当服务器向另一台服务器发起长HTTP请求时出现HTTP 400错误

我有一个场景，我从HTTP客户端中点击了一个cacheRefresh.do URL。它到达App Server A，刷新其自己的缓存，然后向App Server B发送请求（我正在使用URLConnection）来刷新其缓存。（我知道它的一个不好的设计，但我们走出选项）当服务器向另一台服务器发起长HTTP请求时出现HTTP 400错误

现在，当我的要求是刷新小的高速缓存（小响应时间），一切都看起来不错，我得到一个200

但是，当我的请求是刷新大缓存，我得到一个400.

服务器A和B在这种情况下也得到刷新，但为什么我得到一个400作为回应？任何想法？

下面是控制器代码：

@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)); 
}

请求头：

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

请求正文：

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

谢谢！

来源

2012-04-05 user620339

您可以发布您的请求的一些代码以及AppServers用它做什么？ – 2012-04-09 18:57:19

@PlínioPantaleão：在问题中添加了以上代码片段。请记住，如果我发送请求以仅刷新2或3个缓存，则它可以正常工作。但如果我请求长时间处理（如刷新7-8或更高的缓存）。那是我面临这个问题的时候。我相信这与我最初的请求获得超时或某事有关，不确定？ – user620339 2012-04-09 21:00:27

在你的动作中，你似乎有几个同名的键。

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

清理它并给它们唯一的ID。

此外，它们似乎不是urlencoded，如果您的键包含有趣的字符可能会导致麻烦。请参阅How to escape URL-encoded data in POST with HttpWebRequest

来源

2012-04-16 14:33:20 jornare

当服务器向另一台服务器发起长HTTP请求时出现HTTP 400错误

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