Get Local IP of a device in chrome extension

Question

I am working on a chrome extension which is supposed to discover and then communicate with other devices in a local network. To discover them it needs to find out its own IP

Answer 1

see http://developer.chrome.com/extensions/webRequest.html for detail, my code example:

// get IP using webRequest
var currentIPList = {};
chrome.webRequest.onCompleted.addListener(
  function(info) {
    currentIPList[info.url] = info.ip;
    currentIPList[info.tabId] = currentIPList[info.tabId] || [];
    currentIPList[info.tabId].push(info);
    return;
  },
  {
    urls: [],
    types: []
  },
  []
);