最近部署專案的時候，由於MIS配置的是Tomcat 8.5的服務端，導致Web應用不正常，報HTTP 400錯誤（Chrome無異常、IE報錯）。問題原因初步判斷為8.5版本的服務端接收請求不會對符號進行轉義，Chrome不異常的原因或許是瀏覽器自身轉義了。具體錯誤資訊如下：

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.Http11InputBuffer.parseRequestLine(Http11InputBuffer.java:472)
        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)

在conf/catalina.properties中最後新增一行：

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

重啟伺服器後，解決問題。