1. Information Retrieval and Web Design
Lecture (3)
Prepared by
Dr. Dunia Hamid Hameed

2. The amazing success of the Web is down to two basic features: HTTP protocol and HTML language. HTTP protocol allows straightforward and easy implementation of a communications system so that any type of file can be easily sent, simplifying the operation of the server, allowing low-power servers to deal with thousands of requests and cutting deployment costs. HTML language feature provides an easy and straightforward mechanism for composing linked pages that is also highly efficient and very user-friendly.
The amazing success of the Web is down to two basic features: HTTP protocol and HTML language. HTTP protocol allows straightforward and easy implementation of a communications system so that any type of file can be easily sent, simplifying the operation of the server, allowing low-power servers to deal with thousands of requests and cutting deployment costs. HTML language feature provides an easy and straightforward mechanism for composing linked pages that is also highly efficient and very user-friendly.
Web basics
The amazing success of the Web is down to two basic features: HTTP protocol and HTML language.

3. The amazing success of the Web is down to two basic features: HTTP protocol and HTML language. HTTP protocol allows straightforward and easy implementation of a communications system so that any type of file can be easily sent, simplifying the operation of the server, allowing low-power servers to deal with thousands of requests and cutting deployment costs. HTML language feature provides an easy and straightforward mechanism for composing linked pages that is also highly efficient and very user-friendly.
The amazing success of the Web is down to two basic features: HTTP protocol and HTML language. HTTP protocol allows straightforward and easy implementation of a communications system so that any type of file can be easily sent, simplifying the operation of the server, allowing low-power servers to deal with thousands of requests and cutting deployment costs. HTML language feature provides an easy and straightforward mechanism for composing linked pages that is also highly efficient and very user-friendly.
Web basics
HTTP protocol allows straightforward and easy implementation of a communications system so that any type of file can be easily sent, simplifying the operation of the server, allowing low-power servers to deal with thousands of requests and cutting deployment costs.

4. The amazing success of the Web is down to two basic features: HTTP protocol and HTML language. HTTP protocol allows straightforward and easy implementation of a communications system so that any type of file can be easily sent, simplifying the operation of the server, allowing low-power servers to deal with thousands of requests and cutting deployment costs. HTML language feature provides an easy and straightforward mechanism for composing linked pages that is also highly efficient and very user-friendly.
The amazing success of the Web is down to two basic features: HTTP protocol and HTML language. HTTP protocol allows straightforward and easy implementation of a communications system so that any type of file can be easily sent, simplifying the operation of the server, allowing low-power servers to deal with thousands of requests and cutting deployment costs. HTML language feature provides an easy and straightforward mechanism for composing linked pages that is also highly efficient and very user-friendly.
Web basics
HTML language feature provides an easy and straightforward mechanism for composing linked pages that is also highly efficient and very user-friendly.

5. HTTP
HTTP (Hypertext Transfer Protocol) is the basic protocol of the WWW. It is a straightforward, connection-oriented protocol without state.

6. HTTPS
There is a HTTP variant called HTTPS (S for secure) that uses the SSL (Secure Socket Layer) security protocol to encrypt and authenticate traffic between the client and the server. This is frequently used by e-commerce Web servers or for personal or confidential information.

7. The Schematic Operation of HTTP
The client sets up a TCP connection to the server, to the HTTP port (or that indicated in the address of the connection), it sends a HTTP resource request command (along with some informative headers) and the server responds through the same connection with the requested data and a series of informative headers.

8. HTTP Protocol

9. HTTP requests: GET and POST
In HTTP, requests can be made using one of two methods. If sending parameters with the request, GET will send them encrypted in the URL. The POST method will send parameters as part of the body of the request if sending them. HTTP responses: Responses in HTTP are very similar to requests.