[Tomcat] 1. Why do we use a tomcat?

 Why do we use a tomcat?

1. Web application server

- tomcat, JBoss, TomEE, jetty....

2.  pros and cons

  1) pros

- Free

- Cross-platform

  2) cons

   - Tomcat only has a Java SE spec

   - Tomcat is not a completely WAS

3. How to consist of tomcat

1) Catalina : servlet container

  - It's Environment that host java's servlet

2) Coyote : HTTP component

  - To provide protocol through TCP

3) Jasper : Engine of JSP

  - Dealing with a request of JSP

4. Process

  1) Coyote get a http request

  2) Catalina search for a Doc Base and refer to web.xml 

  3) If this request is a JSP, Jasper will compile it