Appendix A. The SSE Standard

The official standard for Server-Sent Events is a “W3C Candidate Recommendation” at the time of writing. The latest published version is available from

W3C Candidate Recommendation 11 December 2012

Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C liability, trademark and document use rules apply.

The bulk of the text of this specification is also available in the WHATWG Web Applications 1.0 specification, under a license that permits reuse of the specification text.


This specification defines an API for opening an HTTP connection for receiving push notifications from a server in the form of DOM events. The API is designed such that it can be extended to work with other push notification schemes such as Push SMS.

Status of This Document

This section describes the status ...

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