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Established in 1998 as Confinity, [4] PayPal went public through an IPO in 2002. It became a wholly owned subsidiary of eBay later that year, valued at $1.5 billion. [5] In 2015 eBay spun off PayPal to its shareholders, and PayPal became an independent company again.
ISO 3166-1 ( Codes for the representation of names of countries and their subdivisions – Part 1: Country codes) is a standard defining codes for the names of countries, dependent territories, and special areas of geographical interest. It is the first part of the ISO 3166 standard published by the International Organization for Standardization .
- Technical Overview
- History
- Http Data Exchange
- Http Authentication
- Http Application Session
- P/1.1 Response Messages
- P/1.1 Example of Request / Response Transaction
- Encrypted Connections
- Similar Protocols
- See Also
HTTP functions as a request–response protocol in the client–server model. A web browser, for example, may be the client whereas a process, named web server, running on a computer hosting one or more websites may be the server. The client submits an HTTP request message to the server. The server, which provides resources such as HTML files and other...
The term hypertext was coined by Ted Nelson in 1965 in the Xanadu Project, which was in turn inspired by Vannevar Bush's 1930s vision of the microfilm-based information retrieval and management "memex" system described in his 1945 essay "As We May Think". Tim Berners-Lee and his team at CERN are credited with inventing the original HTTP, along with...
HTTP is a stateless application-level protocol and it requires a reliable network transport connection to exchange data between client and server. In HTTP implementations, TCP/IP connections are used using well-known ports (typically port 80 if the connection is unencrypted or port 443 if the connection is encrypted, see also List of TCP and UDP po...
HTTP provides multiple authentication schemes such as basic access authentication and digest access authenticationwhich operate via a challenge–response mechanism whereby the server identifies and issues a challenge before serving the requested content. HTTP provides a general framework for access control and authentication, via an extensible set o...
HTTP is a stateless protocol. A stateless protocol does not require the web server to retain information or status about each user for the duration of multiple requests. Some web applications need to manage user sessions, so they implement states, or server side sessions, using for instance HTTP cookies or hidden variables within web forms. To star...
A response message is sent by a server to a client as a reply to its former request message.[note 4]
Below is a sample HTTP transaction between an HTTP/1.1 client and an HTTP/1.1 server running on www.example.com, port 80.[note 5][note 6]
The most popular way of establishing an encrypted HTTP connection is HTTPS. Two other methods for establishing an encrypted HTTP connection also exist: Secure Hypertext Transfer Protocol, and using the HTTP/1.1 Upgrade headerto specify an upgrade to TLS. Browser support for these two is, however, nearly non-existent.
The Gopher protocolis a content delivery protocol that was displaced by HTTP in the early 1990s.The SPDY protocol is an alternative to HTTP developed at Google, superseded by HTTP/2.The Gemini protocolis a Gopher-inspired protocol which mandates privacy-related features.Constrained Application Protocol – a semantically similar protocol to HTTP but used UDP or UDP-like messages targeted for devices with limited processing capability; re-uses HTTP and other internet...A map of Europe, with ISO 3166-1 alpha-2 codes in place of the full names of countries and other territories. 'Exceptional reservations' codes CQ, EU and UK are not shown. ISO 3166-1 alpha-2 codes are two-letter country codes defined in ISO 3166-1, part of the ISO 3166 standard published by the International Organization for Standardization (ISO), to represent countries, dependent territories ...
Python is a high-level, general-purpose programming language. Its design philosophy emphasizes code readability with the use of significant indentation.[33] Python is dynamically typed and garbage-collected. It supports multiple programming paradigms, including structured (particularly procedural), object-oriented and functional programming ...
Non-binary and genderqueer are umbrella terms for gender identities that are not solely male or female (identities outside the gender binary). Non-binary identities often fall under the transgender umbrella since non-binary people typically identify with a gender that is different from the sex assigned to them at birth, though some non-binary people do not consider themselves transgender.
Fibonacci sequence. A tiling with squares whose side lengths are successive Fibonacci numbers: 1, 1, 2, 3, 5, 8, 13 and 21. In mathematics, the Fibonacci sequence is a sequence in which each number is the sum of the two preceding ones. Numbers that are part of the Fibonacci sequence are known as Fibonacci numbers, commonly denoted Fn .
