What are Long-Polling, Websockets, Server-Sent Events (SSE) and Comet?

In the examples below the client is the browser and the server is the webserver hosting the website. Before you can understand these technologies, you have to understand classic HTTP web traffic first. Regular HTTP: A client requests a webpage from a server. The server calculates the response The server sends the response to the client. Ajax Polling: A client requests a webpage from a server using

[mitsugi-bb]

サーバーサイドのプッシュに関してHTTP、AJAXポーリング、AJAXロングポーリング、HTML5のSSE、Websocketの解説が図になっててイメージしやすい。