The language I am working in is Javascript on HTML5-compatible browsers.
My understanding is that WebSockets require a socket server to transport push notifications and messages back and forth between clients.
Is there an actual peer-to-peer capability with HTML5 that does not require a socket server? Has anyone seen example client-side code in Javascript that exemplifies this capability?
See the answers for Will HTML5 allow web apps to make peer-to-peer HTTP connections? However, the content in the WebSockets specification seems to have gone, so I suspect the answer now is "no".
WebRTC http://www.webrtc.org/ https://developer.mozilla.org/en-US/docs/Web/Guide/API/WebRTC
But in 2010 it wasn’t a thing :(
Just seen this online, may be worth looking at.
Most of the time browsers are behind firewall and you cannot connect directly to browser. If you don't want to implement server yourself there is a solution:
You can use AJAX calls to communicate between browsers.
来源：https://stackoverflow.com/questions/4181645/does-html5-support-peer-to-peer-and-not-just-websockets