Chales Proxy

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).

Under such parsing we mean the collection of keywords from services such as Yandex Wordstat. These data will later be required for SEO-promotion of the site. The resulting word combinations are then integrated into the content of the resource, which improves its position in SERPs on a particular topic.

Setting up a proxy server correctly involves choosing the right hardware, selecting a suitable proxy server software, configuring the server, and securing the connection. Here's a step-by-step guide to help you set up a proxy server:

1. Choose the right hardware: Select a server or computer with adequate resources (CPU, RAM, and storage) to handle the expected number of connections and data transfer rates. You may also want to consider using dedicated hardware or a virtual private server (VPS) for better performance and security.

2. Select proxy server software: There are various proxy server software options available, such as Privoxy, Squid, and PacketFence. Choose a software that suits your needs, considering factors like ease of use, performance, and compatibility with your operating system.

3. Install the proxy server software: Follow the instructions provided by the software vendor to install the proxy server software on your chosen hardware. Make sure to download the software from a reputable source and use the latest version to ensure security and compatibility.

4. Configure the server: Configure the proxy server software according to your requirements. This may include setting up the IP address, port number, and authentication methods (e.g., username and password, IP filtering, or HTTP authentication). You can also configure additional settings, such as caching, bandwidth limits, and access control lists.

5. Secure the connection: Ensure that your proxy server is secure by using encryption (e.g., SSL/TLS) and implementing firewalls or intrusion detection systems. Regularly update the software and apply security patches to minimize vulnerabilities.

6. Test the proxy server: Once the server is set up and configured, test its functionality and performance. Verify that it can handle incoming connections, forward requests correctly, and maintain the desired level of anonymity or security.

7. Share the proxy server: If you want to share your proxy server with others, provide them with the IP address, port number, and any necessary authentication credentials. Be cautious when sharing your proxy server, as it can expose your IP address and bandwidth to others, potentially leading to security risks or abuse.

To keep only unique external links while scraping with Scrapy, you can use a set to track the visited external links and filter out duplicates. Here's an example spider that demonstrates how to achieve this:

import scrapy
from urllib.parse import urlparse, urljoin

class UniqueLinksSpider(scrapy.Spider):
    name = 'unique_links'
    start_urls = ['http://example.com']  # Replace with the starting URL of your choice
    visited_external_links = set()

    def parse(self, response):
        # Extract all links from the current page
        all_links = response.css('a::attr(href)').extract()

        for link in all_links:
            full_url = urljoin(response.url, link)

            # Check if the link is external
            if urlparse(full_url).netloc != urlparse(response.url).netloc:
                # Check if it's a unique external link
                if full_url not in self.visited_external_links:
                    # Add the link to the set of visited external links
                    self.visited_external_links.add(full_url)

                    # Yield the link or process it further
                    yield {
                        'external_link': full_url
                    }

        # Follow links to other pages
        for next_page_url in response.css('a::attr(href)').extract():
            yield scrapy.Request(url=urljoin(response.url, next_page_url), callback=self.parse)

- visited_external_links is a class variable that keeps track of the unique external links across all instances of the spider.
- The parse method extracts all links from the current page.
- For each link, it checks if it is an external link by comparing the netloc (domain) of the current page and the link.
- If the link is external, it checks if it is unique by looking at the visited_external_links set.
- If the link is unique, it is added to the set, and the spider yields the link or processes it further.
- The spider then follows links to other pages, recursively calling the parse method.

Remember to replace the start_urls with the URL from which you want to start scraping.

It is necessary to go to "Settings", select "WiFi", then specify the network for which you want to disable the proxy. After that, tap on "Proxy settings" and check "Off". This option is valid for iOS version 10 and higher.