How can I use Selenium to deal with a website's anti-scraping measures?

Web scraping is a method used to extract large amounts of data from websites. However, some websites use certain measures to stop bots from scraping their data. To tackle this, we can use Selenium, a web testing library used to automate browser activities.

Selenium can be used in combination with a headless browser like PhantomJS, Chrome's headless mode, or Firefox in headless mode. This combination can overcome many anti-scraping techniques such as:

1. AJAX Calls: Selenium can handle AJAX calls and wait until the data is loaded.
2. Cookies Based Verification: Selenium can store and transfer cookies between requests.
3. Captcha Handling: Selenium can alert us when there's a Captcha to solve.
4. Infinite Scrolling: Selenium can simulate the scrolling down action to load more data.
5. Website Navigation: Selenium can simulate real user behavior, such as clicking buttons, filling out forms, etc.

There are a few important points to keep in mind while using Selenium to avoid detection:

• Randomize Timing: With Selenium, you can use the time.sleep() function to introduce pauses in your program. This makes your bot appear more like a human because it doesn't send requests at a constant rapid pace. Randomize the delay in your requests rather than putting a constant time.

• Rotate User Agents: Websites can detect the user-agent and block it if it's making many requests. To overcome this, you can rotate the user-agents of your requests.

• Use Proxy Servers: To avoid IP blocking you can use a set of proxy servers.

Here are some Python code snippets that show how you can use Selenium:

from selenium import webdriver
from selenium.webdriver.common.by import By
from selenium.webdriver.support.ui import WebDriverWait
from selenium.webdriver.support import expected_conditions as EC
import time

# Set up the driver for a specific browser (Chrome, in this case)
driver = webdriver.Chrome('/path/to/chromedriver')

# Open the webpage
driver.get('http://www.example.com')

# Wait and check if a specific element is present before proceeding 
try:
    element = WebDriverWait(driver, 10).until(
        EC.presence_of_element_located((By.ID, "myElement"))
    )
finally:
    driver.quit()

# Randomize timing
time.sleep(3)

# Rotate user agents
from selenium.webdriver.chrome.options import Options

opts = Options()
opts.add_argument("user-agent=New User Agent")

driver = webdriver.Chrome(chrome_options=opts)

# Use proxy servers
from selenium.webdriver.chrome.options import Options

opts = Options()
opts.add_argument('--proxy-server=ip:port')

driver = webdriver.Chrome(chrome_options=opts)

Please note that web scraping might be against the terms of service of some websites. Always respect the website's robots.txt file and avoid putting too much load on the server by making too many requests in a short period.