Request a server to do an action

• Dynamic pages, content generated by server-side programs.
• CGI, Common Gateway Interface, for sending requests to server-side programs.

Server

static page
Ex:
http://www.google.com/

dynamic page
Ex:
http://www.cna.com.tw/

URL that sends a request by CGI
Ex:
http://maps.google.com/maps?q=24.9586,+121.2411

Browser

HTML Form

Form examples

text field
check box
radio button