The Good Tech Companies - The Best User Agent for Web Scraping

Episode Date: October 15, 2024

This story was originally published on HackerNoon at: https://hackernoon.com/the-best-user-agent-for-web-scraping. Learn why you should set a user agent when scraping the web and discover the best user agent for web scraping Check more stories related to programming at: https://hackernoon.com/c/programming. You can also check exclusive content about #web-scraping, #user-agent, #anti-bot, #data-scraping, #http, #http-headers, #good-company, #what-is-a-user-agent, and more. This story was written by: @brightdata. Learn more about this writer by checking @brightdata's about page, and for more stories, please visit hackernoon.com. The User-Agent header is like a digital ID that tells servers about the software making an HTTP request. In web scraping, setting and rotating user agents is crucial to avoid detection and bypass anti-bot systems. By mimicking real user agents from browsers and devices, you can make your scraping requests appear more genuine.

This audio is presented by Hacker Noon, where anyone can learn anything about any technology. The best user agent for web scraping, by Bright Data. Ever wondered how software introduces itself to servers? Enter the header, a digital ID that reveals crucial details about the client making an HTTP request. As you're about to learn, setting a user agent for scraping is a must. In this article, we'll break down what a user agent is, why it's vital for web scraping, and how rotating it can help you avoid detection. Ready to dive in? Let's go!

What's a user agent? The is a popular HTTP header automatically set by applications and libraries when making HTTP requests. It contains a string that spills the beans about your application, operating system, vendor, and the version of the software making the request. That string is also known as a user agent or UWA, but why the name, user agent, simple. In IT lingo, a user agent is any program, library, or tool that makes web requests on your behalf. A closer look at a user agent string hears what the UWA string set by Chrome looks like these days. If you're baffled by that string, you're not alone. Why would a Chrome user agent contain words like Mozilla and Safari? Exploding head well, there's a bit of history

behind that, but honestly, it's easier to justerly on an open source project like user agent string. Calm, just paste a user agent there, and you'll get all the explanations you ever wondered about. It all makes sense now, doesn't it? Checkmark the role of the user agent header, think of a user agent like a passport that you, the client, present at an airport, the server. Just as your passport tells the officer where you're from and helps them decide whether to allow your entry, a user agent tells a site, hey, I'm Chrome on Windows, version XYZ. This little introduction helps the server determine how and if to handle the request. While a passport holds personal information like your name, birth date, and place

of birth, a user agent provides details about your requesting environment. Great, but what kind of information? Thinking face well, it all depends on where the request is originating from. Browsers. The header here is like a detailed dossier, packing in the browser name, operating system, architecture, and sometimes even specifics about the device. HTTP client libraries or desktop applications that provide just the basics, the library name, and occasionally the version. Why setting a user agent is key in web scraping? Most sites have anti-bot and anti-scraping systems in place to safeguard their web pages and data. Shield these protection technologies keep a sharp eye on incoming HTTP requests, sniffing out inconsistencies and bot-like patterns.

When they catch one, they don't hesitate to block the request and may even blacklist the IP address of the culprit for their malicious intentions. Is one of the HTTP headers that these anti-bot systems scrutinize closely? After all, the string in that header helps the server understand whether a request is coming from a genuine browser with a well-known user agent string. No wonder is one of the most important HTTP headers for web scraping. Man-detective the workaround to avoid blocks? Discover user agent spoofing. By setting a fake UUA string, you can make your automated scraping requests appear as coming from a human user in a regular browser. This technique is like presenting a fake ID to get past security.

Don't forget that is nothing more than an HTTP header. So, you can give it whatever value you want. Changing user agent for web scraping is an old that trick helps you dodge detection and blend in as a standard browser. Ninja wondering how to set a user agent in popular HTTP clients and browser automation libraries. Follow our guides. Curl user agent guide, setting and changing. Python requests user agent guide, setting and changing. Selenium user agent guide, setting and changing. Node.js user agent guide, setting and changing. Postman user agent guide, setting and changing. Best user agent for scraping the internet. Who's the king of user agents when

it comes to web scraping? Crownwell, it's not exactly a monarchy but more of an oligarchy. There isn't one single user agent that stands head and shoulders above the rest. Actually, any UA string from modern browsers and devices is good to go. So, there's not really a best user agent for scraping. The user agents from the latest versions of Chrome, Firefox, Safari, Opera, Edge, and other popular browsers on macOS and Windows systems are all solid choices. The same goes for the UA of the latest versions of Chrome and Safari Mobile on Android and iOS devices. Here's a hand-picked list of user agents for scraping. Of course, this is just the tip of the iceberg, and the list could go on and on.

For a comprehensive and up-to-date list of user agents for scraping, check out sites like WhatIsMyBrowser.com and User Agents.me. Learn more in our guide on user agents for web scraping. Avoid bans with user agent rotation. So, you're thinking that just swapping your HTTP client library's default with one from a browser might do the trick to dodge anti-bot systems? Well, not quite, if you're flooding a server with requests with the same and from the same IP. You're basically waving a flag that says, look at me, I'm a bot. Robot to up your game and make it harder for

those anti-bot defenses to catch on, you need to mix things up. That's where user-agent rotation comes in. Instead of using a static, real-world, switch it up with each request. This technique helps your requests blend in better with regular traffic and avoids getting flagged as automated. Here are high-level instructions on how to rotate user-agents. 1. Collect a list of user-agents. Gather a set of UUA strings from various browsers and devices. 2. Extract a random user agent. Write simple logic to randomly pick a user agent string from the list. 3. Configure your client. Set the randomly selected user agent string in the header of your HTTP client. Backslash dot. Now, worried about keeping your list of user agents fresh, unsure how to implement rotation, or concerned that advanced anti-bot solutions might still

block you? Weary those are valid worries, especially since user agent rotation is just scratching the surface of avoiding bot detection. Put your worries to rest with bright data's web unlocker. http://www.youtube.com.watch.v equals 1srjvbbupk8 and embeddable equals true this AI-powered website unlocking API handles everything for you. User agent rotation, browser fingerprinting, captcha solving, IP rotation, retries, end of inScript rendering. Final thoughts. The header reveals details about the software and system making an HTTP request. You now know what the best user agent for web scraping is and why rotating it is crucial.

But let's face it, user agent rotation alone won't be enough against sophisticated bot protection. Want to avoid getting blocked ever again? Embrace Web Unlocker from Bright Data and be part of our mission to make the internet a public space accessible to everyone, everywhere, even through automated scripts. Until next time, keep exploring the web with freedom. Thank you for listening to this HackerNoon story, read by Artificial Intelligence. Visit HackerNoon.com to read, write, learn and publish.