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I would like to do the following. Log into a website, click a couple of specific links, then click a download link. I'd like to run this as either a scheduled task on windows or cron job on Linux. I'm not picky about the language I use, but I'd like this to run with out putting a browser window up on the screen if possible.
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A headless browser is a web browser without a graphical user interface. Headless browsers provide automated control of a web page in an environment similar to popular web browsers, but they are executed via a command-line interface or using network communication.
Which command starts the google chrome web browser in headless mode? As we have already seen, you just have to add the flag –headless when you launch the browser to be in headless mode. With CLI (Command Line Interface), just write: chrome \<br> – headless \ # Runs Chrome in headless mode.
Headless mode is a functionality that allows the execution of a full version of the latest Chrome browser while controlling it programmatically. It can be used on servers without dedicated graphics or display, meaning that it runs without its “head”, the Graphical User Interface (GUI).
What is Headless testing? Headless testing is simply running your Selenium tests using a headless browser. It operates as your typical browser would, but without a user interface, making it excellent for automated testing.
Here are a list of headless browsers that I know about:
Headless browsers that have JavaScript support via an emulated DOM generally have issues with some sites that use more advanced/obscure browser features, or have functionality that has visual dependencies (e.g. via CSS positions and so forth), so whilst the pure JavaScript support in these browsers is generally complete, the actual supported browser functionality should be considered as partial only.
(Note: Original version of this post only mentioned HtmlUnit, hence the comments. If you know of other headless browser implementations and have edit rights, feel free to edit this post and add them.)
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Check out twill, a very convenient scripting language for precisely what you're looking for. From the examples:
setlocal username <your username> setlocal password <your password> go http://www.slashdot.org/ formvalue 1 unickname $username formvalue 1 upasswd $password submit code 200 # make sure form submission is correct! There's also a Python API if you're looking for more flexibility.
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