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.
strumenti
- Socket.IO: Una potente API cross-platform per WebSocket e Node.js.
- WebSocket-Node: Un'implementazione lato server dell'API di Websocket per Node.js.
- Una lista più completa di frameork e librerie
Argomenti correlati
Vedi anche
- RFC 6455 - The WebSocket Protocol
- WebSocket API Specification
- Server-Sent Events
- WebSocket.us - a community-run, not-for-profit site about WebSocket
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.