Unexpected Input

When you surf the Internet, you download one of two types of Web pages to your computer: static or dynamic. A static Web page sits on a Web server until a client computer sends a request for it. Once requested, the Web page is then downloaded to the client computer exactly as it was created, where the Web browser then views the page. A static Web page is really nothing more than a brochure or advertisement, and does not allow the true power of the Internet to be expressed. However, a static page is relatively safe from hackers.

In contrast, dynamic Web pages only exist in a partial state before they are requested. Using scripting languages, a Web server actually fills in all the missing parts and creates the Web page before ...

Get Maximum Wireless Security now with O’Reilly online learning.

O’Reilly members experience live online training, plus books, videos, and digital content from 200+ publishers.