I'm learning to use Selenium for basic things like taking a screenshot, scraping, and testing and would like to use it with headless Chrome, which is now stable as of Chrome 59.
I have been able to take a screenshot using the 'selenium-webdriver' gem and chromedriver, but not headless.
Here is the ruby script that I am running which hangs after starting to initialize the driver
require 'rubygems'
require 'selenium-webdriver'
Selenium::WebDriver.logger.level = :debug
p 'initializing driver'
driver = Selenium::WebDriver.for :chrome, switches: %w[--headless --disable-gpu --screenshot --hide-scrollbars]
p 'navigating to Google'
driver.navigate.to "http://google.com"
driver.save_screenshot("./screen.png")
driver.quit
and the output from the logs:
:> ruby rubytest.rb
"initializing driver"
2017-06-07 15:55:43 DEBUG Selenium Executing Process
["/Users/name/Documents/scrapings/python/env/bin/chromedriver", "--port=9515"]
2017-06-07 15:55:43 DEBUG Selenium polling for socket on ["127.0.0.1", 9515]
Starting ChromeDriver 2.29.461585 (0be2cd95f834e9ee7c46bcc7cf405b483f5ae83b) on port 9515
Only local connections are allowed.
2017-06-07 15:55:43 INFO Selenium -> POST session
2017-06-07 15:55:43 INFO Selenium >>> http://127.0.0.1:9515/session | {"desiredCapabilities":{"browserName":"chrome","version":"","platform":"ANY","javascriptEnabled":true,"cssSelectorsEnabled":true,"takesScreenshot":false,"nativeEvents":false,"rotatable":false,"chromeOptions":{"args":["--headless","--disable-gpu","--screenshot","--hide-scrollbars"]}}}
2017-06-07 15:55:43 DEBUG Selenium > {"Accept"=>"application/json", "Content-Type"=>"application/json; charset=utf-8", "Content-Length"=>"284"}
[RUBY BACKTRACE TO DRIVER INITIALIZATION]
I have tried using the JavaScript and Python drivers with similar code and nothing works. When I try this with Python, the error message is
WebDriverException: Message: unknown error: Chrome failed to start: exited abnormally
(Driver info: chromedriver=2.29.461585 (0be2cd95f834e9ee7c46bcc7cf405b483f5ae83b),platform=Mac OS X 10.12.5 x86_64)
You can run Google Chrome in headless mode simply by setting the headless property of the chromeOptions object to True. Or, you can use the add_argument() method of the chromeOptions object to add the –headless command-line argument to run Google Chrome in headless mode using the Selenium Chrome web driver.
ChromeOptions options = new ChromeOptions() options. addArgument("headless"); ChromeDriver driver = new ChromeDriver(options); In the above code, the browser is instructed to run in the headless mode using the addArgument() method of the ChromeOptions class provided by the Selenium WebDriver.
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.
I found this blog post useful for setting up headless chrome with selenium in ruby
require "selenium-webdriver"
# configure the driver to run in headless mode
options = Selenium::WebDriver::Chrome::Options.new
options.add_argument('--headless')
driver = Selenium::WebDriver.for :chrome, options: options
driver.navigate.to "https://www.google.com"
# resize the window and take a screenshot
driver.manage.window.resize_to(800, 800)
driver.save_screenshot "screenshot.png"
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