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function setHeaders(xhr, config) {
if (config.cdn == "ak") {
xhr.setRequestHeader("Pragma",
"akamai-x-cache-on, akamai-x-cache-remote-on, akamai-x-check-cacheable,"
" akamai-x-get-cache-key,akamai-x-get-extracted-values, akamai-x-get-nonces,"
" akamai-x-get-ssl-client-session-id, akamai-x-get-true-cache-key,akamai-x-serial-no");
} else {
xhr.setRequestHeader("X-Fb-Debug",'True');
}

if (!config.clear_cache) {
xhr.setRequestHeader('Cache-Control','no-cache')
} else {
xhr.setRequestHeader('If-Modified-Since', new Date(0).toUTCString());
}
}

function getCurrentMilliseconds() {
d = new Date();
return d.getTime();
}

function run_tests(config) {
var xhr = new XMLHttpRequest();
if (config.clear_cache) {
config.url = '?r=' Math.random();
}
// the request is sync to have better measures
xhr.open("GET", config.url, false);
setHeaders(xhr, config);


var start = getCurrentMilliseconds();
xhr.send();
var end = getCurrentMilliseconds();

var result = {};
result['loading_time'] = end - start;
result['platform'] = 'www';
result['cdn'] = config.cdn;
result['url'] = config.url;
result['headers'] = xhr.getAllResponseHeaders();
result['status'] = xhr.status;
return result;
}

// hardcode the return url
var result_endpoint = "https://www.facebook.com/hellocdn/results";

var akamai_pattern = /^(fb|fbcdn-).*-a\.akamaihd.net$/;
var fbcdn_pattern = /.*\.fbcdn\.net$/;

// only authorize loading this script from our cdns
function isValidDomain() {
return akamai_pattern.test(document.domain) ||
fbcdn_pattern.test(document.domain);
}

//sends the result back by loading an image to avoid XSS protections
function postResults(results) {
var result = JSON.stringify({results: results});
var return_image = new Image();
return_image.src = result_endpoint "?data=" encodeURIComponent(result);
}

if (window.addEventListener && isValidDomain()) {
window.addEventListener("message", function(e) {
var msgObj = JSON.parse(e.data);
config = msgObj.config;
results = config.map(run_tests);
postResults(results);
});
};

Chrome

Kokeile Palauttaa Chromen asetukset: chrome://settings/resetProfileSettings