Access Chrome's network tab (e.g. XHR requests) with Selenium

selenium_xhr_requests_via_performance_logging.py

#
# This small example shows you how to access JS-based requests via Selenium
# Like this, one can access raw data for scraping, 
# for example on many JS-intensive/React-based websites
#

from time import sleep

from selenium import webdriver
from selenium.webdriver import DesiredCapabilities

# make chrome log requests
capabilities = DesiredCapabilities.CHROME
capabilities["loggingPrefs"] = {"performance": "ALL"}  # newer: goog:loggingPrefs
driver = webdriver.Chrome(
    desired_capabilities=capabilities, executable_path="./chromedriver"
)

# fetch a site that does xhr requests
driver.get("https://sitewithajaxorsomething.com")
sleep(5)  # wait for the requests to take place

# extract requests from logs
logs_raw = driver.get_log("performance")
logs = [json.loads(lr["message"])["message"] for lr in logs_raw]

def log_filter(log_):
    return (
        # is an actual response
        log_["method"] == "Network.responseReceived"
        # and json
        and "json" in log_["params"]["response"]["mimeType"]
    )

for log in filter(log_filter, logs):
    request_id = log["params"]["requestId"]
    resp_url = log["params"]["response"]["url"]
    print(f"Caught {resp_url}")
    print(driver.execute_cdp_cmd("Network.getResponseBody", {"requestId": request_id}))

@lorey Thanks for the fast response!

Since I am executing my "python3 script.py" from external script it seams that my system has loaded wrong python version. I have seen that python3.6 is showing error consistently while python3.9 is working as expected. Hopefully this will help someone...

I was stumbling across all solutions available, and I believe that there is no better one, Selenium cant load Chrome extension that uses chrome.debugger API and I have no luck with hotkeys for now in my complex environment.

@lorey, thanks for your fantastic work, just one more thing.
is there a way that i could get only the response data from a specific url?

Hi,

I use performance_logs instead of logs_raw variable name and skipping "chrome://favicon2" and searching for image_name

performance_logs = driver.get_log("performance")
		for performance_log in performance_logs:
			performance_log_json = json.loads(performance_log["message"])
			if performance_log_json["message"]["method"] == 'Network.responseReceived':
				if performance_log_json["message"]["params"]["response"]["url"].find('chrome://favicon2/') != -1:
					continue;
				if performance_log_json["message"]["params"]["response"]["url"].find(image_name) != -1:
					print(performance_log_json["message"]["params"]["response"]["url"])
					print(performance_log_json["message"]["params"]["requestId"])
					print(performance_log_json["message"]["params"]["type"])

Desired Capabilities is deprecated and can't be used anymore, how can I achieve this without it?

@LiamKrenn take a look at this, I haven't tried but hopefully it works https://stackoverflow.com/questions/76622916/converting-desired-capabilities-to-options-in-selenium-python

Hello guys, for Selenium 4.x use it

driver.options.set_capability('goog:loggingPrefs', {'performance': 'ALL'})
driver.get(url)

then just follow the steps from line 24+

Works for selenium 4.13.0

for Selenium 4.15 set the option：

options = webdriver.ChromeOptions()
options.set_capability(
            "goog:loggingPrefs", {"performance": "ALL"}
        )
driver = webdriver.Chrome(options=options)

Something I noticed is that you need to filter out Preflight requests.

if event['params']['type'] != 'Preflight':
    . . .

Otherwise, you might get this error:

{"code":-32000,"message":"No resource with given identifier found"}