🕷️ Xcrap Impit Client

Xcrap Impit Client is a package within the Xcrap framework that implements an HTTP client using the Impit library.

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📦 Installation

Installation is straightforward; just use your preferred dependency manager. Here's an example using NPM:

npm i @xcrap/impit-client @xcrap/core @xcrap/extractor

You also need to install @xcrap/extractor and @xcrap/core because they are listed as peerDependencies. This means the package requires @xcrap/extractor and @xcrap/core, but it will use the versions that the user has installed in their project.

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🚀 Usage

Like all HTTP clients, ImpitClient has two methods: fetch() to make a request to a specific URL and fetchMany() to make requests to multiple URLs simultaneously, with control over concurrency and delays between requests.

Usage Example

import { ImpitClient } from "@xcrap/impit-client"
import { extract, css } from "@xcrap/extractor"

;(async () => {
    const client = new ImpitClient()
    const url = "https://example.com"
    const response = await client.fetch({ url: url })
    const parser = response.asHtmlParser()
    const pageTitle = await parser.extractValue({ query: css("title"), extractor: extract("innerText") })

    console.log("Page Title:", pageTitle)
})();

Adding a Proxy

In an HTTP client that extends BaseClient, you can add a proxy in the constructor as shown in the following examples:

1. Providing a proxy string:

   const client = new ImpitClient({ proxy: "http://47.251.122.81:8888" })

2. Providing a function that generates a proxy:

   function randomProxy() {
   	const proxies = [
   		"http://47.251.122.81:8888",
   		"http://159.203.61.169:3128"
   	]
   
   	const randomIndex = Math.floor(Math.random() * proxies.length)
   
   	return proxies[randomIndex]
   }
   
   const client = new ImpitClient({ proxy: randomProxy })

Using a Custom User Agent

In a client that extends BaseClient, you can also customize the User-Agent for requests. You can do this in two ways:

1. Providing a userAgent string:

   const client = new ImpitClient({ userAgent: "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/134.0.0.0 Safari/537.36" })

2. Providing a function that generates a userAgent:

   function randomUserAgent() {
   	const userAgents = [
   		"Mozilla/5.0 (iPhone; CPU iPhone OS 9_8_4; like Mac OS X) AppleWebKit/603.37 (KHTML, like Gecko)  Chrome/54.0.1244.188 Mobile Safari/601.5",
   		"Mozilla/5.0 (Windows NT 10.3;; en-US) AppleWebKit/537.35 (KHTML, like Gecko) Chrome/47.0.1707.185 Safari/601"
   	]
   
   	const randomIndex = Math.floor(Math.random() * userAgents.length)
   
   	return userAgents[randomIndex]
   }
   
   const client = new ImpitClient({ userAgent: randomUserAgent })

Using a Custom Proxy URL

In a client that extends BaseClient, you can use proxy URLs. While the exact explanation of how they work might be complex, I encountered this type of proxy when trying to solve CORS issues by making client-side requests, and that's how I learned about CORS Proxy. Here's a template for a CloudFlare Workers implementation if you want to set up your own.

You can configure this in the same way we configured userAgent:

1. Providing a proxyUrl string:

   const client = new ImpitClient({ proxyUrl: "https://my-proxy-app.my-username.workers.dev" })

2. Providing a function that generates a proxyUrl:

   function randomProxyUrl() {
   	const proxyUrls = [
   		"https://my-proxy-app.my-username-1.workers.dev",
   		"https://my-proxy-app.my-username-2.workers.dev"
   	]
   
   	const randomIndex = Math.floor(Math.random() * proxyUrls.length)
   
   	return proxyUrls[randomIndex]
   }
   
   const client = new ImpitClient({ proxyUrl: randomProxyUrl })

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🧪 Tests

Automated tests are located in __tests__. To run them:

npm run test

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🤝 Contributing

Want to contribute? Follow these steps:

• Fork the repository.
• Create a new branch (git checkout -b feature-new).
• Commit your changes (git commit -m 'Add new feature').
• Push to the branch (git push origin feature-new).
• Open a Pull Request.

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📝 License

This project is licensed under the MIT License.