How to get innerHTML of whole page in selenium driver?

I'm using selenium to click to the web page I want, and then parse the web page using Beautiful Soup.

Somebody has shown how to get inner HTML of an element in a Selenium WebDriver. Is there a way to get HTML of the whole page? Thanks

The sample code in Python (Based on the post above, the language seems to not matter too much):

from selenium import webdriver
from selenium.webdriver.support.ui import Select
from bs4 import BeautifulSoup


url = 'http://www.google.com'
driver = webdriver.Firefox()
driver.get(url)

the_html = driver---somehow----.get_attribute('innerHTML')
bs = BeautifulSoup(the_html, 'html.parser')