TAILIEUCHUNG - UNIT 6. NETWORKING DOCUMENTS AND DATABASES LESSON 2. DYNAMIC WEBSITES: COMMON GATEWAY INTERFACENOTE

Instead of pointing to static HTML pages, the URIs in a web application point to fragments of executable code which dynamically generate the HTML that is sent back to the browser. Very often these fragments of code retrieve data that is stored in databases. | Information Management Resource Kit Module on Management of Electronic Documents UNIT 6. NETWORKING DOCUMENTS AND DATABASES LESSON 2. DYNAMIC WEBSITES COMMON GATEWAY INTERFACE NOTE Please note that this PDF version does not have the interactive features offered through the IMARK courseware such as exercises with feedback pop-ups animations etc. We recommend that you take the lesson using the interactive courseware environment and use the PDF version for printing the lesson and to use as a reference after you have completed the course. FAO 2003 6. Networking documents and databases - 2. Dynamic websites common gateway interface - page 1 Objectives At the end of this lesson you will be able to understand what CGI is and identify capabilities and limitations of CGI. Introduction If we want to allow document searches in our website we have to connect it to a database. In order to overcome some of the limitations of static websites the concept of web applications emerged in the 1980s. This is now the most common way to build a client-server application. Instead of pointing to static HTML pages the URIs in a web application point to fragments of executable code which dynamically generate the HTML that is sent back to the browser. Very often these fragments of code retrieve data that is stored in databases. 6. Networking documents and databases - 2. Dynamic websites common gateway interface - page 2 What is CGI The original and very simple way to implement a web application was to use the CGI standard. CGI Common Gateway Interface is a standard for interfacing external applications with web servers. CGI can be used for a wide range of functions but one of the most common usages is to read or write data in backend databases or other data sources over the World Wide Web. This includes connecting the indexes used by search engines. I What is CgT Web Browser I HTTP Request HTTP Response Web Server CGI Database A CGI application known as CGI or CGI script acts as an interface

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