Websockets 是否允许 p2p (浏览器到浏览器)通信？

为了澄清当我询问浏览器与浏览器之间的通信时，我的意思是在转发消息之间没有服务器。我想在游戏中实现类似的东西。如果网络套接字中的 p2p 不可能实现，是否有类似的替代方案？感谢你的帮助。

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最佳答案

No. Browsers can only initiate WebSockets connections, not receive them. The W3C browser API spec only defines how to start an outbound connection.

You can make an application that would both initiate and accept WebSockets connections, but browsers do not do this.

You might look at Pusher App which you could use to build a WebSockets application with multiple clients. The service provides up to 20 simultaneous WebSockets clients for free (you can pay for higher scaling).

Update:

The WebRTC protocol and API is making rapid progress and allows a Data Channel to be established between two peers (you still may need a STUN/TURN server for the initial NAT traversal and setup).

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In theory it is possible with WebRTC DataChannel:

RTCDataChannel is a WebRTC API for high performance, low latency, peer-to-peer communication of arbritary data. The API is simple—similar to WebSocket—but communication occurs directly between browsers, so RTCDataChannel can be much faster than WebSocket even if a relay (TURN) server is required (when 'hole punching' to cope with firewalls and NATs fails).

"In theory" because it isn't supported by a stable browser yet and you still need a relay server (TURN) if one of the browsers is behind a symmetric NAT. Nevertheless, it is a really promising feature.

Update: Chrome 26 and Firefox 22 support RTCDataChannel by default and Firefox 19-21 if you enable WebRTC by setting media.peerconnection.enabled to true (about:config).

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I was reading about websocket and peer 2 peer and found PeerJS.

I still haven't made anything though, but by the examples it looks promising.

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Now days it's possible, currently only Chrome,FF and Opera support it (desktop).

There's some libraries starting to pop up around the web right now, such as PeerJS and js-platform-p2p which pretty much simplifies things.

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Simple and reliable cross browser supported way is to use http://httprelay.io with AJAX calls. It is also implements one to many communication what could be useful for game development.


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