When I make HTTP Request in JMeter I get Response data like "This page uses JavaScript and requires a JavaScript enabled browser." How is it possible to fix this problem.
JMeter is not a browser, and does not interpret the JavaScript in downloaded pages.
From the JMeter wiki:
JMeter does not process Javascript or applets embedded in HTML pages.
JMeter can download the relevant resources (some embedded resources
are downloaded automatically if the correct options are set), but it
does not process the HTML and execute any Javascript functions.
If the page uses Javascript to build up a URL or submit a form, you
can use the Proxy Recording facility to create the necessary sampler.
If this is not possible, then manual inspection of the code may be
needed to determine what the Javascript is doing.
Depending on what you are doing, you could create an execution test using Selenium IDE for Firefox. The test will run in your browser so the JavaScript will also run. Note though that I never used Selenium as a substitute for JMeter and don't know about common features to both the tools.
I suppose you can use the WebDriver plugin to run real browser tests (IE/Firefox/Chrome/Selenium).
There is good documentation here
You can add WebDriver to JMeter test to fully evaluate the page rendering.
Web Driver Sampler automates the execution and collection of
Performance metrics on the Browser (client-side). A large part of
performance testing, up to this point, has been on the server side of
things. However, with the advancement of technology, HTML5, JS and CSS
improvements, more and more logic and behaviour have been pushed down
to the client. This adds to the overall perceived performance of
website/webapp, but this metric is not available in JMeter. Things
that add to the overall browser execution time may include:
Client-side Javascript execution - eg. AJAX, JS templates
CSS transforms - eg. 3D matrix transforms, animations
3rd party plugins - eg. Facebook like, Double click ads, site analytics, etc
All these things add to the overall browser execution time, and this
project aims to measure the time it takes to complete rendering all
this content.
Official guide: https://jmeter-plugins.org/wiki/WebDriverTutorial/
You need to add HTTP Cookie/Cache Manager to your thread in order to solve this.
Related
I have to do a performance test for application(It has UI) ,It has API requests ,how to find the browser rendering time for APIs , can we do it with retrieve embedded resource. I am quite new to this ,Can someone please guide me.
Not really, as per JMeter project main page:
JMeter is not a browser, it works at protocol level. As far as web-services and remote services are concerned, JMeter looks like a browser (or rather, multiple browsers); however JMeter does not perform all the actions supported by browsers. In particular, JMeter does not execute the Javascript found in HTML pages. Nor does it render the HTML pages as a browser does (it's possible to view the response as HTML etc., but the timings are not included in any samples, and only one sample in one thread is ever displayed at a time).
The only way to measure browser rendering time is using a real browser, if you want to do this along with the existing JMeter performance tests - go for WebDriver Sampler, it provides JMeter integration with Selenium browser automation framework so you will be able to kick off a real browser and measure its rendering time (response time of the WebDriver Sampler will be the time from opening the page till the rendering finishes.
If you need the breakdown - consider using Navigation Timing API
I have a search form which would open a list when 2 characters are typed. I would like to measure that time it takes to open and load the list in jmeter. How can I do it?
If you look into your "Network" tab of your favourite browser developer tools you will see that each time you type a letter or digit in the search field the browser sends a HTTP request to the backend server and it responds with search suggestions:
So all you need to do is to simulate these requests using JMeter and measure the response time.
You can even record these requests using HTTP(S) Test Script Recorder, Badboy, JMeter Chrome Extension, whatever
There are two things, I would like to quote:
JMeter is not a browser
JMeter is not a browser, it works at protocol level. As far as
web-services and remote services are concerned, JMeter looks like a
browser (or rather, multiple browsers); however JMeter does not
perform all the actions supported by browsers. In particular, JMeter
does not execute the Javascript found in HTML pages. Nor does it
render the HTML pages as a browser does (it's possible to view the
response as HTML etc., but the timings are not included in any
samples, and only one sample in one thread is ever displayed at a
time).
From JMeter Wiki
JMeter does not process Javascript or applets embedded in HTML pages.
JMeter can download the relevant resources (some embedded resources
are downloaded automatically if the correct options are set), but it
does not process the HTML and execute any Javascript functions.
