* @param contentType the content type
     * @return this
     */
    public Request withContent(String content, String contentType) {
        try {
            StringEntity stringEntity = new StringEntity(content);
            if (contentType != null) {
                stringEntity.setContentType(contentType);
            }
            return withEntity(stringEntity);
        } catch (UnsupportedEncodingException e) {
            throw new RuntimeException(e);
        }
    }