What is HTTP, URL and Search Engine
What is HTTP?
HTTP, Hyper Text Transfer
Protocol is an application level protocol used to transfer data over the web.
There are some rules of HTTP by which web browsers and servers exchange
information over TCP / IP connections. The HTTP server is a program that
listens to the HTTP request on the machine port. The HTTP client or web client
opens a TCP / IP connection to the server via a socket, transmits the request
to the document, and waits for a response from the server. When the request
response sequence is completed, the socket closes. Therefore HTTP is a
transactional protocol (transactional). The duration of the connection
corresponds to a single request-reply sequence, which is called a transaction.
How does HTTP work?
HTTP is a request
response protocol. A request consists of the following
* a request line
* Request headers
* Entity.
A response line sent by
an entity server
* A status line
* Response headers.
* Entity.
Entity in requests and
responses can be thought of as a payload that can be binary data. Others are
readable ASCII charactere | When the response is complete, the browser and
server may end the TCP / IP connection or the browser may send another request.
What is a URL?
The URL is an abbreviation
for Uniform Resource Locator. The URL is the global address of the document and
other resources on the World Wide Web. The first part of the address represents
the protocol and the second is the IP address or domain name where the
resources are located. For example, the URL below points to two different files
on the domain www.nyise.org. The first shows the file located in the
"fanny" sub directory on the NYISE web site. And the other is to
receive the web page through HTTP protocol. http://www.nyise.org/fanny/index.html
http://www.nyise.org/index.html.
Search Engine:
Search engines are used
to find information on the Internet. When we don't know where to start. The search
engine allows the use of keywords to search the Internet site. Search engines
use "robots" and "Crawlers" to find and index words on a
web site. After that, the search engine matches the keyword given in the search
with the words included in the index.
I WWW.Google.com,
WWW.altavista.com, WWW.hotbot.com, WWW.Yahoo.com, www.askjeeves.com are some of
the different search engines.
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