メソッド名に無効な文字が見つかりました。HTTPメソッド名はトークンでなければなりません

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August 15, 2017 10:21:08 AM org.apache.coyote.AbstractProtocol start
Info: Starting ProtocolHandler ["http-nio-8080"]
August 15, 2017 10:21:08 AM org.apache.coyote.AbstractProtocol start
Message: Starting ProtocolHandler ["ajp-nio-8009"]
August 15, 2017 10:21:08 AM org.apache.catalina.startup.Catalina start
Message: Server startup in 24549 ms
August 15, 2017 10:21:44 AM org.apache.coyote.http11.AbstractHttp11Processor process
Message: 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.AbstractNioInputBuffer.parseRequestLine(AbstractNioInputBuffer.java:232)
	at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1013)
	at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:687)
	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1520)
	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1476)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
	at java.util.concurrent.ThreadPoolExecutor$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)

server.xmlにmaxHttpHeaderSizeフィールドを追加するだけです。

<Connector URIEncoding="UTF-8" port="8080" protocol="org.apache.coyote.http11.Http11NioProtocol"
    useBodyEncodingForURI="false"
    enableLookups="false"
               connectionTimeout="20000"
               redirectPort="8443" maxHttpHeaderSize="the size you want"/>

 <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"/>

 <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"/>