Experimental flags with Chrome webdriver

[Pascal H]

Hi, I'm trying to enable experimental flags when launching Chrome with web driver :

I did the following :

from selenium.webdriver.chrome.options import Options

myOptions = Options()

myOptions.add_argument("--enable-quic")

myOptions.add_argument("--enable-tcp-fast-open")

driver = webdriver.Chrome(chrome_options=myOptions)

Now, in chrome://version, I have :

Command Line

/usr/bin/google-chrome --disable-background-networking --disable-client-side-phishing-detection --disable-default-apps --disable-hang-monitor --disable-popup-blocking --disable-prompt-on-repost --disable-sync --disable-web-resources --enable-automation --enable-logging --enable-quic --enable-tcp-fast-open --force-fieldtrials=SiteIsolationExtensions/Control --ignore-certificate-errors --load-extension=/tmp/.org.chromium.Chromium.8w4LVP/internal --log-level=0 --metrics-recording-only --no-first-run --password-store=basic --remote-debugging-port=0 --test-type=webdriver --use-mock-keychain --user-data-dir=/home/woo/myTEmp --flag-switches-begin --flag-switches-end

And in chrome://flags, neither QUIC nor Fast Open is enabled.

If I change manually the QUIC and Fast Open option in chrome://flags and click on relaunch, I will now have :

Command Line

/usr/bin/google-chrome --disable-background-networking --disable-client-side-phishing-detection --disable-default-apps --disable-hang-monitor --disable-popup-blocking --disable-prompt-on-repost --disable-sync --disable-web-resources --disk-cache-size=1 --enable-automation --enable-logging --enable-quic --enable-tcp-fast-open --force-fieldtrials=SiteIsolationExtensions/Control --ignore-certificate-errors --load-extension=/tmp/.org.chromium.Chromium.8w4LVP/internal --log-level=0 --media-cache-size=1 --metrics-recording-only --no-first-run --password-store=basic --remote-debugging-port=0 --test-type=webdriver --use-mock-keychain --user-data-dir=/home/woo/myTEmp --flag-switches-begin --enable-quic --enable-tcp-fastopen --flag-switches-end

(And in chrome://flags I do have the QUIC and Fast Open Options)

So it appears to me that to enable experimental flags, they need to be located between the 

"--flag-switches-begin" and "--flag-switches-end".

So, is there any way to tell Selenium to set the options within those 2 flags ?

Regards,

Pascal

[Pascal H]

For anyone interested, I found this workaround (pretty complex :p), but didn't find a way to enable this through Selenium functions.

Regards, Pascal

from selenium import webdriver

from selenium.webdriver.chrome.options import Options

import time

## Browser config javascript commands (need to be launched from chrome://flags)

enable_quic_command = "chrome.send('enableExperimentalFeature',['enable-quic' + '@' + 1, 'true'])"

enable_fastopen_command = "chrome.send('enableExperimentalFeature', ['enable-tcp-fast-open', 'true'])"

def chrome_configure_experimental_flags(myDriver):

myDriver.get('chrome://flags') #Load page where configuration javascript commands are allowed

myDriver.execute_script(enable_quic_command) #Enable QUIC

myDriver.execute_script(enable_fastopen_command) #Enable TCP

myDriver.get('chrome://flags') #Re-load so that we can check

time.sleep(2) #Give some time to check the flag

myOptions = Options()

#Set disk and media cache size to disable caching

myOptions.add_argument("--disk-cache-size=1")

myOptions.add_argument("--media-cache-size=1")

#Set our own, to be re-used, profile

profile_folder = '/tmp/' + 'profile_chrome_' + time_string

myOptions.add_argument("user-data-dir=" + profile_folder)

#Create driver

driver = webdriver.Chrome(chrome_options=myOptions)

#Set experimental features

chrome_configure_experimental_flags(driver)

#Close and re-build driver with same options (and so same profile, so experimental flags will be kept)

driver.close()

driver = webdriver.Chrome(chrome_options=myOptions)

[Shawn McCarthy]

what kind of different do you see with these two flags ?

[Pascal H]

Hi Shawn, 

 

I'm studying transport-layer protocols and their performance when accessing Internet through a satellite.

Thanks to those two flags, Chrome will here use the QUIC protocol and the TFO option of TCP whenever possible.

And then I use Selenium to register some performance metrics with Chrome when accessing different type of services on different servers, with different transport layer protocols.

Regards, 

Pascal

 

[René Ernst]

Pascal,

Thanks for this great code. I was struggling with exactly the same, and I would never have been able to work this out myself. I only had to convert your code to Java but that was a piece of cake.

Being unable to set Chrome flags would have been a showstopper for my project, and now everything is working as intended.

Thanks again, great job!

René

[Александр Юрков]

Good afternoon, could you please write the code converted to Java code.

воскресенье, 25 августа 2019 г. в 06:40:54 UTC+3, René Ernst:

[Александр Юрков]

René Ernst, 

Good afternoon, could you please write the code converted to Java code.

воскресенье, 25 августа 2019 г. в 06:40:54 UTC+3, René Ernst:

Pascal,

[ddlionx]

Try this https://www.jython.org/. ;) 

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[anfas...@gmail.com]

This can be handled using below scripts.

Java:

                       ChromeOptions options = new ChromeOptions();

                        HashMap<String, Object> chromeLocalStatePrefs = new HashMap<String, Object>();

                        List<String> experimentalFlags = new ArrayList<String>();

                        experimentalFlags.add("same-site-by-default-cookies@2");

                        experimentalFlags.add("cookies-without-same-site-must-be-secure@2");

                        chromeLocalStatePrefs.put("browser.enabled_labs_experiments", experimentalFlags);

                        options.setExperimentalOption("localState", chromeLocalStatePrefs);

C#:

                        var chromeOptions = new ChromeOptions();

                        var experimentalFlags = new List<string>();

                        experimentalFlags.Add("same-site-by-default-cookies@2");

                        experimentalFlags.Add("cookies-without-same-site-must-be-secure@2");

                        chromeOptions.AddLocalStatePreference("browser.enabled_labs_experiments", experimentalFlags);

Hope this will help you.

Regards

Anfas