Load a page using PhantomJS and log Akamai CDN cache diagnostic information for every requested resource

check-akamai-status.js

#!/usr/bin/env phantomjs --disk-cache=false
/*
    Load one or more URLs requesting Akamai CDN diagnostic information for every resource
    and list resources which are configured not to be cached:

    phantomjs check-akamai-status.js https://www.microsoft.com/ http://www.state.gov https://www.wdl.org/en/

    Additional timing information will be displayed to easily distinguish between requests
    made before DOMContentLoaded or the full load event.
*/

"use strict";
var system = require('system');

function logError() {
    system.stderr.write(Array.prototype.join.call(arguments, ' ') + '\n');
}

function initPage() {
    var page = new WebPage();

    page.onError = function (msg, trace) {
        logError('\t🌋\tERROR:', msg);
        trace.forEach(function(item) {
            logError('  ', item.file, ':', item.line);
        });
    };

    page.onConsoleMessage = function(msg) {
        if (msg == 'GOTO_NEXT_PAGE') {
            page.close();
            loadNextPage();
        } else {
            console.log('\t💻\t' + msg);
        }
    };

    page.onResourceRequested = function(requestData, networkRequest) {
        // Request diagnostic info from Akamai:
        networkRequest.setHeader('Pragma', 'akamai-x-cache-on, akamai-x-cache-remote-on, akamai-x-check-cacheable, akamai-x-get-cache-key, akamai-x-get-true-cache-key, akamai-x-serial-no');
    };


    page.onResourceReceived = function(response) {
        if (response.stage == 'start') {
            var akamaiHeaders = response.headers.filter(function (i) {
                return i.name.match(/X-.*(Akamai|Cache)/i);
            });

            akamaiHeaders.forEach(function (obj) {
                if (obj.name == 'X-Check-Cacheable' && obj.value != 'YES') {
                    console.warning('\t⚠️\tUncacheable response:', response.status, response.url,
                                    JSON.stringify(akamaiHeaders));
                } else if (obj.name == 'X-Cache') {
                    console.info('\t', obj.value.match(/HIT/) ? '🐇' : '🐢' , '\tAkamai:',
                                 response.status, response.url, obj.value);
                }
            });
        }
    };

    return page;
}

function loadNextPage() {
    if (allUrls.length < 1) {
        console.log('All URLs complete');
        phantom.exit();
        return;
    }

    var url = allUrls.shift();
    var page = initPage();
    console.log('🌐\tOpening', url, '(' + allUrls.length + ' remaining)');

    page.onInitialized = function() {
        page.evaluate(function(startTime) {
            /* global window, document */

            document.addEventListener('DOMContentLoaded', function() {
                console.log('DOMContentLoaded', ((Date.now() - startTime) / 1000).toFixed(3) + 's');
            });

            window.addEventListener('load', function() {
                console.log('load event', ((Date.now() - startTime) / 1000).toFixed(3) + 's');

                window.setTimeout(function () {
                    console.log('GOTO_NEXT_PAGE');
                }, 500);
            });

            window.setTimeout(function () {
                console.log('\t👎\tAborting page load after one minute');
                console.log('GOTO_NEXT_PAGE');
            }, 60 * 1000);

        }, Date.now());

        var prerenderUrls = page.evaluate(function() {
            /* global window, document */

            var prerenderLinks = document.querySelectorAll('link[rel*=prerender]'),
                urls = [];

            for (var i = 0; i < prerenderLinks.length; i++) {
                urls.push(prerenderLinks[i].href);
            }
            return urls;
        });

        if (prerenderUrls.length) {
            allUrls.push.apply(allUrls, prerenderUrls);
        }
    };

    var loadStart = Date.now();
    page.open(url, function (status) {
        var loadComplete = Date.now();

        if (status !== 'success') {
            logError('\t⚠️\tUnable to load ', url, ': ', status);
            page.close();
            loadNextPage();
        } else {
            console.log('\t✅\t', url, 'in', ((loadComplete - loadStart) / 1000).toFixed(1), 'seconds');
        }
    });
}

var allUrls = system.args.slice(1);

if (allUrls.length < 1) {
    console.log('Usage:', system.args[0], 'URL [URL …]');
    phantom.exit();
}

loadNextPage();