If the page uses Javascript to build up a URL or submit a form, you
can use the Proxy Recording facility to create the necessary sampler.
If this is not possible, then manual inspection of the code may be
needed to determine what the Javascript is doing.
Solution #1
Whenever you type each character, check any service call to the server. This can be captured using browser developer tools > Network tab.
E.g.
If you type iPhone, there will be six service calls to the server. By measuring each call individually, you will be able to understand, how your application behaves under the load.
Again this is a service call, not the UI rendering.
https://example.com?q=i
https://example.com?q=iP
https://example.com?q=iPh
https://example.com?q=iPho
https://example.com?q=iPhon
https://example.com?q=iPhone
Solution #2
By leveraging Selenium WebDriver in your JMeter Test plan, you can measure the end-to-end response time.
Please refer this Blazemeter article and this blog for more details.
Visit JMeter Plugins website and search for Selenium to read more details about Selenium WebDriver.
While checking performance of public website why we exclude java scripts, style sheets and include only basic request which returns HTML file(host "www.test.com" and "/" in path.
You need to exclude these scripts, styles and images only during recording of your test scenario with the HTTP(S) Test Script Recorder as if you record these calls they will be captured, but when you replay them it will have nothing in common with that happens in the reality.
Real browsers act as follows:
They download these scripts, images and styles when requesting the main page, but do it in parallel using several concurrent threads to speed up the process. So the main request forks into several sub-requests which are downloading all this stuff. In JMeter you can mimic this behaviour using "Retrieve All Embedded Resources" switch either in HTTP Request or in HTTP Request Defaults
As you already know, browsers download scripts, images and styles and do it using several concurrent threads. The next point is that well-behaved browsers do it only once, on subsequent requests this stuff is being returned from the browser's cache. So you need to add a HTTP Cache Manager to your Test Plan to simulate this functionality representing browser cache and not overload the server
Regarding 3-rd party content. If your web site uses scripts, images, videos, etc. from other domains - it is recommended to exclude these requests from your load testing scope as most likely you don't have any control of these 3-rd party content providers and won't be able to do anything even if the bottleneck is due to external server, your load test should focus solely on your application.
See How To Make JMeter Behave More Like A Real Browser guide for more information on above hints and few more recommendations.
Because JMeter is only retrieving page elements, and does not execute javascript or render these components like real browsers do. Personally i like to retrieve all embedded resources to give myself a better understanding of the total load time, even if javascript is not executed/rendered.
You can also do a selective retrieval, or a full retrieval if you wish.
Use the checkbox named "retrieve embedded resources", or specify which elements should be retrieved. Getting full retrieval is also handy to see whether there are broken links to components in the page.
JMeter User Manual says: JMeter is not a browser. JMeter does not execute the Javascript found in HTML pages.
I wanted to know exact meaning of this statement.
Most perhaps every webpage have javascripts included.
I am taking an example of testing single page (say home page), and as usual this page have number of js, css, images.
During recording, I recorded all embedded resources.
As far my knowledge, before running a test in jmeter, we have following three options
1. Take only top level request (homepage.html) without selecting embedded resources check-box
2. Take top level request (homepage.html) along with selecting embedded resources check-box
3. Keep top level request along with all other components recorded
Which among 3 is the best option to check page load time (I am assuming 1st option, as it tries to replicate close to browser)
and otherwise, if JMeter do not execute javascript, how am I getting response of js file?
JMeter won't execute JavaScript and won't render the page, but it will download the .js file and record and replay any AJAX call which is driven by JavaScript.
So I would suggest going for option 2, but:
tick "Use concurrent pool" and provide number of threads in interval of 3-8
filter "external" resources via "URLs must match" input
add HTTP Cache Manager to ensure that embedded resources are downloaded only once per thread (this is what well-behaved browsers do)
See How to make JMeter behave more like a real browser article for other tips on how to make your load test more realistic
you can get a response of js file with browser automation tools like selenium or testIT Webtester (a fork of selenium)
There seems to be a lot of stress/load testing tool that support AJAX.
I am wondering how well does these tool implemented.
Do they only record http request and replay it?
Is it the right way to test AJAX app?
How does google test their ajax apps?
