HTTP Reverse Proxy

When working with HtmlAgilityPack in C# to scrape identical tags, you can use XPath or LINQ queries to select and iterate over the desired elements. Here's an example using HtmlAgilityPack to scrape links (anchor tags) from an HTML document:

using HtmlAgilityPack;

class Program
{
    static void Main()
    {
        // Load the HTML document (replace with your HTML content or file path)
        HtmlDocument htmlDoc = new HtmlDocument();
        htmlDoc.LoadHtml("Link 1Link 2Link 3");

        // Select all anchor elements
        HtmlNodeCollection links = htmlDoc.DocumentNode.SelectNodes("//a");

        // Iterate over each anchor element and print the href attribute
        if (links != null)
        {
            foreach (HtmlNode link in links)
            {
                string href = link.GetAttributeValue("href", "");
                Console.WriteLine("Link: " + href);
            }
        }
        else
        {
            Console.WriteLine("No links found.");
        }
    }
}

In this example:

• The HtmlDocument class is used to load the HTML content.
• The SelectNodes method with the XPath expression "//a" is used to select all anchor elements.
• The GetAttributeValue method is used to retrieve the value of the href attribute for each anchor element.

Make sure to replace the HTML content in htmlDoc.LoadHtml with your actual HTML or load it from a file.

Adjust the XPath expression or use LINQ queries based on your specific HTML structure and the tags you want to scrape. Remember to handle cases where elements might not exist or contain the desired attributes.

Connecting to a Selenium Hub via a corporate proxy can be challenging, as the proxy may require authentication or have specific settings that need to be configured. To connect to the Selenium Hub through a corporate proxy, you'll need to configure the proxy settings in your Selenium client and Hub.

Here's a step-by-step guide on how to set up a Selenium Hub and client with corporate proxy settings:

Configure the Selenium Hub:

First, you need to configure the Selenium Hub to use the corporate proxy. You can do this by modifying the Hub's configuration file (usually hub.yml or hub.json) and adding the proxy settings.

For example, if you're using the hub.yml file, add the following configuration:

proxy:
  type: http
  httpProxy: http://username:[email protected]:port
  nonProxyHosts: localhost, 127.0.0.1, .example.com

Replace username, password, proxy.example.com, and port with the appropriate values for your corporate proxy. The nonProxyHosts setting specifies a list of hosts that should not use the proxy.

Configure the Selenium client:

Next, configure the Selenium client to use the corporate proxy. You can do this by setting the proxy settings in your WebDriver configuration.

For example, in Python with the Chrome WebDriver, you can configure the proxy as follows:

from selenium import webdriver
from selenium.webdriver.chrome.options import Options
from selenium.webdriver.common.proxy import Proxy, ProxyType

proxy = Proxy()
proxy.proxy_type = ProxyType.MANUAL
proxy.http_proxy = "http://username:[email protected]:port"
proxy.ssl_proxy = "http://username:[email protected]:port"

chrome_options = Options()
chrome_options.add_argument("--proxy-server=%s" % proxy.proxy)

driver = webdriver.Chrome(options=chrome_options)
driver.get('your_url')

# Rest of your code

driver.quit()

Replace username, password, proxy.example.com, and port with the appropriate values for your corporate proxy.

Start the Selenium Hub and connect the client:

Start the Selenium Hub and connect the client to the Hub using the appropriate configuration settings.

For example, if you're using the hub.yml file, start the Hub with the following command:

selenium-server-standalone jar hub.yml

Connect the client to the Hub using the appropriate configuration settings. For example, in Python, you can connect the client to the Hub as follows:

from selenium import webdriver
from selenium.webdriver.remote.webdriver import WebDriver
from selenium.webdriver.common.desired_capabilities import DesiredCapabilities

desired_caps = DesiredCapabilities.CHROME
desired_caps['proxy'] = {
    'httpProxy': 'http://username:[email protected]:port',
    'ftpProxy': 'http://username:[email protected]:port',
}

driver = WebDriver(desired_caps=desired_caps)
driver.get('your_url')

# Rest of your code

driver.quit()

Replace username, password, proxy.example.com, and port with the appropriate values for your corporate proxy.

By following these steps, you should be able to connect to a Selenium Hub via a corporate proxy and use the Selenium client to interact with webpages.

To change the language of an internet page using Selenium, you can follow these steps:

1. Locate the language selector element: First, you need to find the element that contains the language selector or the link to the desired language. This can be a dropdown, a list of flags, or a simple link.

2. Locate the desired language option: Once you've found the language selector element, locate the specific language option you want to switch to.

3. Click the desired language option: Use Selenium to click the desired language option, which will change the language of the page.

Here's an example using Python:

Install the required package:

pip install selenium

Create a method to change the language of a web page:

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

def change_language(driver, locator, language_code):
    element = WebDriverWait(driver, 10).until(EC.visibility_of_element_located(locator))
    element.click()

    # Locate the desired language option and click it
    desired_language_locator = (By.CSS_SELECTOR, f"a[href*='{language_code}']")
    desired_language_element = WebDriverWait(driver, 10).until(EC.visibility_of_element_located(desired_language_locator))
    desired_language_element.click()

Use the change_language method in your test code:

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

# Set up the WebDriver
driver = webdriver.Chrome()
driver.maximize_window()

# Navigate to the target web page
driver.get("https://www.example.com")

# Locate the language selector element
language_selector_locator = (By.ID, "language-selector")

# Change the language of the web page
change_language(driver, language_selector_locator, "en")

# Perform any additional actions as needed

# Close the browser
driver.quit()

In this example, we first create a method called change_language that takes a driver instance, a locator tuple containing the locator strategy and locator value, and a language_code string containing the desired language code. Inside the method, we use the WebDriverWait class to wait for the element to become visible and then click the element.

In the test code, we set up the WebDriver, navigate to the target web page, and locate the language selector element using the language_selector_locator variable. We then call the change_language method with the driver, language_selector_locator, and "en" as input. After changing the language, you can perform any additional actions as needed.

Remember to replace "https://www.example.com", "language-selector", and "en" with the actual URL, language selector element ID or locator, and desired language code.

The main scenarios for using a proxy server: bypassing blocking, hiding the real IP, protection of confidential data when connecting to public WiFi access points, interaction with blocked applications, connection to closed portals, forums (which operate only in one country, region).

There are many free VPN services. But it is not safe to use them. After all, they are just engaged in parsing. That is, they collect information about users. Most often - their IP-addresses, as well as text data (these are search queries and their personal information).