Verify header before request receive in tomcat

问题

I need verify header before receive the request. I found that tomcat valve can help in it. I follow these steps but valve is not called:

1. make a maven project and do this code in it.

   package cz.ValveTest;
   
   import java.io.IOException;
   import java.util.Enumeration;
   import java.util.logging.Level;
   import java.util.logging.Logger;
   
   import javax.servlet.ServletException;
   import javax.servlet.http.HttpServletRequest;
   
   import org.apache.catalina.connector.Request;
   import org.apache.catalina.connector.Response;
   import org.apache.catalina.valves.ValveBase;
   
   public class ProcessingValve  extends ValveBase {
   
   private static final Logger logger = Logger.getLogger(ProcessingValve.class.getName());
   
   @Override
   public void invoke(Request request, Response response) throws IOException,
           ServletException {
   
   HttpServletRequest httpServletRequest = request.getRequest();
   
    Enumeration<String> headerNames = httpServletRequest.getHeaderNames();
    logger.info("++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++");
   
   
    while (headerNames.hasMoreElements()) {
            String header = headerNames.nextElement();
            logger.log(Level.INFO, "Header --> {0} Value --> {1}", new Object[]{header, httpServletRequest.getHeader(header)});
          }
   
     getNext().invoke(request, response);  
   
   
   }
   }
   

2. make jar and put jar inside tomcat/lib folder

3. add this line in server.xml

   <valve className="cz.ValveTest.ProcessingValve"/>
   

4. restart tomcat.

5. Now I hit my web service with header:

   Expect : 100-continue

but using this configuration and code valve is not called on http hit.If any one knew why tomcat valve is not called please help.

回答1:

The tags in server.xml are case sensitive.

So try this :

<Valve className="cz.ValveTest.ProcessingValve"/>

来源：https://stackoverflow.com/questions/34236820/verify-header-before-request-receive-in-tomcat