Web Computing

Web Computing

• Web as the ultimate client/server computing platform
• Anytime, Anywhere, Saving

Web Computing Architecture

• Font-end (client-side): browser
• Back-end (server-side): HTTP server (web server)
• Web server extensions:  server-side scripting development environments (ASP.net, PHP, perl, JSP, Java Servlets, etc.)
• Business logic: application servers
• Data stores: database servers
• Transport: TCP/IP, HTTP requests and responses
• Networking: operating systems, Web application firewalls

Client-side

• Browser
• HTML
• Built-in
• Plug-in
• Universal Resource Locator (URL)
• Domain Name
• Sub-domain Name
• Virtual Directory
• Domain Name Server (DNS)

Server-side

• Apache, IIS, etc.
• The only door
• Process requests and responses
• Not an application server or a database server
• Not secure
• Middleware (server-side scripting environment): ASP, php, JSP, CodeFusion, etc.
• 90% of the computing tasks
• Heavy business logic
• Centralized databases