阿里云上弄了一个tomcat，经常半夜发送崩溃，查看日志发现这个东西，查阅资料发现是Tomcat的header缓冲区大小不够,只需要在server.xml中增加maxHttpHeaderSize字段即可:

如：

   <Connector port="8080" executor="tomcatThreadPool"

     protocol="HTTP/1.1"

     maxThreads="1000"

     maxHttpHeaderSize="8192"

     minSpareThreads="100"

     maxSpareThreads="200"

     acceptCount="1000"

     maxConnections="1000"

     connectionTimeout="30000"

     keepAliveTimeout="15000"

     maxKeepAliveRequests="1"

      tcpNoDelay="true"

     redirectPort="8443"

     enableLookups="false"

     URIEncoding="UTF-8"/>