Enabling Data URL in Katalon Studio

I have published a GitHub repository.

Problem to solve

In the Katalon Forum, there are a few posts that ask Katalon Studio to support Data URL.

I want to write a Test Case script like this:

import com.kms.katalon.core.webui.keyword.WebUiBuiltInKeywords as WebUI

WebUI.openBrowser("data:text/html,<h1>Hello, world!</h1>")

Here the code fragment " data:text/html,<h1>Hello, world!</h1> " is called Data URLs as described in RFC2397.

I expect to see a view in browser like this:


But when I executed this script in Katalon Studio v7.9.1, I saw the following result which is disappointing:


Katalon Studio’s keywords WebUI.openBrowser(String url) and WebUI.navigateToUrl(String url) do not support Data URLs.


I studied the source code and found a way to enable Katalon Studio to support Data URL. I have developed a plugin module.


How to install the plugin

  • visit Releases page, download the latest version of katalon-studio-data-url-x.x.x.jar .
  • create your Katalon Studio project, which has a Plugins directory under the project directory.
  • locate the downloaded jar file in the Plugins directory.
  • close/reopen your project to let Katalon Studio acknowledge the jar.

You are done.

How to write your Test Case

In a Test Case script in the Script mode, add one line of import statement and one line of dataurl.enable() before calling WebUI.openBrowser(String) and WebUI.navigateToUrl(String) . That’s all. The WebUI keywords will be enabled for data: URLs.

Let me show you some examples.

WebUI.openBrowser() ito open ‘data:text/html’

Test Cases/research/3_webui_enabledTo_navigateTo_data_html

import com.kms.katalon.core.webui.keyword.WebUiBuiltInKeywords as WebUI

// enable WebUI keywords to accept 'data:' URL
import com.kazurayam.ks.util.DataURLEnabler as dataurl

WebUI.openBrowser("data:text/html,<h1>Hello, world!</h1>")


WebUI.navigateToUrl() to open ‘data:image/png’

Test Cases/research/4_webui_enabledTo_navigateTo_data_png

import com.kazurayam.ks.util.DataURLEnabler as dataurl
import com.kms.katalon.core.webui.keyword.WebUiBuiltInKeywords as WebUI

// create a "data:image/png;base64,xxxxxxxxxxxxxxx" for demo
String pngdataurl = dataurl.demoImage()
//println pngdataurl

// enable WebUI keywords to accept 'data:' URL



When I ran this script, I got the follwing display result:


Research: how Katalon Studio misinterprets a data: URL to be a file: URL

You can read the source of Katalon Studio Keyword:

I found an interesting portion in it:

    public void navigateToUrl(String rawUrl, FailureHandling flowControl) throws StepFailedException {
            URL url = PathUtil.getUrl(rawUrl, "http")
            WebDriver webDriver = DriverFactory.getWebDriver()

My experiment revealed that PathUtil.getUrl("data:text/html,<h1>Hello, world!</h1>", ...) returned an instance of java.net.URL with String value of file:///Users/username/projectdir/data:text/html,%3Ch1%3EHello,%20world!%3C/h1%3E .

I am sure that com.kms.katalon.core.util.internal.PathUtil is misinterpreting it. So how the source of PathUtil.getUrl(String url, ...) looks like?

It is just constructing an instance of java.net.URL class:

    public static URL getUrl(String rawUrl, String defaultProtocol) throws MalformedURLException, URISyntaxException {
        URL url = null;
        try {
            url = new URL(rawUrl);
        } catch (MalformedURLException e) {

I consulted with Guru Google.

Me : Does the default implementation of java.net.URL support Data URL? Can I instanciate it with new URL("data:text/html,Hello world!") ?

Guru : No, it doesn’t. As the javadoc clearly states, the default implementation supports only http, https, ftp, file, and jar.

Me : Is it possible to let java.net.URL instanciated with with data: URL somehow?

Guru : Yes, it is possible. The javadoc of the constructor of java.net.URL clearly describes how to.

How this plugin is implemented

The plugin is implemented with just 2 .groovy files.

Please read the source to find out how it is implemented.