请求后，后台输出，有点不太一样，想了解更多点，哪里配置的问题吗

1、发送请求index.jsp

requestInitialized name:null

ServletRequest_attributeReplaced:org.apache.catalina.ASYNC_SUPPORTED

sessionCreated

requestDestroyed

2。在index.jsp中点击init发送请求

requestInitialized name:null

ServletRequest_attributeReplaced:org.apache.catalina.ASYNC_SUPPORTED

ServletRequest_attributeAdded:requestName

HttpSession_attributeAdded:sessionName

ServletContext_attributeAdded:contextName

requestDestroyed

3.在init.jsp中再次点击init发送请求

requestInitialized name:null

ServletRequest_attributeReplaced:org.apache.catalina.ASYNC_SUPPORTED

ServletRequest_attributeAdded:requestName

HttpSession_attributeReplaced:sessionName

ServletContext_attributeReplaced:contextName

requestDestroyed

1、求问，我的每次都要加载一次这个常量，是什么ServletRequest_attributeReplaced:org.apache.catalina.ASYNC_SUPPORTED