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WebSockets

I WebSockets sono una tecnologia avanzata che rende possibile aprire una sessione di comunicazione interattiva tra il browser dell'utente e un server. Con questa API si possono mandare messaggi al server e ricevere risposte event-driven senza doverle richiedere al server.

Documentazione

Scrivere applicazioni WebSocket lato client
Un tutorial per scrivere applicazioni WebSocket da eseguire nel browser.
WebSockets reference
Informazioni dettagliate sulla API lato client.
(TBD) Writing WebSocket servers
Una guida per scrivere applicazioni lato server che gestiscano il protocollo WebSocket.

Visualizza tutti

strumenti

Vedi anche

Compatibilità tra browser

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari
Version -76 support 6 4.0 (2.0) No support 11.00 (disabled) 5.0.1
Protocol version 7 support No support 6.0 (6.0)
Moz
No support No support No support
Protocol version 10 support 14 7.0 (7.0)
Moz
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.

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