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With help of PhantomJS, we can monitor the network and validate the behavior and performance of a particular webpage. There are callbacks in PhantomJS, i.e., onResourceRequested and onResourceReceived, which help in monitoring the traffic for a given page.
Example
The following example shows how you can use PhantomJS to monitor traffic for a given page.
function createHAR(address, title, startTime, resources) {
// this function formats the data which is coming from
onresourcerequest and onresourcereceived
var entries = [];
resources.forEach(function (resource) {
var request = resource.request, startReply = resource.startReply,
endReply = resource.endReply;
if (!request || !startReply || !endReply) {
return;
}
// Exclude Data URI from HAR file because
// they aren''t included in specification
if (request.url.match(/(^data:image/.*)/i)) {
return;
}
entries.push ({
startedDateTime: request.time.toISOString(),
time: endReply.time - request.time,
request: {
method: request.method,
url: request.url,
httpVersion: "HTTP/1.1",
cookies: [], headers: request.headers,
queryString: [],
headersSize: -1,
bodySize: -1
},
response: {
status: endReply.status,
statusText: endReply.statusText,
httpVersion: "HTTP/1.1",
cookies: [],
headers: endReply.headers,
redirectURL: "",
headersSize: -1,
bodySize: startReply.bodySize,
content: {
size: startReply.bodySize,
mimeType: endReply.contentType
}
},
cache: {},
timings: {
blocked: 0,
dns: -1,
connect: -1,
send: 0,
wait: startReply.time - request.time,
receive: endReply.time - startReply.time,
ssl: -1
},
pageref: address
});
});
return {
log: {
version: ''1.2'', creator: {
name: "PhantomJS",
version: phantom.version.major + ''.'' + phantom.version.minor +
''.'' + phantom.version.patch
},
pages: [{
startedDateTime: startTime.toISOString(),
id: address,
title: title,
pageTimings: {
onLoad: page.endTime - page.startTime
}
}],
entries: entries
}
};
}
var page = require(''webpage'').create(), system = require(''system'');
var fs = require(''fs'');
if (system.args.length === 1) {
console.log(''Usage: netsniff.js <some URL>'');
phantom.exit(1);
} else {
page.address = system.args[1];
page.resources = [];
page.onLoadStarted = function () { // called when page is loaded
page.startTime = new Date();
};
page.onResourceRequested = function (req) {
// called when any files are requested from given page url
page.resources[req.id] = {
request: req,
startReply: null,
endReply: null
};
};
page.onResourceReceived = function (res) {
//called when any files are received.
if (res.stage === ''start'') {
page.resources[res.id].startReply = res;
}
if (res.stage === ''end'') {
page.resources[res.id].endReply = res;
}
};
page.open(page.address, function (status) { // open given page url
var har;
if (status !== ''success'') {
console.log(''FAIL to load the address'');
phantom.exit(1);
} else {
page.endTime = new Date();
page.title = page.evaluate(function () { // gets the page title
return document.title;
});
har = createHAR(page.address, page.title, page.startTime, page.resources);
// calls the function createHAR with page url, starttime, and page resources.
// console.log(JSON.stringify(har, undefined, 4));
fs.write(''log.txt'', JSON.stringify(har, undefined, 4), ''w'');
// logs are collected in log.txt file.
phantom.exit();
}
});
}
Example of log.txt given to HAR preview
{
"log": {
"version": "1.2",
"creator": {
"name": "PhantomJS",
"version": "2.1.1"
},
"pages": [
{
"startedDateTime": "2017-05-21T13:41:21.824Z",
"id": "http://www.sample.com",
"title": "Free Sample Products – Sample.com ≫ Free Samples,
Free Product Samples, Product Test Marketing",
"pageTimings": {
"onLoad": 11081
}
}
],
"entries": [
{
"startedDateTime": "2017-05-21T13:41:21.815Z",
"time": 1999,
"request": {
"method": "GET",
"url": "http://www.sample.com/",
"httpVersion": "HTTP/1.1",
"cookies": [],
"headers": [
{
"name": "Accept",
"value": "text/html,application/xhtml+xml,
application/xml;q = 0.9,*/*;q = 0.8"
},
{
"name": "User-Agent",
"value": "Mozilla/5.0 (Windows NT 6.2; WOW64) AppleWebKit/538.1
(KHTML, like Gecko) PhantomJS/2.1.1 Safari/538.1"
}
],
