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HTTP 400 error when server fires a long http request to another server

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1

I have a scenario where I hit a cacheRefresh.do URL from an HTTP Client. It reaches App Server A, A refreshes its own cache and then sends a request (I am using URLConnection) to App Server B,to refresh its cache. (I know its a bad design, but we are out of option)

Now when my request is refresh small cache(small response time) , everything looks fine, I get a 200.

But when my request is to refresh large cache, I get a 400.

Server A and B do get refreshed in this case as well, but why do I get a 400 back as response? Any idea ?

Below is the controller code:

@SuppressWarnings("unused")
public ModelAndView handleRequest(final HttpServletRequest request, final HttpServletResponse response)
        throws Exception {

    final long cacheRefreshStartTime = System.currentTimeMillis();

    final String action = request.getParameter("action");
    // Init to 74 since this is the static length that will be appended.
    final StringBuffer result = new StringBuffer(74);
    final String[] cacheKeys = request.getParameterValues("cacheKeys");
    String[] cacheElement = request.getParameterValues("cacheElement");
    final String refreshByKeyRegion = request.getParameter("refreshByKeyRegion");
    final String refreshByKeyRegionKeys = request.getParameter("refreshByKeyRegionKeys");
    final String refreshPartnerInstanceCache = request.getParameter("refreshPartnerInstanceCache");
    LOG.debug(" cacheKeys for refresh " + Arrays.toString(cacheKeys));

    try {
        if (action.equalsIgnoreCase("ALL")) {
            performancLogger.info("Cache Refresh requested action=" + action);
            this.refreshAllCache();
        } else if (action.equalsIgnoreCase("SPECIFIC")) {
            performancLogger.info("Cache Refresh requested action=" + action + " keys="
                    + Arrays.toString(cacheKeys));
            this.refreshSpecificCache(cacheKeys);
        } else if (action.equalsIgnoreCase("cacheElement")) {
            if (refreshByKeyRegion != null && refreshByKeyRegion.length() > 0 && refreshByKeyRegionKeys != null
                    && refreshByKeyRegionKeys.length() > 0) {
                cacheElement = new String[] { refreshByKeyRegion + "," + refreshByKeyRegionKeys };
            }
            performancLogger.info("Cache Refresh requested action=" + action + " element="
                    + Arrays.toString(cacheElement));
            this.refreshCacheElements(cacheElement);
        }
        if (!request.getServerName().contains("localhost") && refreshPartnerInstanceCache != null
                && refreshPartnerInstanceCache.equals("true")) {
            refreshPartnerInstanceCache(request);
        }
        result.append("Cache refresh completed successfully.");

        if (cacheKeys != null) {
            result.append(" Keys - ");
            result.append(this.formatArrayAsString(cacheKeys));
        }
    } catch (final Exception e) {
        result.append("Cache refresh failed.");
        if (cacheKeys != null) {
            result.append(" Keys - ");
            result.append(this.formatArrayAsString(cacheKeys));
        }
    }

    if (action != null) {
        performancLogger.info("Cache Refresh competed total refresh time = "
                + formatElapsedTime(System.currentTimeMillis() - cacheRefreshStartTime));
    }

    return new ModelAndView(IVRControllerNames.CACHE_REFRESH_STANDARD_VIEW, "displayInfo", this
            .getDisplayInfo(result));
}

Request Header:

POST xxxxx.do HTTP/1.1
Host: xxxxx
User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.2.3) Gecko/20100401 Firefox/3.6.3
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: en-us,en;q=0.5
Accept-Encoding: gzip,deflate
Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7
Keep-Alive: 115
Connection: keep-alive
Referer: http://xxx/yyy/zzz/cacheView.do
Cookie: JSESSIONID=xxxxx.x.x

Request Body:

Content-Type: application/x-www-form-urlencoded 
Content-Length: 134 
action=SPECIFIC&refreshPartnerInstanceCache=true&cacheKeys=xxxx&cacheKeys=xxx&Refresh=yyyy

Thanks!

2012-04-05 19:56
by user620339
could you post some code of your request and what AppServers do with it - Plínio Pantaleão 2012-04-09 18:57
@PlínioPantaleão: code snippets added above in the question.Keep in mind, if I send a request to only refresh 2 or 3 caches, it works fine. but if I request for a long processing (like refresh 7-8 or more caches). That's when I am facing this issue. I believe it has something to do with my initial request getting timedout or something, not sure - user620339 2012-04-09 21:00

0

In your action you seem to have several keys with the same name.

action=SPECIFIC&refreshPartnerInstanceCache=true&**cacheKeys**=xxxx&**cacheKeys**=xxx&Refresh=yyyy

Clean it up and give them unique IDs.

Also, they do not seem to be urlencoded which may cause trouble if your keys contain funny characters. See How to escape URL-encoded data in POST with HttpWebRequest

2012-04-16 14:33
by jornare
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