Parameters in HTTP

This chapter lists some of the HTTP protocol parameters and their syntax by which they are used in communication.

Parameters in HTTP

This chapter lists some of the HTTP protocol parameters and their syntax by which they are used in communication. For example, date format, URL format, etc. This will help you in building your requirements and feedback messages while writing Client or Server programs. You will see the complete usefulness of these parameters in the next chapters while learning about the message structure for HTTP requests and responses.

HTTP version

HTTP uses a numbering diagram . to indicate the version of the protocol. The version of an HTTP message is indicated by an HTTP-Version field in the first line. Here is the general syntax of determining the HTTP version number:

 HTTP - Version = "HTTP" "/" 1 * DIGIT "." 1 * DIGIT

For example

 HTTP / 1.0 or HTTP / 1.1

Uniform Resource Identifiers - Identifier for uniform resources

The URI is a form-sensitive, case-insentive string in a simple way containing a name, location, . to identify a source, for example, a website, a web service, . A common syntax of URI is used for HTTP as follows:

 URI = "http:" "//" host [ ":" port ] [ abs_path [ "?" query ]]

Here, if the port is empty or not provided, port 80 is said to be HTTP and an empty abs_path is equivalent to an abs_path as "/". Other characters in the set set and unsafe are equivalent to their "%" HEX HEX "encoding.

For example

Here are 3 examples of URIs that are equivalent:

 http://abc.com:80/~smith/home.html 
 http://ABC.com/%7Esmith/home.html 
 http://ABC.com:/%7esmith/home.html

The Date / Time format

All labels Date / Time HTTP Must be represented in Greenwich Mean Time (GMT), without exception. HTTP applications are allowed to use the following 3 representative labels Date / Time:

 Sun, 06 Nov 1994 08:49:37 GMT; RFC 822, updated by RFC 1123 
 Sunday, 06-Nov-94 08:49:37 GMT; RFC 850, obsoleted by RFC 1036 
 Sun Nov 6 08:49:37 1994; ANSI C's asctime () format

Character sets

We use character sets to determine the character settings that the client likes. Many character sets can be listed separately by commas. If a value is not specified, the default is US-ASII.

For example

Below are valid character sets:

 US-ASCII 

 or 

 ISO-8859-1 

 or 

 ISO-8859-7

Content encoding

A content encryption value indicates that an encryption algorithm has been used to encrypt the content before passing it to the network. Content encryption is first used to allow a document to be compressed or in addition to be transmitted without misidentification.

All content encoding values are case-insensitive. HTTP / 1.1 uses content encoding values in Accept-Encoding and Content-Encoding Header fields that we will look at in the next chapters.

For example

Below are valid encryption schemes:

 Accept-encoding: gzip 

 or 

 Accept-encoding: compress 

 or 

 Accept-encoding: deflate

Multimedia types (media types)

HTTP uses Internet Media Types in Content-Type and Accept fields to provide open and expandable data. All media type values are registered with IANA (Internet Assigned Number Authority). The general syntax for specifying the media type is as follows:

 media-type = type "/" subtype * (";" parameter)

Type, subtype, and parameter attributes are case-insensitive.

For example

 Accept: image / gif

Language tags

HTTP uses language tags in the Accept-Language and Content-Language fields. A language tag consists of one or more sections: A primary language card and a series of sub-tags:

 language-tag = primary-tag * ("-" subtag)

Spaces are not allowed in the card and all tags are case-insentive.

For example

Example tags include:

 en, en-US, en-cockney, i-cherokee, x-pig-latin

The two primary-tag words are an abbreviation for the language in ISO-639 and the first two characters in the subtag are the country code.

According to Tutorialspoint

Previous post: What is HTTP

Next post: Message in HTTP

Security in HTTP
http is used for communication over the internet, so application programmers, information providers, and users should be aware of the protection limitations in http / 1.1.
Caching in HTTP
http is typically used for distributed information systems, where performance can be enhanced by using cached feedback. the http / 1.1 protocol includes several elements that are intended to perform caching tasks.
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 that can be used for other purposes as well as the scaling of request methods, error codes and its header.
Request (HTTP) in HTTP
a client sends an http request to a server in the form a request message that includes the following format.
What is HTTP Flood?
http floods are a type of ddos attack in which an attacker exploits seemingly legitimate http get or post requests to attack a web server or application.
Things you should know about HTTP / 2 protocol
the http version we are using today is http / 1.1, which has been around since 1999, and will soon be replaced by a newer standard, http / 2. this update promises to improve the way browsers and servers communicate with each other, thereby providing faster data transfer speeds while minimizing the power needed to handle access requests.
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.
How HTTP works
hypertext transfer protocol (http) provides a network protocol standard that web browsers and servers use to communicate. you see http every day because when you visit a website, the protocol is written right in the url.
Response (Response) in HTTP
after receiving and interpreting a request message, a server sends a response signal with an http response message.
5 ways to improve website speed with HTTP / 2
hypertext transfer protocol version 2 (hypertext transfer protocol version 2) or http / 2 is the latest http standard. updates to this protocol will improve the speed, performance and security of web traffic.
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.
Full list of HTTP status codes, HTTP Status Code
the http status line is the term given to the http status code (real code) when accompanied by the 'http reason phrase' - the term for the reason (short description).