title: SpringBoot - Error parsing HTTP request header
body: <p>I am running <code>SpringBoot Application</code> just checked server logs and got several errors like this. I can't understand what can cause it as the error appears everyday after 12/24 hours.</p>
  
  <p>Tomcat Version running on <code>8.5.11</code></p>
  
  <pre><code>2018-03-04 17:03:26 [http-nio-8080-exec-85] INFO  o.a.coyote.http11.Http11Processor - Error parsing HTTP request header
   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:421)
      at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:667)
      at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
      at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:798)
      at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1434)
      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:748)
  </code></pre>