAuthScheme();
            if (authScope.getHost() != null && authScheme != null) {
                final HttpHost targetHost = new HttpHost(authScope.getHost(), authScope.getPort());
                authCache.put(targetHost, authScheme);

        final List<Pair<FormScheme, Credentials>> formSchemeList = new ArrayList<>();
        for (final Authentication authentication : siteCredentialList) {
            final AuthScheme authScheme = authentication.getAuthScheme();
            if (authScheme instanceof FormScheme) {
                formSchemeList.add(new Pair<>((FormScheme) authScheme, authentication.getCredentials()));
            } else {