在服务器的搭建的环境： centos 64 位。 nginx+passenger

在请求的时候，偶尔会报错，由到用的阿里云，一报错就提示说可能是因为没备案。 在页面上看不到其他的错误信息。

查看 nginx 的日志，发现在 error.log 日志中，有下面的日志：

[ pid=1371 thr=140574286247680 file=ext/nginx/HelperAgent.cpp:923 time=2012-11-14 15:23:25.509 ]: Couldn't forward the HTTP response back to the HTTP client: It seems the user clicked on the 'Stop' button in his browser.
[ pid=1371 thr=140574285846272 file=ext/nginx/HelperAgent.cpp:923 time=2012-11-14 15:25:51.697 ]: Couldn't forward the HTTP response back to the HTTP client: It seems the user clicked on the 'Stop' button in his browser.
[ pid=1371 thr=140574285645568 file=ext/nginx/HelperAgent.cpp:923 time=2012-11-14 15:25:55.28 ]: Couldn't forward the HTTP response back to the HTTP client: It seems the user clicked on the 'Stop' button in his browser.
[ pid=1371 thr=140574285444864 file=ext/nginx/HelperAgent.cpp:923 time=2012-11-14 15:25:56.241 ]: Couldn't forward the HTTP response back to the HTTP client: It seems the user clicked on the 'Stop' button in his browser.
[ pid=1371 thr=140574285244160 file=ext/nginx/HelperAgent.cpp:923 time=2012-11-14 15:25:57.84 ]: Couldn't forward the HTTP response back to the HTTP client: It seems the user clicked on the 'Stop' button in his browser.

每次异常的时候，都会打印一次这样的日志。 不知道各位有没有碰到过类似的情况？如何解决？