What is HTTP

HTTP is an application-level protocol for distribution, collaboration, multimedia information systems, which is the foundation for data communication for WWW (eg Internet) since 1990. HTTP is a common protocol and stateless, which can be used for other purposes as well as the scaling of request methods, error codes and its Header.

Basically, HTTP is a TCP / IP-based communication protocol, which is used to distribute data (HTML files, image files, etc.) on WWW. The default port is TCP 80, other ports can also be used. It provides a standardized way for computers to communicate with each other. The HTTP specification determines how the client's requested data will be built and sent to the server, and how the server responds to these requests.

Basic features of HTTP

There are three basic features that make HTTP a simple yet powerful protocol:

HTTP is a connectionless protocol : HTTP client, for example: a browser initializes an HTTP request and then a request is created, the Client disconnects from the Server and waits for a response. feedback The server processes the request and resets the connection with the Client to send the response back.

HTTP is an independent medium : It means, any kind of data can be sent by HTTP as long as Server and Client know how to control the data content. It is required for the Client as well as the Server to determine the content type by using the appropriate MIME type.

HTTP is stateless : As mentioned above, HTTP is connectionless and it is a direct result that HTTP becomes a Stateless protocol. Server and Client know about each other in a current request. After that, both of them forgot all about each other. Due to the nature of the protocol, both the Client and the browser can retain information between different requests between sites.

Basic structure

The diagram below shows the very simple structure of a web application and describes the location of HTTP:

What is HTTP Picture 1

The HTTP protocol is a Request / Response protocol based on the Client / Server structure, where web browsers, devices search, etc. act as clients, and web servers act as servers.

Client

The client sends a request to the server in the form of a request method, URI, and protocol version, followed by an MIME message containing the required editors, Client information, and object content. via a TCP / IP connection.

Server

The server responds with a status line, including the protocol version of the message and a successful code or error, followed by an MIME message containing Server information, multimedia entity information and object content. may.

According to Tutorialspoint

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HTTP

Marvin Fry

Update 25 May 2019

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Parameters in HTTP
this chapter lists some of the http protocol parameters and their syntax by which they are used in communication.
Message in HTTP
http is built on the basis of the client-server structure model and stateless request / response protocol, which is governed by the exchange of messages (message) along a tcp / ip connection.
Request (HTTP) in HTTP
a client sends an http request to a server in the form a request message that includes the following format.
Response (Response) in HTTP
after receiving and interpreting a request message, a server sends a response signal with an http response message.
Method in HTTP
the set of common methods for http / 1.1 is defined below and this set of settings can be expanded based on the requirements. these method names are case-sensitive and they must be used in uppercase.
Encrypt status in HTTP
the status-code element is a 3-character integer, in which the first character of the status encoding defines the response type and the last two characters do not have any sorting role. there are 5 values of the first character.