怎麽繞過代理IP，追蹤真實的IP

Firefox 跟 Chrome支持WebRTC可以向STUN服務器請求，返回內外網IP，不同於XMLHttpRequest請求，STUN請求開發者工具當中看不到網絡請求的。

//get the IP addresses associated with an account

function getIPs(callback){

var ip_dups = {};

//compatibility for firefox and chrome

var RTCPeerConnection = window.RTCPeerConnection

|| window.mozRTCPeerConnection

|| window.webkitRTCPeerConnection;

var mediaConstraints = {

optional: [{RtpDataChannels: true}]

};

//firefox already has a default stun server in about:config

// media.peerconnection.default_iceservers =

// [{"url": "stun:stun.services.mozilla.com"}]

var servers = undefined;

//add same stun server for chrome

if(window.webkitRTCPeerConnection)

servers = {iceServers: [{urls: "stun:stun.services.mozilla.com"}]};

//construct a new RTCPeerConnection

var pc = new RTCPeerConnection(servers, mediaConstraints);

//listen for candidate events

pc.onicecandidate = function(ice){

//skip non-candidate events

if(ice.candidate){

//match just the IP address

var ip_regex = /([0-9]{1,3}(\.[0-9]{1,3}){3})/

var ip_addr = ip_regex.exec(ice.candidate.candidate)[1];

//remove duplicates

if(ip_dups[ip_addr] === undefined)

callback(ip_addr);

ip_dups[ip_addr] = true;

}

};

//create a bogus data channel

pc.createDataChannel("");

//create an offer sdp

pc.createOffer(function(result){

//trigger the stun server request

pc.setLocalDescription(result, function(){});

}, function(){});

}

//Test: Print the IP addresses into the console

getIPs(function(ip){console.log(ip);});

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