运维系列（5）异常Invalid character found in the request target. The valid characters are defined in RFC 3986

tomcat url请求400错误(%2F与%5C)

错误原因：url中参数部分包含/，默认tomcat是不支持url参数包含: /(%2F),(%5C)。

信息: 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 the request target. The valid characters are defined in RFC 7230 and RFC 3986
at org.apache.coyote.http11.InternalAprInputBuffer.parseRequestLine(InternalAprInputBuffer.java:235)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1000)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:637)
at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.doRun(AprEndpoint.java:2517)
at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:2506)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$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)

解决方案：
在tomcat 路径下的conf/catalina.properties文件中最后添加一行：

org.apache.tomcat.util.buf.UDecoder.ALLOW_ENCODED_SLASH=true

或者：

tomcat.util.http.parser.HttpParser.requestTargetAllow=|{}