Client (Browser / API)

Servlet Container
(Tomcat)

web.xml Config
(Servlet Mapping URL patterns)

UserServlet.java
doGet(), doPost(),
doPut(), doDelete()

[ Response Generated ]

[ Client Receives Response ]

HTTP Request (e.g., /user)

Reads web.xml

URL → Servlet

(Servlet Mapping)

Finds mapped Servlet class

Processes request

Servlet Container
(Tomcat)

Servlet Container
(Tomcat)

Servlet Container
(Tomcat)