Tecnologia push

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Push tecnologia[2] is a communication method used mainly in web-based applications. It involves a server sending information to the client without a specific request from the client, providing real-time updates. This technology is widely used in various applications such as mensagens instantâneas[1], correio eletrónico[3] systems, online auctions, and sports results among others. Examples of push technology include Web push proposal, Web Notifications API[4], Push API, HTTP server push, and Web Socket API, which are all implemented in most browsers for data delivery and communication. Mechanisms used for HTTP server push include chunked transfer encoding, multipart/x-mixed-replace MIME type, Server-Sent Events, and HTTP streaming. The technology also utilizes methods like pushlets and long polling techniques for continuous data updates. In cloud computing, it supports Reliable Group Data Delivery (RGDD) by replicating data across multiple machines for reliability. This summary provides a simplified understanding of push technology and its various applications.

Definições de termos
1. mensagens instantâneas. Instant Messaging (IM) is a digital communication method that enables real-time transmission of text-based messages over internet or computer networks. Unlike email, IM facilitates immediate, interactive conversation, often enhanced with emojis, file transfers, voice-over IP, and video chat. IM systems can function independently or as part of a larger social media platform. They have evolved significantly since early systems like Talkomatic and CompuServe CB Simulator, developing into graphical user interfaces with a wide range of features. Today's popular services, including Signal, Telegram, WhatsApp, and Snapchat, offer private and group messaging, advanced security measures such as end-to-end encryption, and integration with social networks. They play a vital role in both personal communication and business environments, facilitating effective real-time communication with conversation records for future reference.
2. tecnologia. A tecnologia, derivada das palavras gregas que significam ofício e conhecimento, é um termo amplo que se refere às ferramentas, máquinas e sistemas desenvolvidos pelo homem para resolver problemas ou cumprir objectivos. Com origem em ferramentas primitivas como os machados de pedra e a descoberta do fogo, a tecnologia evoluiu significativamente ao longo da história da humanidade. Foi fundamental em diferentes épocas, desde a invenção da roda e dos sistemas avançados de irrigação nas civilizações antigas até ao nascimento das universidades e da imprensa durante os períodos medieval e renascentista. A Revolução Industrial, no século XVIII, marcou uma mudança significativa na produção em massa e na inovação, dando origem a tecnologias modernas como a eletricidade, os automóveis e as plataformas de comunicação digital. Hoje em dia, a tecnologia faz parte integrante de vários aspectos da vida e da sociedade, impulsionando o crescimento económico e a mudança social, ao mesmo tempo que suscita preocupações sobre a segurança, a privacidade e os impactos ambientais. Espera-se que o futuro da tecnologia traga ainda mais avanços, prevendo-se que o aumento da inteligência artificial tenha implicações significativas no mercado de trabalho.
Tecnologia push (Wikipédia)

Push technology, also known as server push, refers to a communication method, where the communication is initiated by a servidor rather than a client. This approach is different from the "pull" method where the communication is initiated by a client.

In push technology, clients can express their preferences for certain types of information or data, typically through a process known as the publish–subscribe model. In this model, a client "subscribes" to specific information channels hosted by a server. When new content becomes available on these channels, the server automatically sends, or "pushes," this information to the subscribed client.

Under certain conditions, such as restrictive security policies that block incoming HTTP requests, push technology is sometimes simulated using a technique called polling. In these cases, the client periodically checks with the server to see if new information is available, rather than receiving automatic updates.

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