"queryString": [],
"headersSize": -1,
"bodySize": -1
},
"response": {
"status": 301,
"statusText": "Moved Permanently",
"httpVersion": "HTTP/1.1",
"cookies": [],
"headers": [
{
"name": "Date",
"value": "Sun, 21 May 2017 13:41:25 GMT"
},
{
"name": "Server",
"value": "Apache/2.2.14 (Ubuntu)"
},
{
"name": "Location",
"value": "http://sample.com//"
},
{
"name": "Vary",
"value": "Accept-Encoding"
},
{
"name": "Content-Encoding",
"value": "gzip"
},
{
"name": "Keep-Alive",
"value": "timeout = 15, max = 100"
},
{
"name": "Connection",
"value": "Keep-Alive"
},
{
"name": "Content-Type",
"value": "text/html; charset = iso-8859-1"
}
],
"redirectURL": "",
"headersSize": -1,
"bodySize": 307,
"content": {
"size": 307,
"mimeType": "text/html; charset = iso-8859-1"
}
},
"cache": {},
"timings": {
"blocked": 0,
"dns": -1,
"connect": -1,
"send": 0,
"wait": 1999,
"receive": 0,
"ssl": -1
},
"pageref": "http://www.sample.com"
},
]
{
"startedDateTime": "2017-05-21T13:41:24.898Z",
"time": 885,
"request": {
"method": "GET",
"url": "http://sample.com/",
"httpVersion": "HTTP/1.1",
"cookies": [],
"headers": [
{
"name": "Accept",
"value": "text/html,application/xhtml+xml,
application/xml;q = 0.9,*/*;q = 0.8"
},
{
"name": "User-Agent",
"value": "Mozilla/5.0 (Windows NT 6.2; WOW64) AppleWebKit/538.1
(KHTML, like Gecko) PhantomJS/2.1.1 Safari/538.1"
}
],
"queryString": [],
"headersSize": -1,
"bodySize": -1
},
"response": {
"status": 200,
"statusText": "OK",
"httpVersion": "HTTP/1.1",
"cookies": [],
"headers": [
{
"name": "Date",
"value": "Sun, 21 May 2017 13:41:27 GMT"
},
{
"name": "Server",
"value": "Apache/2.2.14 (Ubuntu)"
},
{
"name": "X-Powered-By",
"value": "PHP/5.3.2-1ubuntu4.29"
},
{
"name": "X-Pingback",
"value": "http://sample.com/xmlrpc.php"
},
{
"name": "Link",
"value": "<http://sample.com/wp-json/>;
rel = "https://api.w.org/", <http://wp.me/P6Jj5H-4>;
rel = shortlink"
},
{
"name": "Vary",
"value": "Accept-Encoding"
},
{
"name": "Content-Encoding",
"value": "gzip"
},
{
"name": "Keep-Alive",
"value": "timeout = 15, max = 99"
},
{
"name": "Connection",
"value": "Keep-Alive"
},
{
"name": "Content-Type",
"value": "text/html; charset = UTF-8"
}
],
"redirectURL": "",
"headersSize": -1,
"bodySize": 1969,
"content": {
"size": 1969,
"mimeType": "text/html; charset = UTF-8"
}
},
"cache": {},
"timings": {
"blocked": 0,
"dns": -1,
"connect": -1,
"send": 0,
"wait": 869,
"receive": 16,
"ssl": -1
},
"pageref": http://www.sample.com
},
{
"startedDateTime": "2017-05-21T13:41:25.767Z",
"time": 388,
"request": {
"method": "GET",
"url": "http://sample.com/wpcontent/themes/samplecom/style.css",
"httpVersion": "HTTP/1.1",
"cookies": [],
"headers": [
{
"name": "Accept",
"value": "text/css,*/*;q = 0.1"
},
{
"name": "Referer",
"value": "http://sample.com/"
},
{
"name": "User-Agent",
"value": "Mozilla/5.0 (Windows NT 6.2; WOW64) AppleWebKit/538.1
(KHTML, like Gecko) PhantomJS/2.1.1 Safari/538.1"
}
],
"queryString": [],
"headersSize": -1,
"bodySize": -1
},
"response": {
"status": 200,
"statusText": "OK",
"httpVersion": "HTTP/1.1",
"cookies": [],
"headers": [
{
"name": "Date",
"value": "Sun, 21 May 2017 13:41:27 GMT"
},
{
"name": "Server",
"value": "Apache/2.2.14 (Ubuntu)"
},
{
"name": "Last-Modified",
"value": "Fri, 22 Apr 2011 00:32:22 GMT"
},
{
"name": "ETag",
"value": ""e1d7-1836-4a176fdbbd180""
},
{
"name": "Accept-Ranges",
"value": "bytes"
},
{
"name": "Vary",
"value": "Accept-Encoding"
},
{
"name": "Content-Encoding",
"value": "gzip"
},
{
"name": "Keep-Alive",
"value": "timeout = 15, max = 98"
},
{
"name": "Connection",
"value": "Keep-Alive"
},
{
"name": "Content-Type",
"value": "text/css"
}
],
"redirectURL": "",
"headersSize": -1,
"bodySize": 3174,
"content": {
"size": 3174,
"mimeType": "text/css"
}
},
"cache": {},
"timings": {
"blocked": 0,
"dns": -1,
"connect": -1,
"send": 0,
"wait": 388,
"receive": 0,
"ssl": -1
},
"pageref": "http://www.sample.com"
}
}
}
Output
The above program generates the following output.
All the logs are collected in a .txt file and later, the same is converted as above using the HAR preview, for example, (http://www.softwareishard.com/har/viewer/)
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