Question

我有一个Tomcat 8 Web应用程序，它使用2 MB的png图像作为＆＃34;启动/登陆页面＆＃34;背景。图像在外部样式表中引用。

如果我清除浏览器缓存，直接请求图像的URL，但在加载之前离开图像，它将完全杀死我的Web应用程序。它无法再为任何请求提供任何响应。

我收到此错误：

org.apache.catalina.connector.ClientAbortException: java.io.IOException: Broken pipe
        at org.apache.catalina.connector.OutputBuffer.realWriteBytes(OutputBuffer.java:396)
        at org.apache.tomcat.util.buf.ByteChunk.append(ByteChunk.java:344)
        at org.apache.catalina.connector.OutputBuffer.writeBytes(OutputBuffer.java:421)
        at org.apache.catalina.connector.OutputBuffer.write(OutputBuffer.java:409)
        at org.apache.catalina.connector.CoyoteOutputStream.write(CoyoteOutputStream.java:97)
        at org.apache.catalina.servlets.DefaultServlet.copy(DefaultServlet.java:1795)
        at org.apache.catalina.servlets.DefaultServlet.serveResource(DefaultServlet.java:919)
        at org.apache.catalina.servlets.DefaultServlet.doGet(DefaultServlet.java:400)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
        at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:51)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
        at other.JsCssImgResponseHeaderFilter.doFilter(JsCssImgResponseHeaderFilter.java:36)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
        at other.CatchAnyExceptionFilter.doFilter(CatchAnyExceptionFilter.java:39)

我试图捕获该异常（或任何异常）并显示友好的ErrorPage.jsp，但我无法重定向到ErrorPage，因为响应已经提交。

我无法在测试环境中复制它，但我可以在生产中随意中断。

有谁知道我的选择是什么来解决这类问题？提前谢谢。

BTW，这是我的Filter类的doFilter方法：

    public void doFilter(ServletRequest req,
                     ServletResponse res,
                     FilterChain fc) throws IOException, ServletException
{
    HttpServletRequest request = (HttpServletRequest) req;
    HttpServletResponse response = (HttpServletResponse) res;
    HttpSession session = request.getSession();

    try
    {
        fc.doFilter(req, res);

        // Have learned that response headers should not be set until we have determined there won't be an exception.
        // Can't easily redirect or forward (to an error page, for example) if headers have already been committed.

        if (SessionHelper.hasNeedsJsCssImgResponseHeaderFlag(request))
        {
            Calendar cal = Calendar.getInstance();
            cal.add(Calendar.SECOND, JsCssImgResponseHeaderFilter.SECONDS_TO_CACHE);
            response.setHeader("Cache-Control", "PUBLIC, max-age=" + JsCssImgResponseHeaderFilter.SECONDS_TO_CACHE + ", must-revalidate");
            response.setHeader("Expires", DateUtils.getDateInExpiresHeaderFormat(cal.getTime()));
        }
        else if (SessionHelper.hasNeedsDynamicPageResponseHeaderFlag(request))
        {
            response.setHeader("Cache-Control", "no-cache");
            response.setHeader("Expires", "Mon, 25 Nov 2013 00:00:01 GMT");   // in the past
        }
        else if (SessionHelper.hasNeedsRestServicesResponseHeaderFlag(request))
        {
            // CORS - Cross Origin Resource Sharing: allow service requests from other domains -- 
            // such as local development domains hosting AngularJS projects.

            response.setHeader("Access-Control-Allow-Origin", "http://localhost.domain.com:8080");

            response.setHeader("Access-Control-Allow-Methods", "GET, POST, OPTIONS, PUT, DELETE");
            // response.setHeader("Access-Control-Allow-Methods", "*");

            response.setHeader("Access-Control-Allow-Headers", "Content-Type, X-Requested-With");
        }
    }
    catch (Exception e)
    {
        SessionHelper.setErrorPageException(req, session, e);
        final String uri = request.getRequestURI();
        final String playerName = SessionHelper.getLoggedInPlayerName(session);

        String outerLogEntryText = "Player = " + playerName + " - IP = " + request.getRemoteAddr() + 
                " - Mobile = " + SessionHelper.isMobileBrowser(request) +
                " - URI = " + uri + " - Exception MSG = " + e.getMessage();

        LogUtils.writeLogEntry(outerLogEntryText, true, e);
        SessionHelper.setRedirectPage(session, SessionHelper.ERROR_PAGE_PATH);
    }
    finally
    {
        String redirectPage = SessionHelper.getRedirectPage(session);
        SessionHelper.clearRedirectPage(session);

        if (redirectPage != null)
        {
            if (response.isCommitted())
            {
                // Article: http://stackoverflow.com/questions/11305563/cause-of-servlets-response-already-committed
                System.out.println("Response has been committed.  Cannot redirect to: " + redirectPage);
            }
            else
            {
                response.sendRedirect(redirectPage);
            }
        }
    }
}

问题发生时，我的响应已经提交......＆＃34;输出语句确实已写入，因此它不会重定向到我的错误页面。这就是我的挑战：当发生这种情况时如何重定向某个地方 - 或采取更好/无害的行动。

Answer 1

进行一些更改后，问题在生产中没有发生。最有影响力的变化是减小背景/启动图像的大小。另一个变化是我将Tomcat Connector connectionTimeout属性设置增加了6倍。

我该如何防止＆＃34;破管＃34;从我的tomcat网站上取下来？

1 个答案: