WebSocket is a protocol providing full-duplex communications channels over a single TCP connection. The WebSocket protocol was standardized by the IETF as RFC 6455 in 2011, and the WebSocket API in Web IDL is being standardized by the W3C. Technical overview Browser implementation WebSocket protocol handshake To establish a WebSocket connection, the client sends a WebSocket handshake request, for which the server returns a WebSocket handshake response, as shown in the following example::section 1.2 Client request: GET /chat HTTP/1.1 Host: server.example.com Upgrade: websocket Connection: Upgrade Sec-WebSocket-Key: x3JJHMbDL1EzLkh9GBhXDw== Sec-WebSocket-Protocol: chat, superchat Sec-WebSocket-Version: 13 Origin: Server response: HTTP/1.1 101 Switching Protocols Upgrade: websocket Connection: Upgrade Sec-WebSocket-Accept: HSmrc0sMlYUkAGmm5OPpG2HaGWk= Sec-WebSocket-Protocol: chat Note that each line ends with an EOL (end of line) sequence, \r\n.
Ratchet - PHP WebSocketsHTML5 Web Sockets: A Quantum Leap in Scalability for the WebLately there has been a lot of buzz around HTML5 Web Sockets, which defines a full-duplex communication channel that operates through a single socket over the Web. HTML5 Web Sockets is not just another incremental enhancement to conventional HTTP communications; it represents a colossal advance, especially for real-time, event-driven web applications. HTML5 Web Sockets provides such a dramatic improvement from the old, convoluted "hacks" that are used to simulate a full-duplex connection in a browser that it prompted Google's Ian Hickson - the HTML5 specification lead - to say: " Reducing kilobytes of data to 2 bytes...and reducing latency from 150ms to 50ms is far more than marginal. In fact, these two factors alone are enough to make Web Sockets seriously interesting to Google." Let's look at how HTML5 Web Sockets can offer such an incredibly dramatic reduction of unnecessary network traffic and latency by comparing it to conventional solutions. HTML5 Web Sockets to the Rescue!
EEMLDinahmoe – Adaptive Music And Interactive Sound DesignHow HTML5 Web Sockets Interact With Proxy ServersWith the recent explosion of WebSocket server implementations, a lot of questions have come up about how HTML5 Web Sockets deal with proxy servers, firewalls, and load-balancing routers. Will proxy servers automatically kill WebSocket connections? Do HTML5 Web Sockets handle firewalls and proxy server issues better than Comet? About HTML5 Web Sockets and Proxy Servers Let's start with some basic concepts: what exactly are HTML5 Web Sockets and proxy servers? HTML5 Web Sockets The HTML5 Web Sockets specification defines the Web Sockets API that enables web pages to use the Web Socket protocol for full-duplex communication with a remote host. To use HTML5 Web Sockets to connect from a Web client to a remote end-point, you create a new WebSocket instance and provide it with the URL that represents the end-point to which you want to connect. Proxy Servers A proxy server is a server that acts as an intermediary between a client and another server (for example, a web server on the Internet).
Web Service ArchitectureA Web service is a method of communications between two electronic devices over a network. It is a software function provided at a network address over the web with the service always on as in the concept of utility computing. The W3C defines a Web service as: a software system designed to support interoperable machine-to-machine interaction over a network. The W3C also states: We can identify two major classes of Web services:REST-compliant Web services, in which the primary purpose of the service is to manipulate XML representations of Web resources using a uniform set of stateless operations; andArbitrary Web services, in which the service may expose an arbitrary set of operations. Explanation Many organizations use multiple software systems for management. Different software might be built using different programming languages, and hence there is a need for a method of data exchange that doesn't depend upon a particular programming language. Web API Criticisms
Apresentando WebSocket: trazendo soquetes para a webO problema: conexões de baixa latência de cliente-servidor e servidor-cliente A web tem sido construída com base no conhecido paradigma de solicitação/resposta de HTTP. Um cliente carrega uma página da web e, em seguida, nada acontece até que o usuário clique na próxima página. Por volta de 2005, o AJAX começou a deixar a web mais dinâmica. Mesmo assim, toda a comunicação HTTP era direcionada pelo cliente, o que exigia interação do usuário ou sondagem periódica para carregar novos dados do servidor. No entanto, todas essas soluções compartilham um problema: elas carregam a sobrecarga de HTTP, que não é adequada para aplicativos de baixa latência. Apresentando WebSocket: trazendo soquetes para a web A especificação WebSocket define uma API que estabelece conexões de "soquete" entre um navegador da web e um servidor. Primeiros passos Para abrir uma conexão WebSocket, basta chamar o construtor WebSocket: var connection = new WebSocket(' ['soap', 'xmpp']);