Web Applications

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INFORMATION TECHNOLOGY 402 NAME :________________________________ CLASS/ SEC :______________ ROLL: _____ SESSION :_____________________________ QUOTE :_______________________________ _______________________________________ WEB APPLICATIONS 1. Browser It is a software which is used to navigate the World Wide Web. 2. Web Client It is a software that communicates with a web server, using Hypertext Transfer Protocol (HTTP). 3. Server It is a software that uses HTTP (Hypertext Transfer Protocol) to serve the files to the web client in response to their requests. It is classified into many categories some of which are Mail Server, Web Server, Application Server etc. 4. Port It is the part of Server which listens to the client’s request. 80 is the accepted standard for the HTTP protocol. 5. Web Applications It is a computer software which a web client runs in a browser using internet. 6. Web resource It is the data or information which is available on the Internet. Some examples are web pages, e-mail, information from database etc. 7. Request It is the query sent by the client to the server to fetch information. Most commonly used request methods are GET and POST. SHEIKH ABDULLAH Page 1 INFORMATION TECHNOLOGY 402 The difference between these request methods are: GET POST remains in the browser history do not remain in the browser history can be bookmarked cannot be bookmarked should never be used for sensitive data may be used for sensitive data transfer GET requests have length restrictions have no restrictions on data length 8. Response It is the relevant information given by Server to the Client in response to a request. It may be either a. Static: It is the web resource which remains unchanged during response. Example: Username. b. Dynamic: It is the Web resource which changes on the fly during response. Example: System time. 9. Protocol It is the agreed upon method of information transfer. Often they are also referred to as schemes, however there is a difference. Few common protocols include: a. Hyper Text Transfer Protocol (HTTP) works as a request-response protocol between a client and server. It is used to view websites. b. Simple Mail Transfer Protocol (SMTP) is a set of rules for sending and receiving emails. c. File Transfer Protocol (FTP) is used to access and transfer files. d. Transmission Control Protocol (TCP) uses a set of rules for communication between computers at Information Packet Level. e. Internet Protocol (IP) uses a set of rules for communication between computers at Internet Address Level. SHEIKH ABDULLAH Page 2 .

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