1. Apache Tomcat Server Typical html Request/Response cycle
1. Requests html page (URL)
server
Apache
Tomcat
Server
client
2. retrieves
page
Files on
server
3. sends page to client
4. browser interprets
html page & displays

2. JavaScript R-R
retrieves
html page
server
Apache
Tomcat
Request HTML page
client
(browser)
contains
JavaScript
returns page to client
executes Javascript
CLIENT-SIDE SCRIPT

3. retrieves page from storage
Java Server Page R-R
Requests
JSP page
retrieves page from storage
server
client
compiles & executes JSP code
replaces code with results
returns
HTML + Results
browser
displays page
SERVER-SIDE SCRIPT
Compiled once
Server treats extensions .jsp & .html differently

4. Three Tier Architecture
File
System on
server
Requests
page
retrieves page from storage
compiles & executes
JSP code
server
Client
(browser)
returns
Results in HTML
Database on
server
SQL interaction with DB
browser
displays page
Three Tier Architecture