}
        return doHttpMethod(url, httpGet);
    }

    /*
     * (non-Javadoc)
     *
     * @see org.codelibs.fess.crawler.http.HttpClient#doHead(java.lang.String)
     */
    @Override
    public ResponseData doHead(final String url) {
        HttpUriRequest httpHead;
        try {
            httpHead = new HttpHead(url);
        } catch (final IllegalArgumentException e) {

        }
        return doHttpMethod(url, httpGet);
    }

    /*
     * (non-Javadoc)
     *
     * @see org.codelibs.fess.crawler.http.HttpClient#doHead(java.lang.String)
     */
    @Override
    public ResponseData doHead(final String url) {
        ClassicHttpRequest httpHead;
        try {
            httpHead = new HttpHead(url);
        } catch (final IllegalArgumentException e) {

         * in sbuf will be preserved for copying into BUF in doRecv().
         */

        return (long) Encdec.dec_uint16le(this.sbuf, 34) & 0xFFFF;
    }

    @Override
    protected void doSend(final Request request) throws IOException {

        CommonServerMessageBlock smb = (CommonServerMessageBlock) request;
        final byte[] buffer = this.getContext().getBufferCache().getBuffer();
        try {