1 Web Servers (IIS and Apache) Outline 9.1 Introduction 9.2 HTTP Request Types 9.3 System Architecture 9.4 Client-Side Scripting versus Server-Side Scripting.

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Presentation transcript:

1 Web Servers (IIS and Apache) Outline 9.1 Introduction 9.2 HTTP Request Types 9.3 System Architecture 9.4 Client-Side Scripting versus Server-Side Scripting 9.5 Accessing Web Servers 9.6 Web Resources

2 Objectives In this lesson, you will learn: To understand a Web server’s functionality. To introduce Microsoft Internet Information Services (IIS) and Apache Web server. To learn how to request documents from a Web server.

3 9.1 Introduction Web server: Responds to client requests by providing resources URI (Uniform Resource Identifier) Web server and client communicate with platform- independent Hypertext Transfer Protocol (HTTP)

4 Web servers discussed in this chapter.

5 9.2 HTTP Request Types get : Get (retrieves) information from a server i.e: retrieve HTML document or image, fetch search results Sends information as part of URL post: Post (sends) data to a server i.e: authentication information, form data. Sends form data as an HTTP message, not as part of URL

6 Browsers often cache (save on disk) Web pages Quickly reload the page (speed up browsing experience) Browser asks the server if the document has changed or expired If not, the browser loads the document from the cache

7 9.3 System Architecture Multi-tier application (n-tier application): Information tier (data or bottom tier) Maintains data for the application Stores data in a relational database management system (RDBMS) Middle tier Implements business logic and presentation logic Control interactions between application clients and application data Client tier (top tier) Application’s user interface Users interact directly with the application through the client tier

8 Information tier (data or bottom tier) Middle tierClient tier (top tier)

9 9.4 Client-Side Scripting versus Server- Side Scripting Client-side scripts Validate user input Reduce requests needed to be passed to server Access browser JavaScipt, VBScript Server-side scripts Executed on server Generate custom response for clients Wide range of programmatic capabilities Access to server-side software that extends server functionality

Accessing Web Servers Request documents from Web servers know the Host names Local Web servers Access through machine name or localhost Remote Web servers Access through machine name Domain name or Internet Protocol (IP) address Domain name server (DNS): Computer that maintains a database of host names and their corresponding IP address

Web Resources httpd.apache.org httpd.apache.org/docs linuxtoday.com/stories/18780.html