Most of the load testing tools out there do AJAX load testing the same way: they execute the raw HTTP traffic that is seen during a "recording" phase (which can be page requests, image requests, or even AJAX requests). The main difference among them is how good their recorder/IDE tool is and how easily it helps you parameterize the HTTP requests such that they reflect real world traffic based on dynamic/realtime results.
Warning, blatant plug: The only real exception to this is my company, BrowserMob. Instead of simulating the traffic observed, it actually uses real web browsers to drive back load. As such, the AJAX stuff is handled by the browser.
Useful link: Separate from the blatant plug above (though I do hope you check it out - we're up front with the pricing and provide a free trial), I recently wrote an article for Ajaxian about AJAX load testing. It goes in to more detail about the technical implications of using real browser users (RBUs) vs. virtual users (VUs).
Take a look at LoadBooster(https://www.loadbooster.com). It utilizes headless scriptable browser PhantomJS/CasperJs to test web sites. Phantomjs will parse and render every page, execute the client-side script. The headless browser approach is easier to write test scenarios to support complex AJAX heavy Web 2.0 app，browser navigation, mouse click and keystrokes into the browser or wait until an element exists in DOM. LoadBooster support selenium HTML script too.
Disclaimer: I work for LoadBooster.
If you are worried about functionality only, something like Watin, Watir, Selenium or any functional tool for that matter would work. As long as you put sufficient timing in your functional tests to allow for ajax callbacks then that should do the trick.
To add to my response,
If you are talking about unit testing your javascript you could use something like qunit as described by a fellow LosTechian in this posting. This is a pretty inventive use of an nunit addin and qunit for integrating js unit tests.
By pure coincidence, the same person that posted that qunit testing blog post just posted one yesterday about this very topic
Google apps are written in GWT, which comes with its own extension to JUnit. Article on unit testing ajax applications with GWT.
If you don't want to setup your own load testing server there are a couple of free online load testing services that can run load tests directly over the Internet. For example http://loadimpact.com or http://loadstorm.com
I've used Virtual User Generator, which is a part of the Loadrunner software from HP, to test AJAX applications. The software has several application protocols that can be used to record web applications, e.g. AJAX, and Click and Script.
For the majority of web application load testing it is sufficient to record and replay http requests. This will give the result of how the servers are handling the load. If your web application does a lot of asynchronous loading, and rendering on the client side, e.g. parsing large datasets of xml or json, or many DOM modifications, it can be relevant to include the browser tier to measure the end user experience.
All load testers would support AJAX- they're just additional http connections.
There are a few free ones out there- Jmeter, BadBoy, Grinder that all do it well.
All of them have some sort of support for recording/playback, but that's not always what you're looking for.
Easiest way I've done it is to record a sample session, replace a few params with variables and loop it off of a csv or excel file.
Great starting point: video of a google presentation on open source testing.
Edit: updated video link.
I've used SilkPerformer at a previous job. According to the link, they have some AJAX enhancements. Unfortunately, Silk is far from free.
Check out Jiffy. It's an end-to-end measurement suite, and is subsequently kind of complex. However, the statistics are quite impressive.
Siege? it can do HTTP testing and pass whatever you want.
You can also have a look at fwptt it is open source. If you are a .net developer you can make use of the parameter automatic handling and the possibility to use your own .net object for doing the tests.
I've successfully used JMeter to load test our Ajax (JSF/RichFaces) application. I didn't bother with JMeter's recording tool - rather I used the HttpFox plugin for Firefox to monitor what the browser is POST-ing to the server and I recreated this in JMeter.
It did get a bit complex, but the load test is now fairly robust. JMeter has all kinds of useful 'elements' to extract ID's from a web page, perform conditional logic, increment counters etc.
Better write isolated test method or API for load testing ajax application. There are some reasons:
It's not so easy to write functional tests to Ajax applications, for example for GWT.
You can use Jmeter WebDriver plugin, but for each run it starts browser which will use most of RAM and CPU.
You will load backend not frontend, so you can avoid ajax.
You can devide your testing like that: for Ajax application use Selenium or PhantomJS/CasperJS. For load testing use JMeter, Gatling via API not via Ajax.
My choice is firebug(browser addon). its very lightweight and easy to handle