Target Proxy

To scrape images in C#, you can use the HTMLAgilityPack library for parsing HTML and retrieving image URLs. Here's a basic example

Install HTMLAgilityPack

You can install the HTMLAgilityPack NuGet package using the following command in the Package Manager Console:

Install-Package HtmlAgilityPack

Write a C# script to scrape images:

using System;
using System.Collections.Generic;
using HtmlAgilityPack;

class Program
{
    static void Main()
    {
        string url = "https://example.com"; // Replace with the URL of the page you want to scrape images from

        // Download HTML content from the URL
        HtmlWeb web = new HtmlWeb();
        HtmlDocument document = web.Load(url);

        // Extract image URLs
        List imageUrls = ExtractImageUrls(document, url);

        // Print the extracted image URLs
        foreach (string imageUrl in imageUrls)
        {
            Console.WriteLine(imageUrl);
        }
    }

    static List ExtractImageUrls(HtmlDocument document, string baseUrl)
    {
        List imageUrls = new List();

        // Select image elements using XPath
        var imageElements = document.DocumentNode.SelectNodes("//img[@src]");

        if (imageElements != null)
        {
            foreach (var imageElement in imageElements)
            {
                // Extract image URL from the src attribute
                string imageUrl = imageElement.GetAttributeValue("src", "");

                // Make the URL absolute if it's a relative URL
                imageUrl = new Uri(new Uri(baseUrl), imageUrl).AbsoluteUri;

                // Add the URL to the list
                imageUrls.Add(imageUrl);
            }
        }

        return imageUrls;
    }
}

This script uses HTMLAgilityPack to load the HTML content of a webpage and extract image URLs using XPath. The ExtractImageUrls method selects image elements with the XPath query "//img[@src]", retrieves the src attribute, and converts relative URLs to absolute URLs.

Run the script:

Replace the url variable with the URL of the webpage you want to scrape images from.

Run the script to see the list of image URLs.

If you can't download images in Scrapy:

- Check the image pipeline configuration in settings.py.
- Verify HTTPS compatibility and install the certifi package if necessary.
- Confirm the correctness of XPath or CSS selectors for image URLs.
- Ensure image URLs are in the correct format; log URLs for inspection.
- Handle redirects by setting REDIRECT_ENABLED = True.
- Check and set appropriate HTTP headers in your Scrapy spider.
- Adjust the CONCURRENT_REQUESTS setting to avoid server restrictions.
- Verify correct configuration of the ImagesPipeline.
- Inspect the downloaded images in the specified IMAGES_STORE directory.
- Implement exception handling in your spider to catch download errors.

To save the results of two Scrapy spiders into one JSON file, you can follow these general steps:

Run Both Spiders:
Run both Scrapy spiders separately to generate their respective output files. Let's assume you have two spiders named spider1 and spider2.

scrapy crawl spider1 -o output1.json
scrapy crawl spider2 -o output2.json

Merge JSON Files:
After running both spiders, you can merge the contents of the two JSON files into a single file using various methods. One way is to use a scripting language like Python.

import json

# Read the contents of both JSON files
with open('output1.json') as f1, open('output2.json') as f2:
    data1 = json.load(f1)
    data2 = json.load(f2)

# Combine the data from both spiders
combined_data = data1 + data2

# Write the combined data to a new JSON file
with open('combined_output.json', 'w') as combined_file:
    json.dump(combined_data, combined_file, indent=2)

Save this Python script (e.g., merge_json.py) in the same directory as the JSON files, and then run it:

python merge_json.py

This script reads the contents of both JSON files, combines the data, and writes the result into a new file (combined_output.json).

Verify the Result:
Check the combined_output.json file to ensure that it contains the merged data from both spiders.

A proxy server is a kind of "mediator" between your equipment and a remote server (or the whole Internet). It can be used, for example, to swap your real IP address for another one, to bypass blocking. Proxies can also be actively used to intercept traffic (e.g. when testing created web applications).

Open the Chrome preferences screen, and then, expanding the advanced settings menu, click on the "Advanced" section. Open the "System" item, then on the tab that opens, click on "Open proxy settings for computer". The proxy settings interface will appear in front of you. This will be either the "System Settings" application or the "Browser Properties" application, depending on your operating system.