o.apache.coyote.http11.Http11Processor   : Error parsing HTTP request header

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

java.lang.IllegalArgumentException: Invalid character found in method name. HTTP method names must be tokens

    at org.apache.coyote.http11.Http11InputBuffer.parseRequestLine(Http11InputBuffer.java:422)

    at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:683)

    at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)

    at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:861)

    at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1455)

    at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)

    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)

    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)

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

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

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:

<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"/>
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"/>

http://www.cnblogs.com/yuananyun/p/6501324.html

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