} else if (value != null) {
                data.putValue(key, value.toString());
            }
        } catch (final Exception e) {
            if (logger.isDebugEnabled()) {
                logger.debug("Failed to put {}:{}", key, value, e);
            }
        }
    }

    /**
     * Decodes MIME-encoded text.
     *
     * @param value the encoded text to decode

        try {
            return xpathAPICache.get(Thread.currentThread().getName());
        } catch (final ExecutionException e) {
            if (logger.isDebugEnabled()) {
                logger.debug("Failed to retrieval a cache.", e);
            }
            return new XPathAPI();
        }
    }

    /**
     * Returns the header for the result data.
     * @return The result data header.
     */

     */
    public void addUrl(final String url) {
        try {
            urlQueueService.add(crawlerContext.sessionId, url);
        } catch (final Exception e) {
            logger.warn("Failed to add url: " + url, e);
        }
        urlFilter.processUrl(url);
    }

    /**
     * Returns the current session ID.
     * @return The session ID.
     */
    public String getSessionId() {

            }
            return requestDataList;
        } catch (final Exception e) {
            if (logger.isDebugEnabled()) {
                logger.debug("Failed to convert child URLs.", e);
            }
        }
        return requestDataList;
    }

    /**
     * Stores the response data content in the result data.
     *