I'm getting this in my logs - is this an attack do you think?  How
might I determine this?

Could this be pushing bytes to the handler and causing a memory issue?

Error parsing HTTP request header
Aug  1 17:37:58 dom1 tomcat9[9793]:  Note: further occurrences of HTTP
request parsing errors will be logged at DEBUG level.
Aug  1 17:37:58 dom1 tomcat9[9793]:
java.lang.IllegalArgumentException: Invalid character found in the
HTTP protocol
Aug  1 17:37:58 dom1 tomcat9[9793]:     at
org.apache.coyote.http11.Http11InputBuffer.parseRequestLine(Http11InputBuffer.java:531)
Aug  1 17:37:58 dom1 tomcat9[9793]:     at
org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:294)
Aug  1 17:37:58 dom1 tomcat9[9793]:     at
org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
Aug  1 17:37:58 dom1 tomcat9[9793]:     at
org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:834)
Aug  1 17:37:58 dom1 tomcat9[9793]:     at
org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1415)
Aug  1 17:37:58 dom1 tomcat9[9793]:     at
org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
Aug  1 17:37:58 dom1 tomcat9[9793]:     at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
Aug  1 17:37:58 dom1 tomcat9[9793]:     at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
Aug  1 17:37:58 dom1 tomcat9[9793]:     at
org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
Aug  1 17:37:58 dom1 tomcat9[9793]:     at java.lang.Thread.run(Thread.java:748)

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