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What is ChromeDriver?
As in previous post, we discussed about Driver Service (like ChromeDriverService, FirefoxDriverService, etc.). It is to start and stop Driver Server before WebDriver initialized and after quit. So that, service needs to be configured driver executable file (via method
useDriverExecutable(File file)). When working with selenium, you should have a driver executor for coresponding browser, like:chromedriver.exe on Windows, or chromedrive on Linux and Mac.geckodriver.exe on Windows, geckodriver on Linux and Mac.edgedriver.exe on Windows, edgedriver on Mac.So, what are they responsible for? Why do we need it in Selenium web automation?
Before we go further, I would remind the log when we start ChromeDriver. It will start a server on free port or on pre-defined port.
Starting ChromeDriver 91.0.4472.101 (...) on port 5353
ChromeDriver was started successfully.Browser drivers are executable, so we can try to run it in command line and check the result.
$ ./chromedriver
Starting ChromeDriver 91.0.4472.101 (...) on port 9515
ChromeDriver was started successfully.Wow, ChromeDriver server was started on port 9515. It was same with using ChromeDriverService in previous post.
From that, we can see that ChromeDriverService get driver executable file and it will start ChromeDriver server internally in selenium code. Then the other services(FirefoxDriverService, EdgeDriverService) do the same way to start browser Server.
From that, we can see that ChromeDriverService get driver executable file and it will start ChromeDriver server internally in selenium code. Then the other services(FirefoxDriverService, EdgeDriverService) do the same way to start browser Server.
Now, we will explore chromedriver by run it with parameter
--help to understand more options.$ ./chromedriver --help
Usage: ./chromedriver [OPTIONS]
Options
--port=PORT port to listen on
--adb-port=PORT adb server port
--log-path=FILE write server log to file instead of stderr, increases log level to INFO
--log-level=LEVEL set log level: ALL, DEBUG, INFO, WARNING, SEVERE, OFF
--verbose log verbosely (equivalent to --log-level=ALL)
--silent log nothing (equivalent to --log-level=OFF)
--append-log append log file instead of rewriting
--replayable (experimental) log verbosely and don't truncate long strings so that the log can be replayed.
--version print the version number and exit
--url-base base URL path prefix for commands, e.g. wd/url
--readable-timestamp add readable timestamps to log
--enable-chrome-logs show logs from the browser (overrides other logging options)
--allowed-ips comma-separated allowlist of remote IP addresses which are allowed to connect to ChromeDriverThere are so many options available that driver server can start with.
For example:
For example:
--version
$ ./chromedriver --version
ChromeDriver 91.0.4472.101 (...)--port
./chromedriver --port=5353
Starting ChromeDriver 91.0.4472.101 (...) on port 5353
ChromeDriver was started successfully.