昨天生产环境有用户反馈页面操作报错，根据用户发过来的截图来看报错信息如下：
错误信息
This page can't be displayed. Contact support for additional information. The incident ID is: 5906352683740581956.
这个消息以前从来没见过，看上去也不像是由于JS报错引起，比较像是向服务端请求时抛出来的异常，并且在生产的模拟环境下无法重现。思来想去不得其解，无奈之下想起求助于google。
遇到这个问题的人还不少，但是都没有明确表示到得了解决。看了好几个回答，感觉比较靠谱的说法是和firewall有关。后来看到一篇Tomcat-User上的问答，在最后终于看到一段比较像那么回事的回答：
Tomcat - User 上的回答
That response looks like an F5 firewall response message.
Usually this happens due to the web service inadvertently submitting an attack / illegal signature due to - Header size, number of headers, restricted header type, restricted verb or and body size.
Speak with the guys that manage the F5, give them the message ID and they will pin point the exact issue in the F5 logs.
Usually this happens due to the web service inadvertently submitting an attack / illegal signature due to - Header size, number of headers, restricted header type, restricted verb or and body size.
Speak with the guys that manage the F5, give them the message ID and they will pin point the exact issue in the F5 logs.
附上原文地址：http://tomcat.10.x6.nabble.com/Information-about-incident-ID-2205106170494020972-td5048945.html
然而我并不知道F5是神马。。与DM沟通了一下问题可能与防火墙有关，在说到F5时他愣了一下：“F5”？
原来前一天刚部署了F5 Balance，上面确实带有防火墙。于是和相关TS联系了一下，得到的反馈证实了我们的判断。
TS的反馈
For this Error from WAF because this action got a lot of parameter send to server and now I've done the exception already, please try again.
以上，这个妖异的问题得到了解决，在此记下。
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