Why Is My Bot Or Crawler Being Detected While Web Scraping And How Do I Avoid This?

Learn how to easily and successfully navigate your data mining through the online environment by following these simple steps.
Why and how to avoid: Bot crawling being detected when web scraping and collecting data
Rachel Hollander
Rachel Hollander | Content Marketing Manager
21-Jan-2019

With the rising need to collect vast amounts of accurate information, web scraping crawlers are becoming extremely common. Sites are catching on and implementing their own firewalls to block your data extraction efforts.

How does my target website know I am data mining?

This is mostly due to cookies, the browser user-agent, and your IP.

When web scraping/crawling your target website, the website saves cookies on your browser. The website recognizes a real browser by reading the request headers which include information about the user-agent. It also pays attention to the number of requests sent per IP, per minute. A crawler allows you to make many requests at a much faster rate than a human, which your target website will detect. Too many requests, a lack of cookies and/or an incorrect user-agent will trigger a website to provide an error response, print out misleading information or block you completely.

 
Head of the browser under the magnifying glass to reveal it is a bot

How do I avoid being detected while web scraping?

This can be avoided by programming the user-agent header (comprised of the browser type and version) to be seen as a real browser while maintaining the session cookies throughout the same session. When beginning a new session, clear the cookies and start again.

However, the most important aspect when avoiding detection is your IP address.

Your IP address is the one thing that can’t be coded as it is part of the network infrastructure.
To mimic a real-user, you need to limit the number of requests per IP. This is done by continuously rotating the IP address and is easily done using Bright Data’s Proxy Network. Not only the largest residential network in the world, but it also has the first Proxy Manager offering built-in automated proxy manipulations based on your specifications.

By properly managing your cookies, user-agent and IP you can avoid getting captchas, being blocked or fed misleading information by a target website while web scraping.

Rachel Hollander
Rachel Hollander | Content Marketing Manager

You might also be interested in

What is data aggregation

Data Aggregation – Definition, Use Cases, and Challenges

This blog post will teach you everything you need to know about data aggregation. Here, you will see what data aggregation is, where it is used, what benefits it can bring, and what obstacles it involves.
What is a data parser featured image

What Is Data Parsing? Definition, Benefits, and Challenges

In this article, you will learn everything you need to know about data parsing. In detail, you will learn what data parsing is, why it is so important, and what is the best way to approach it.
What is a web crawler featured image

What is a Web Crawler?

Web crawlers are a critical part of the infrastructure of the Internet. In this article, we will discuss: Web Crawler Definition A web crawler is a software robot that scans the internet and downloads the data it finds. Most web crawlers are operated by search engines like Google, Bing, Baidu, and DuckDuckGo. Search engines apply […]

A Hands-On Guide to Web Scraping in R

In this tutorial, we’ll go through all the steps involved in web scraping in R with rvest with the goal of extracting product reviews from one publicly accessible URL from Amazon’s website.

The Ultimate Web Scraping With C# Guide

In this tutorial, you will learn how to build a web scraper in C#. In detail, you will see how to perform an HTTP request to download the web page you want to scrape, select HTML elements from its DOM tree, and extract data from them.
Javascript and node.js web scraping guide image

Web Scraping With JavaScript and Node.JS

We will cover why frontend JavaScript isn’t the best option for web scraping and will teach you how to build a Node.js scraper from scratch.
Web scraping with JSoup

Web Scraping in Java With Jsoup: A Step-By-Step Guide

Learn to perform web scraping with Jsoup in Java to automatically extract all data from an entire website.
Static vs. Rotating Proxies

Static vs Rotating Proxies: Detailed Comparison

Proxies play an important role in enabling businesses to conduct critical web research.