问题描述
由于仅使用Apache就足以运行许多Web应用程序，所以人们何时以及为什么除了Apache之外还使用Tomcat?
Since simply using Apache can be enough to run many Web applications, when and why do people also use Tomcat in addition to Apache?
推荐答案
Apache Tomcat 是Web服务器和Java Servlet一个容器中，而 Apache HTTPD 只是一个普通的Web服务器(通常仅支持PHP).他们希望能够运行Java/JSP/Servlet时使用Apache Tomcat.可以将其添加到现有的Apache HTTPD/PHP设置中.或者反过来，当将Tomcat关闭以进行某些升级/维护时，他们将Apache HTTPD置于Apache Tomcat的前面，从而能够拥有此站点正在维护"页面.
Apache Tomcat is a webserver and Java servlet container in one, while Apache HTTPD is just a plain webserver (often with only PHP support). They use Apache Tomcat when they want be able to run Java/JSP/Servlet. It can be added to an existing Apache HTTPD / PHP setup. Or the other way round, they bring Apache HTTPD in front of Apache Tomcat to be able to have a "This site is in maintenance" page when Tomcat is been shutdown for some upgrade/maintenance.
对于Apache HTTPD和Apache Tomcat之间的通信，通常使用 Tomcat连接器.也称为 mod_jk .
For communication between Apache HTTPD and Apache Tomcat, the Tomcat Connector is usually been used. It's also known as mod_jk.
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