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I have a script that's accessing printers, and my code works totally fine when chrome is run normally, but when it's run headless, selenium can't seem to find elements on the webpage.

Here's the relevant code:

init method:

def __init__(self, ip_address):
    """ Initialize a new Printer_Webpage object."""
    self.ip_address = ip_address
    chrome_options = Options()
    chrome_options.add_argument("--headless")
    chrome_options.add_argument("--disable-gpu")
    chrome_options.add_argument("--window-size=1920x1080")
    self.browser = webdriver.Chrome(chrome_options=chrome_options)
    # Ignore lack of cert for each printer web page.
    # Otherwise, can't open page.
    self.browser.accept_untrusted_certs = True

Login method:

def login(self):
    """Navigates through the login page for the printer."""
    # Open login page
    self.browser.get(f'https://{self.ip_address}/wcd/top.xml')
    # STEPS TO LOGIN:
    # 1) Select 'Administrator' radio button and click.
    self.browser.find_element_by_id('Admin').click()
    # 2) Select Login button and click.
    self.browser.find_element_by_xpath("//input[@type='submit' \
                                        and @value='Login']").click()
    # 3) Select admin (user mode)
    self.browser.find_element_by_id('R_ADM2').click()
    # 4) Select password field and input PASSWORD, then submit.
    password_field = self.browser.find_element_by_id('Admin_Pass')
    password_field.send_keys(PASSWORD)
    password_field.send_keys(Keys.RETURN)

Full error message:

selenium.common.exceptions.NoSuchElementException: Message: no such element: Unable to locate element: {"method":"id","selector":"Admin"}

And here's some other info that might be of use:

(Session info: headless chrome=62.0.3202.94)

(Driver info: chromedriver=2.33.506120 (e3e53437346286c0bc2d2dc9aa4915ba81d9023f),platform=Windows NT 10.0.14393 x86_64)

Answers

If it's an issue with SSL certs, you can start Chrome without certs using a command line flag (assuming that's how you're starting it). I believe the switch is --allow-running-insecure-content, and I located that from this list found here.