Please don't hijack an existing thread. Start a new message for a new
topic. (Replying to an existing message and changing the header is not
sufficient.)

Mark


On 09/04/2020 21:05, Manuel Dominguez Sarmiento wrote:
> Hi, we're reviewing our logs, are we are ocasionally getting the
> following stack traces:
> 
> 09-Apr-2020 11:29:19.489 INFO [tomcat-http-81]
> org.apache.coyote.http11.Http11Processor.service Error parsing HTTP
> request header
>  Note: further occurrences of HTTP request 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:488)
> 
>                 at
> org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:260)
>                 at
> org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65)
> 
>                 at
> org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:868)
> 
>                 at
> org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1594)
> 
>                 at
> org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
> 
>                 at
> java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1130)
> 
>                 at
> java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:630)
> 
>                 at
> org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
> 
> 
> We understand this is a consequence of malformed requests, but we cannot
> seem to pinpoint the cause. It seems these are clients outside of our
> control (our servers are public-facing). The AccessLogValve does not log
> these requests, so we cannot figure out what the request line is. Is
> there any way logging could be improved in order to find out what is
> causing this?
> 
> BTW, we're on Tomcat 9.0.33
> 
> *Manuel Dominguez Sarmiento*
> 
> 


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