Tomcat 8 is not able to handle get request with '|' in query parameters?

Question

I am using Tomcat 8. In one case I need to handle external request coming from external source where the request has a parameters where it is separated by |.

Request is looks like this:

http://localhost:8080/app/handleResponse?msg=name|id|

In this case I am getting following error.

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:467)     at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:667)     at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)     at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:789)     at org.apache.tomcat.util.net.NioEndpoint$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) 

EDIT 1

It works with Apache Tomcat 8.0.30 but not with Tomcat 8.5

Answer 1

This behavior is introduced in all major Tomcat releases:

• Tomcat 7.0.73, 8.0.39, 8.5.7

To fix, do one of the following:

• set relaxedQueryChars to allow this character (recommended, see Lincoln's answer)
• set requestTargetAllow option (deprecated in Tomcat 8.5) (see Jérémie's answer).
• you can downgrade to one of older versions (not recommended - security)

---

Based on changelog, those changes could affect this behavior:

Tomcat 8.5.3:

Ensure that requests with HTTP method names that are not tokens (as required by RFC 7231) are rejected with a 400 response

Tomcat 8.5.7:

Add additional checks for valid characters to the HTTP request line parsing so invalid request lines are rejected sooner.

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The best option (following the standard) - you want to encode your URL on client:

encodeURI("http://localhost:8080/app/handleResponse?msg=name|id|") > http://localhost:8080/app/handleResponse?msg=name%7Cid%7C 

or just query string:

encodeURIComponent("msg=name|id|") > msg%3Dname%7Cid%7C 

It will secure you from other problematic characters (list of invalid URI characters).