Server-sent events
Server-sent events is a technology for where a browser gets automatic updates from a server via HTTP connection. The Server-Sent Events EventSource API is standardized as part of HTML5[1] by the W3C.
History
The WHATWG Web Applications 1.0 proposal[2] included a mechanism to push content to the client. On September 1, 2006, the Opera web browser implemented this new experimental technology in a feature called "Server-Sent Events".
Overview
Server-Sent Events (SSE) is a standard describing how servers can initiate data transmission towards clients once an initial client connection has been established. They are commonly used to send message updates or continuous data streams to a browser client and designed to enhance native, cross-browser streaming through a JavaScript API called EventSource, through which a client requests a particular URL in order to receive an event stream.
Web browsers
| Browser | Supported | Notes |
|---|---|---|
| Internet Explorer | No | [3] |
| Mozilla Firefox | Yes | Starting with Firefox 6.0 [4] |
| Google Chrome | Yes | [3] |
| Opera | Yes | Starting with Opera 11 [3] |
| Safari | Yes | Starting with Safari 5.0 [3] |
Libraries
- TRVSEventSource - Server-sent events EventSource implementation in ObjC for iOS and OS X using NSURLSession.
- Cramp - Ruby/EventMachine based server implementation for WebSocket and Server-Sent Events.
- django-sse - HTML5 Server-Sent Events integration for Python/Django.
- flask-sse - A simple Flask extension for HTML5 server-sent events support, powered by Redis.
- sse - Server Sent Events protocol implementation on python2 and python3 in the same codebase.
- event-source-library - Server Sent Events protocol implementation in python2 with tornado. Client and server implementations.
- SignalR - Transparent implementation for ASP.NET.
- Mojolicious - Perl real-time web framework.
- Hoa\Eventsource - PHP Server-Sent Events implementation.
- sse-stream - Node.js/Browserify Server-Sent Events implementation (client and server).
- partial.js - partial.js is node.js web application framework - supports Server-Sent Events, WebSockets (RFC 6455) and multipart/x-mixed-replace.
See also
References
External links
- HTML5 server-sent events W3C draft specification.
- HTML5 Server-push Technologies, Part 1. Introduction into HTML5 Server-push Technologies. Part 1 covers ServerSent Events.
- Using server-sent events. Concise example how to use server-sent events, on the Mozilla Developer Network.
- Django push: Using Server-Sent Events and WebSocket with Django Django push: Using Server-Sent Events and WebSocket with Django.