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Tomcat 8.5.37でfurther occurrences of http header parsing errors will be logged at debug level.とエラーが出たときの対処

Tomcat 8.5.37を用いて、サーブレットの開発をしていた時のこと。
突如として

note: further occurrences of http header parsing errors will be logged at debug level.
java.lang.IllegalArgumentException: Invalid character found in method name. HTTP method names must be tokens
at org.apache.coyote.http11.Http11InputBuffer.parseRequestLine(Http11InputBuffer.java:428)
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:684)
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:806)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1498)
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)

というエラーが発生しました。その時は
https://localhost:8080/プロジェクト名
でアクセスしていたのですが、これをhttp://にすることで解決。

参考:
https://stackoverflow.com/questions/42218237/java-lang-illegalargumentexception-invalid-character-found-in-method-name-http

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