measure_network_time.py

import json
import time
from selenium import webdriver
from selenium.webdriver.common.desired_capabilities import DesiredCapabilities
from selenium.webdriver.chrome.options import Options


def process_browser_log_entry(entry):
    entry["message"] = json.loads(entry["message"])["message"]
    return entry


def get_network_events():
    browser_log = driver.get_log("performance")
    events = [process_browser_log_entry(entry) for entry in browser_log]
    events = [entry for entry in events if "Network." in entry["message"]["method"]]
    return events


caps = DesiredCapabilities.CHROME
caps["loggingPrefs"] = {"performance": "ALL"}
caps["chromeOptions"] = {"w3c": False, "headless": True}

chrome_options = Options()
chrome_options.add_argument("--disable-extensions")
chrome_options.add_argument("--disable-gpu")
# chrome_options.add_argument("--headless")

driver = webdriver.Chrome(options=chrome_options, desired_capabilities=caps)


driver.get(
    "https://stackoverflow.com/questions/53657215/running-selenium-with-headless-chrome-webdriver"
)

print("wait for everything to load...")
time.sleep(10)

network_events = get_network_events()
json.dump(network_events, open("log.json", "w"))

print(
    "Network time: {}s".format(
        (
            network_events[-1]["message"]["params"]["timestamp"]
            - network_events[0]["message"]["params"]["timestamp"]
        )
    )
)

driver.close()