如何避免请求设置 ASYNC_SUPPORTED=true 以在 Tomcat 7 上启用异步 servlet 3.0 处理? [英] How to avoid request set ASYNC_SUPPORTED=true to enable async servlet 3.0 processing on Tomcat 7?

问题描述

根据此问题报告的问题，解决方案是发现:

Following an issue reported on this question, a solution was found:

req.setAttribute("org.apache.catalina.ASYNC_SUPPORTED", true);

这看起来有点奇怪，并不是真正的可移植"代码(它不会受到伤害，但是......).它似乎特定于 Tomcat 7.我使用的是 NetBeans 7.0.1 提供的 Tomcat 7.0.14.

This seems a bit strange and is not really 'portable' code (it won't hurt, but...). It seems specific to Tomcat 7. I am using Tomcat 7.0.14 as delivered by NetBeans 7.0.1.

我找不到说明有必要在 servlet 3.0 中使用 catalina 属性启用异步请求处理的文档.我找不到说明在 Tomcat 配置级别也需要特殊内容的文档.

I could not find documentation indicating it is necessary to enable async request processing in servlet 3.0 with a catalina attribute. I could not find documentation indicating something special was necessary at the Tomcat configuration level too.

有没有办法避免必须在每个请求中设置 ASYNC_SUPPORTED=true 以在 Tomcat 7 中启用异步 servlet 3.0 处理?

Is there a way to avoid having to set ASYNC_SUPPORTED=true in each request to enable async servlet 3.0 processing in Tomcat 7?

推荐答案

首先要检查的几件事:

确保对请求进行操作的任何过滤器也支持异步(如其中一个答案中所述)你引用了).

Make sure any filters that operate on the request also support async (as addressed in one of the answers to the question you referenced).

确保您使用的是 Servlet 3.0 web.xml - 例如:

Make sure you're using a Servlet 3.0 web.xml - for example:

<web-app xmlns="http://java.sun.com/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
                             http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
         version="3.0"
         metadata-complete="true">

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