Invalid cookie domain

The invalid cookie domain error is a WebDriver error that occurs when an illegal attempt was made to set a cookie under a different domain than that of the current document.

In WebDriver it is not permissable to set cookies for other domains than the domain of the current browsing context's document's domain.

This error will also happen if the document is cookie-averse, that is if the document is not loaded via http://, https://, or ftp://.

Example

Other domains

If the current domain were to be example.com, it would not be possible to add a cookie for the domain example.org:

from selenium import webdriver
from selenium.common import exceptions

session = webdriver.Firefox()
session.get("https://example.com/")
try:
    cookie = {"name": "foo",
              "value": "bar",
              "domain": "example.org"}
    session.add_cookie(cookie)
except exceptions.InvalidCookieDomainException as e:
    print(e.message)

Output:

InvalidCookieDomainException: https://example.org/

This error may also occur when you visit a cookie-averse document, such as a file on your local disk:

from selenium import webdriver
from selenium.common import exceptions

session = webdriver.Firefox()
session.get("file:///home/jdoe/document.html")
try:
    foo_cookie = {"name": "foo", "value": "bar"}
    session.add_cookie(foo_cookie)
except exceptions.InvalidCookieDomainException as e:
    print(e.message)

Output:

InvalidCookieDomainException: Document is cookie-averse

See also