How do I manage proxies with Kanna for web scraping?

Kanna is a Swift library for parsing HTML and XML, mainly used for iOS and macOS application development. It doesn't have built-in support for web scraping, networking, or proxy management. However, when you are doing web scraping in a Swift environment, you might be using URLSession for networking tasks. Managing proxies with URLSession can be done using URLSessionConfiguration.

If you want to configure proxies for your web scraping task in a Swift application using Kanna to parse the scraped content, you will have to set the proxy settings in the URLSessionConfiguration object. Here's an example of how you could configure a session with proxy settings:

import Foundation

let proxyHost = "your.proxy.host"
let proxyPort = 1234

let configuration = URLSessionConfiguration.default

configuration.connectionProxyDictionary = [
    kCFNetworkProxiesHTTPEnable as AnyHashable: true,
    kCFNetworkProxiesHTTPProxy as AnyHashable: proxyHost,
    kCFNetworkProxiesHTTPPort as AnyHashable: proxyPort,
    kCFStreamPropertyHTTPSProxyHost as AnyHashable: proxyHost,
    kCFStreamPropertyHTTPSProxyPort as AnyHashable: proxyPort
]

let session = URLSession(configuration: configuration)

let url = URL(string: "https://example.com")!
let task = session.dataTask(with: url) { data, response, error in
    if let error = error {
        print("Error: \(error)")
    } else if let data = data, let htmlString = String(data: data, encoding: .utf8) {
        // Use Kanna to parse htmlString
        // ...
    }
}

task.resume()

In this example, the URLSessionConfiguration object is being configured with a dictionary that specifies the proxy settings for both HTTP and HTTPS connections. The kCFNetworkProxiesHTTPEnable key is set to true to enable proxy, and the kCFNetworkProxiesHTTPProxy, kCFNetworkProxiesHTTPPort, kCFStreamPropertyHTTPSProxyHost, and kCFStreamPropertyHTTPSProxyPort keys are used to set the proxy host and port.

After setting up the proxy, you create a URLSession with the configuration and proceed with making your requests. Any data fetched can then be parsed using Kanna.

Please note that managing proxies in this way does not anonymize your traffic or protect you from all types of tracking. If the target website employs sophisticated measures to detect scraping, you may need to implement more advanced techniques, such as rotating proxies and user agents, to avoid detection and potential blocking.

Keep in mind that web scraping must be done in compliance with the terms of service of the websites you are targeting, and you should respect robots.txt files and any other indications that the website owner does not wish to be scraped.