Вебсокеты это продвинутая технология, позволяющая открыть постоянное двунаправленное сетевое соединение между браузером пользователя и сервером. С помощью его API вы можете отправить сообщение на сервер и получить ответ без выполнения http запроса, причем этот процесс будет событийно-управляемым.


Writing WebSocket client applications
Учебник описывающий как написать WebSocket клиента работающего в браузере.
Справочник по WebSocket
A reference to the client-side WebSocket API.
(TBD) Writing WebSocket servers
A guide to writing server-side code to handle the WebSocket protocol.

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See also

Browser compatibility

We're converting our compatibility data into a machine-readable JSON format. This compatibility table still uses the old format, because we haven't yet converted the data it contains. Find out how you can help!

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari
Version -76 support 6 4.0 (2.0) Нет 11.00 (disabled) 5.0.1
Protocol version 7 support Нет 6.0 (6.0)
Нет Нет Нет
Protocol version 10 support 14 7.0 (7.0)
HTML5 Labs ? ?
Standard - RFC 6455 Support 16 11.0 (11.0) 10 12.10 6.0
Feature Android Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile
Version -76 support ? ? ? ? ?
Protocol version 7 support ? ? ? ? ?
Protocol version 8 support (IETF draft 10) ? 7.0 (7.0) ? ? ?
Standard - RFC 6455 Support 16 (Chrome) 11.0 (11.0) ? 12.10 6.0

Gecko notes

WebSockets support in Firefox is continuing to track the evolving WebSocket specification. Firefox 6 implements version 7 of the underlying protocol, while Firefox 7 implements version 8 (as specified by IETF draft 10). Firefox mobile received WebSocket support in Firefox mobile 7.0.

Gecko 6.0

Prior to Gecko 6.0 (Firefox 6.0 / Thunderbird 6.0 / SeaMonkey 2.3), there was, incorrectly, a WebSocket object that some sites were thinking implied that WebSocket services were not prefixed; this object has been renamed to MozWebSocket.

Gecko 7.0

Starting in Gecko 7.0 (Firefox 7.0 / Thunderbird 7.0 / SeaMonkey 2.4), the network.websocket.max-connections preference is used to determine the maximum number of WebSocket connections that can be open at a time. The default value is 200.

Gecko 8.0

Starting in Gecko 8.0 (Firefox 8.0 / Thunderbird 8.0 / SeaMonkey 2.5), the deflate-stream extension to the WebSocket protocol has been disabled, since it's been deprecated from the specification drafts. This resolves incompatibilities with some sites.

Gecko 11.0

Prior to Gecko 11.0, both incoming and outgoing messages were limited to 16 MB in size. They may now be up to 2 GB in size. Note, however, that memory limitations (especially on mobile devices) make that a theoretical maximum, not a practical one. In reality, transfers of that size will fail on devices that don't have enough memory.

Additionally, ArrayBuffer send and receive support for binary data has been implemented.

Starting in Gecko 11.0, the WebSocket API is no longer prefixed.

Warning: Among other things, a key reason WebSockets was disabled by default in Firefox 4 and 5 is the discovery of a security issue in the protocol's design. This was fixed in Firefox 6 by implementing a newer version of the protocol that corrects the problem.