On 26/05/2021 09:02, Nada Mahmoud Ahmed Aboueata wrote:
Dear all,
We are using Tomcat 8.5.53, and I have been noticing the attached below
exceptions in my logs. After looking deeply what kind of requests that
caused these exception, I noticed that some request include Null http
protocol and some special characters that cannot be handled by Tomcat.
Also, we have noticed that these kind of requests might crash the web
server from time-time and caused OutOfMemoryError.
That is highly unlikely. When an invalid request is received, Tomcat
responds with a 400 response and closes the connection. The opportunity
for an OOME is slim to nonexistant.
I am not sure if this issue is a bug in Tomcat 8.x that it cannot handle
these requests, so could you please advise what’s recommended to avoid
these exceptions?
There error message is clear:
"Invalid character found in the request target. The valid characters are
defined in RFC 7230 and RFC 3986."
The client is sending an invaild HTTP request and Tomcat is, correctly,
rejecting it.
The recommended way to address isses such as this is to fix the broken
clients that are sending invalid HTTP requests.
Mark
02-Mar-2021 01:33:04.846 INFO
[https-jsse-nio-185.37.108.150-8443-exec-31]
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 HTTP protocol
at
org.apache.coyote.http11.Http11InputBuffer.parseRequestLine(Http11InputBuffer.java:567)
at
org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:502)
at
org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65)
at
org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:818)
at
org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1623)
at
org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at
org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:748)
24-May-2021 23:04:00.693 INFO
[https-jsse-nio-185.37.108.150-8443-exec-309]
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:502)
at
org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:502)
at
org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65)
at
org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:818)
at
org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1623)
at
org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at
org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:748)
Thanks!
Nada Aboueata
Nada Mahmoud Ahmed Aboueata
Application Developer
Information Technology Services Department
Tel.: +974 4403 6369
Fax: +974 4403 3401
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