How to effectively solve verification codes?

Published Time: 22/01/2024

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Reading time : 5 min read

I understand the challenges that verification codes may pose in automated program development and crawler engineering. The purpose of the verification code is to prevent malicious access to the website by robots and ensure that the user is a real human being and not an automated program.

Verification codes may pose certain obstacles to developers and crawler engineers. When processing verification codes, developers can consider taking reasonable methods to avoid triggering obstacles, such as using IP proxy services.

This article explains how to effectively spot and solve CAPTCHAs.

For developers of automated programs, the main reason for encountering a page verification code is that its behavior triggers the website's security mechanism, usually by sending too many requests and accessing the website in an automated manner.

Ordinary users may only be able to solve the verification codes one by one, but as a programmer, it is necessary to deeply understand the root cause of this problem. When faced with verification codes, developers can take measures to prevent or solve the problem and ensure the normal operation of the program.

What is verification code？

CAPTCHA, which stands for Completely Automated Public Turing test to tell Computers and Humans Apart, sometimes referred to as CAPTCHA, is a challenge response test designed to distinguish whether the user behind Internet traffic is a human or a machine ( computers). This technology was introduced into the online realm in response to the behavior of automated robots.

These bots include various forms such as web scrapers, crawlers, spiders, purchase bots, mass account creation bots, and any other software that sends HTTP requests to the web server without using the official public API provided by the web server administrator.

These bots are known for sending too many requests to a website, which can cause it to crash or increase its running costs, doing nothing to help the sites they visit. However, too many requests are not the only problem associated with bots.

In situations where users are expected to perform certain tasks within a limited time, and where there is fierce competition to purchase limited-edition sneakers, tickets, and other high-demand items, bots may be exploited to gain an improper competitive advantage. Because of these factors and many others, websites employ techniques such as CAPTCHAs to effectively block bots from accessing them.

Type of CAPTCHA to prevent bot access?

When people hear about CAPTCHAs, they often think of them as little more than an "I'm not a robot" checkbox. However, websites employ several CAPTCHA types to ensure the true origin of the request. Understanding these CAPTCHA types is essential to avoid CAPTCHA issues, allowing you to browse the site more efficiently. Each CAPTCHA type is discussed in detail below.

Image verification code

Image CAPTCHAs are one of the most common CAPTCHAs on the Internet and require users to identify objects in an image. Google's reCaptcha offers one of the most effective services out there, although image captchas may pose some challenges for the average user. Image Captcha simplifies image captchas by presenting letters that are easy to read.

Word/mathematical verification code

This type of CAPTCHA requires the user to solve some word or math problems. For example, a captcha might ask you to solve "3 + 5". This form of verification code can take many forms.

Honeypots

Honeypots are a type of CAPTCHA that is difficult to detect because they are hidden by using CSS properties from real users. When a bot interacts with a honeypot, which may be a hidden field in a form or link, it inevitably reveals itself as a bot. Developers need to consider CSS properties and ensure that no elements are interacted with when visibility is off or hidden.

Invisible verification code

Stealth CAPTCHAs are not directly visible; they operate in the background, tracking user behavior to determine if there are requests from bots from certain IPs. Although this is an effective CAPTCHA type, its effectiveness is still questionable as experienced developers can imitate regular users.

Social media login

This verification code type requires the user to log into their social media account. This CAPTCHA method is not popular as users may be hesitant to log into social media on the web.

Time tracking

The way time tracking Captcha works is relatively simple. They just track the speed at which users perform certain actions (such as filling out a form), and can determine whether a robot fills in the form based on the speed of the robot. 3. How to check whether the developed program is blocked by verification code

If you suspect that your bot is being interrupted by a CAPTCHA, you need to look at the response sent back by the web server. Sometimes you don't even reset the verification code in your code; it might just be a persistent timeout error when you can still access the same page using your browser. It's also possible that you're getting some form of 50x error.

How to solve captcha effectively?

When filling out online forms or sending out a lot of typical bot requests, you're likely to encounter CAPTCHAs, sometimes without you even knowing they were triggered. Normally, we can effectively solve the verification code problem through the following method.

Use IP proxy service

An effective way to avoid triggering verification codes is by using an IP proxy service. This includes rotating proxy servers so that websites can help you hide your real IP address and use a different IP address.

At certain intervals or after each request, the proxy server rotates the IP address assigned to your request, making your request appear to the website to have a different IP footprint.

The advantage of this approach is that by using multiple IP addresses, you can spread out your requests and reduce the frequency of access from a single IP, thereby reducing the risk of detection. Rotating proxy services provide developers with an effective means to circumvent the website's protection mechanism against robots that visit too frequently and increase the likelihood of successfully avoiding verification codes.

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How to effectively solve verification codes?

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