java.lang.IllegalArgumentException: Invalid character found in the request target.

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Note: further occurrences of HTTP header parsing errors will be logged at DEBUG level.java.lang.IllegalArgumentException: Invalid character found in the request target. The valid characters are defined in RFC 7230 and RFC 3986at org.apache.coyote.http11.InternalNioInputBuffer.parseRequestLine(InternalNioInputBuffer.java:317)at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1028)at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:637)at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1770)at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1729)at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)at java.util.concurrent.ThreadPoolExecutor$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)1. 问题可能是因为tomcat配置的缓冲区大小不够, 修改tomcat/conf/server.xml文件.<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"/>2. 查看你的请求是否是POST请求, 如果是GET请求方式, 请修改成POST测试;3. 修改tomcat/conf/catalina.properties的配置文件Tomcat在 7.0.73, 8.0.39, 8.5.7 版本后，添加了对于http头的验证。具体来说，就是添加了些规则去限制HTTP头的规范性org.apache.tomcat.util.http.parser.HttpParser#IS_NOT_REQUEST_TARGET[]中定义了一堆not request targetif(IS_CONTROL[i] || i > 127 || i == 32 || i == 34 || i == 35 || i == 60 || i == 62 || i == 92 || i == 94 || i == 96 || i == 123 || i == 124 || i == 125) {IS_NOT_REQUEST_TARGET[i] = true;}转换过来就是以下字符(对应10进制ASCII看):键盘上那些控制键:(<32或者=127)非英文字符(>127)空格(32)双引号(34)#(35)<(60)>(62)反斜杠(92)^(94)TAB上面那个键,我也不晓得嫩个读(96){(123)}(124)|(125) 解决办法：配置tomcat的catalina.properties添加或者修改：tomcat.util.http.parser.HttpParser.requestTargetAllow=|{}
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