}
            writeContent(() -> {
                try {
                    if (con.getResponseCode() < 400) {
                        if (GZIP.equals(con.getContentEncoding())) {
                            return new GZIPInputStream(con.getInputStream());
                        } else {
                            return con.getInputStream();
                        }

            handshake();
        } catch (IOException ex) { }
        return connection.getContentType();
    }

    public String getContentEncoding() {
        try {
            handshake();
        } catch (IOException ex) { }
        return connection.getContentEncoding();
    }

    public long getExpiration() {
        try {
            handshake();
        } catch (IOException ex) { }

    public String getContentType () {
        handshake();
        return this.connection.getContentType();
    }


    @Override
    public String getContentEncoding () {
        handshake();
        return this.connection.getContentEncoding();
    }


    @Override
    public long getExpiration () {
        handshake();
        return this.connection.getExpiration();
    }