tomcat报错调试：

Jun 12, 2016 4:19:43 PM org.apache.coyote.http11.AbstractHttp11Processor process

INFO: Error parsing HTTP request header

 Note: further occurrences of HTTP header parsing errors will be logged at DEBUG level.

java.lang.ArrayIndexOutOfBoundsException: -64

at org.apache.coyote.http11.InternalInputBuffer.parseHeader(InternalInputBuffer.java:341)

at org.apache.coyote.http11.InternalInputBuffer.parseHeaders(InternalInputBuffer.java:271)

at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1007)

at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:625)

at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:316)

at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)

at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)

at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)

at java.lang.Thread.run(Thread.java:745)

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:

<Connector URIEncoding="UTF-8" port="8080" protocol="org.apache.coyote.http11.Http11NioProtocol"
useBodyEncodingForURI="false"
enableLookups="false"
              connectionTimeout="20000"

              redirectPort="8443" maxHttpHeaderSize="你想要的大小"/>

tomcat常用配置注释：

maxHttpHeaderSize="8192" http请求头信息的最大程度，超过此长度的部分不予处理。一般8K。 
URIEncoding="UTF-8" 指定Tomcat容器的URL编码格式。 
disableUploadTimeout="true" 上传时是否使用超时机制 
enableLookups="false"--是否反查域名，默认值为true。为了提高处理能力，应设置为false 
compression="on"   打开压缩功能 
compressionMinSize="10240" 启用压缩的输出内容大小，默认为2KB 
noCompressionUserAgents="gozilla, traviata"   对于以下的浏览器，不启用压缩 
compressableMimeType="text/html,text/xml,text/javascript,text/css,text/plain" 哪些资源类型需要压缩 

tomcat配置示例：

配置示例 
<Connector port="8080" 
redirectPort="8443"
maxThreads="150" 
minSpareThreads="25" 
maxSpareThreads="75" 
acceptCount="100" 
connectionTimeout="20000" 
protocol="HTTP/1.1" 

maxHttpHeaderSize="8192" 
URIEncoding="UTF-8" 
disableUploadTimeout="true" 
enableLookups="false" 
compression="on" 
compressionMinSize="10240" 
noCompressionUserAgents="gozilla, traviata" 
compressableMimeType="text/html,text/xml,text/javascript,text/css,text/plain"> 
... 
</Connector>

本文转自 蔡小赵 51CTO博客，原文链接:http://blog.51cto.com/zhaopeiyan/1788319