public void incrementContentLength(int additionalContentLength) {
        String cl = headers.get(CONTENT_LENGTH);
        if (cl != null && cl.length() > 0) {
            int clength = new Integer(cl).intValue();
            headers.put(CONTENT_LENGTH, String.valueOf(clength + additionalContentLength));
        }
    }
@param additionalContentLength the additional content length
plugins/jsonp-policy/src/main/java/io/apiman/plugins/jsonp_policy/http/HttpHeaders.java