I am getting below stack trace when I am deploying my application in a multi-server Apache Tomcat 8 environment. I am getting this error frequently, and it seems it is blocking the tomcat thread:
INFO [http-nio-80-exec-4461] org.apache.coyote.http11.AbstractHttp11Processor.process 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.AbstractNioInputBuffer.parseRequestLine(AbstractNioInputBuffer.java:233)
?at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1017)
?at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:684)
?at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1524)
?at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1480)
?at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
?at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
?at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
?at java.lang.Thread.run(Unknown Source)
Can any one direct me how to troubleshoot or narrow down such an exeption? I am not getting any reference to any of my application source files. I tried to google around, and in of the links it said, you are trying to access http url through https, which seems unlikely. I am not getting this error, when the application runs on a single Tomcat 8 instance. I get this only in a multi-server environment.
I am also sharing the meta tags I have embedded on each page, if that helps to identify the cause.
<%
response.setHeader("Cache-Control", "no-cache");
response.setHeader("Cache-Control", "no-store");
response.setDateHeader("Expires", 0);
response.setHeader("Pragma", "no-cache");
%>
<head>
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, minimum-scale=1.0, maximum-scale=1.0">
<meta name="viewport" content="width=device-width, initial-scale=1">
I am also using the following in a few pages, which basically is same as above:
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1">
<meta http-equiv="Expires" content="-1" />
<meta http-equiv="Cache-Control" content="private" />
<meta http-equiv="Cache-Control" content="no-store" />
<meta http-equiv="Pragma" content="no-cache" />
Even if anyone helps in giving a direction to my troubleshooting attempt, that will be useful, as currently I have no idea where to look into.
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