Web Development

Web Applications

A Web Applicaton is an application running on the Internet. Ex: Google, Facebook, Amazon, etc.

A WebApp is typically a 3-tier (or multi-tier) client-server database application run over the Internet .

Using simple HTML and CSS we can create static client Web Sites. Sin embargo, para crear páginas más avanzadas (WebApp) necesitamos otras tecnologías.

A WebApp generally comprises five components:

1. Web Server (HTTP Server):
   • Apache HTTP Server (Compatible con PHP)
   • Apache Tomcat Server (Compatible con JSP (JavaServer Pages))
   • Microsoft Internet Information Server (IIS) (Compatible con ASP.Net)
   • Nginx
   • Google Web Server (GWS)

2. HTTP Client (or Web Browser):
   • Internet Explorer (MSIE), FireFox, Chrome, Safari.

3. Database (Un serveur de base de données):
   • MySQL (mysql-server):

   • Open source, free
   • OS: Windows, Mac OS, Linux OS
   • Web Server: Apache Http, IIS amongst others

   • Oracle:

   • Commercial Licence required
   • OS: Windows, Mac OS, Linux OS
   • Web Server: Apache Http, IIS amongst others

   • MSSQL (Microsoft SQL Server):

   • Commercial Licence required
   • OS: windows, (recently linux version)
   • Web server: IIS

   • Other open-sources: Apache Derby, mSQL, SQLite, PostgreSQL, OpenOffice's Base.
   • Other Commercials: IBM DB2, SAP SyBase, MS Access.

4. Client-Side Programs:
   • HTML
   • CSS
   • JavaScript, VBScript, Flash.

5. Server-Side Programs:
   • PHP: Platform independent (Windows, Linux, Mac OS)
   • Java Servlet/JSP: Platform independent (Windows, Linux, Mac OS)
   • ASP.NET (Windows only (as IIS proprietary to windows))
   • Othre thecnologies: Perl, Python, CGI.