Expo Proxy

Audience parsing is the collection of information about users. Most often it is used to get statistical data, to check the server capacity. Sometimes it is also used to compile a database of potential customers.

In CentOS, if there is no graphical interface (from the terminal), proxy configuration is done through the export http_proxy=http://User:Pass@Proxy:Port/ command. Accordingly, User is the user, Pass is the password to identify you, Proxy is the IP address of the proxy, and Port is the port number. If you have DE, the configuration can be done via Network Manager (as in any other Linux distribution).

It seems there might be a confusion in your request. Polly is a resilience and transient-fault-handling library in C# for dealing with issues like network failures, timeouts, and other transient errors. It is not directly related to parsing courses or web scraping.

If you are looking to parse a course from a website using C#, you might want to use a combination of HTTP requests and HTML parsing libraries. Here's a basic example using the HtmlAgilityPack library for HTML parsing and HttpClient for making HTTP requests

Install HtmlAgilityPack:

You can install the HtmlAgilityPack library using NuGet Package Manager Console:

Install-Package HtmlAgilityPack

Example Code

Here's a simple example of how you might use HttpClient and HtmlAgilityPack to parse course information from a website:

using System;
using System.Net.Http;
using HtmlAgilityPack;

class Program
{
    static async System.Threading.Tasks.Task Main(string[] args)
    {
        // URL of the course page
        string courseUrl = "https://example.com/courses";

        // Make an HTTP request to get the HTML content
        using (HttpClient client = new HttpClient())
        {
            string htmlContent = await client.GetStringAsync(courseUrl);

            // Use HtmlAgilityPack to parse the HTML
            HtmlDocument doc = new HtmlDocument();
            doc.LoadHtml(htmlContent);

            // Extract course information (modify as per the HTML structure)
            HtmlNodeCollection courseNodes = doc.DocumentNode.SelectNodes("//div[@class='course']");
            if (courseNodes != null)
            {
                foreach (HtmlNode courseNode in courseNodes)
                {
                    string courseTitle = courseNode.SelectSingleNode(".//h2")?.InnerText.Trim();
                    string courseDescription = courseNode.SelectSingleNode(".//p")?.InnerText.Trim();

                    Console.WriteLine($"Title: {courseTitle}");
                    Console.WriteLine($"Description: {courseDescription}");
                    Console.WriteLine();
                }
            }
            else
            {
                Console.WriteLine("No course information found on the page.");
            }
        }
    }
}

This is a basic example, and you'll need to adapt it based on the actual HTML structure of the course page you are working with.

While using Selenium for web automation, it's important to note that websites can detect the presence of automation tools, including Selenium. To reduce the chances of detection, you can take certain measures to make your Selenium-driven browser instance appear more like a regular user. Here are some techniques to hide Selenium from the browser

1. User Agent Spoofing

Change the user agent of the browser to mimic that of a real user. This can be done by setting the user agent string before launching the browser:

from selenium import webdriver

options = webdriver.ChromeOptions()
options.add_argument("--user-agent=Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/91.0.4472.124 Safari/537.36")

driver = webdriver.Chrome(options=options)

2. Window Size and Position

Set the window size and position to common values used by human users. This can be done using the set_window_size and set_window_position methods:

driver.set_window_size(1366, 768)
driver.set_window_position(0, 0)

3. Disable Browser Extensions

Disable browser extensions to make the browser instance more similar to a clean user profile:

options.add_argument("--disable-extensions")

4. Headless Mode

Run the browser in headless mode, which means it runs without a graphical user interface. Headless mode can be less likely to be detected:

options.add_argument("--headless")

5. Disable Images and CSS

Some automation detection mechanisms analyze whether images and CSS are loaded. You can disable them:

prefs = {"profile.managed_default_content_settings.images": 2, "profile.managed_default_content_settings.stylesheet": 2}
options.add_experimental_option("prefs", prefs)

6. Change Automation Flags

Some websites use JavaScript to detect automation. You can experiment with changing the values of WebDriver-related flags:

options.add_argument("--disable-blink-features=AutomationControlled")

7. Use Proxies

Rotate IP addresses using proxies to mimic different users accessing the site.

SIP is a virtual telephony service. A proxy server in this case is used to collect traffic, its conversion and further transmission to the subscriber via cellular communication. It is mainly used by call centers to communicate with customers.