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What are the anti-crawler strategies and countermeasures?

Due to the continuous development of the Internet, the war between crawler and anti-crawler has never stopped. Today xiaobian for you to share a few complex anti-crawler strategies, let's see ~. 1. Data masquerade. On a Web page, the crawler can monitor traffic and then simulate a normal request from the user. In this example, some sites add complexity by disguising the data. For example, a website with a display price of $299, CSS masquerade for DOM trees. You must do some calculations in the CSS rules to get the correct values. In this case, crawlers have to be very careful, because once the target site is modified, the rules change and the crawler data becomes invalid. 2. Parameter signature. APP calculates request parameters through encryption algorithm to obtain signature. Signatures are typically timestamped and add a timestamp to the request. It works for a short time and is a fixed parameter. After the server sends the request, the server verifies the parameters, timestamp, and compares whether the signatures are consistent. If they are inconsistent, the request is considered illegal. It is often difficult to get encryption algorithms on the APP side, and decompilation is often required to get encryption algorithms. 3. Hide validation. Hiding validation is one of the most complex methods. For example, in terms of protecting websites, JavaScript requests for specific websites can give you specific tokens, so that each request produces a different token. Some sites even add special request parameters to invisible images to determine if they are real browser users. In such cases, it is often not feasible or very difficult to request the API directly, and this can only be avoided by using tools such as ChromeHeadless to simulate the user's behavior. 4. Stop debugging. One of these anti-crawler strategies is special. Once you open the browser's console interface, it triggers the browser's debugging instructions indefinitely. The site adds a debugger for all structural functions, called leonid-tq-jq-v3-min.js, which triggers the debugger when any object is generated. Its purpose is to protect code by preventing unexpected scripts or programs from being used for tracing and debugging. In this case, you can get around this limitation by building a modified JS file, removing the debugger keyword, using mitmProxy to forward traffic, intercepting leonid-tq-jq-v3-min.js, and sending the modified JS file back to the browser. If you need multiple different proxy IP, we recommend using RoxLabs proxy：https://www.roxlabs.io/?, including global Residential proxies, with complimentary 500MB experience package for a limited time.

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Common Problem
22-09-2021

What is a free proxy server?

Free network agents have some limitations. But they are a great choice for users who need short-term anonymity or one-time access to blocked content.Naturally, some agents are much better than their agents. You should research it before you choose to use it. Always adhere to the good reputation of the service. Unidentified or untested agents may not be as effective as advertised and may even be infected with malware.The first feature you should look for in a free web agent is how many servers it has. In the case of multiple choices, there is less chance of a lost connection. If you have several available servers nearby, you may get better network speeds.Not all agencies provide their server details. They don't let you choose what to connect to. If this information is not available, you should be suspicious. But don't shut the service down entirely. If other users have a good experience with this, you might be content to let the server owner pick one for you.The other thing that free web agents focus on is customizability. Every good agent plays the same role as an intermediary in your web browsing. But there are some services that can hide your IP address.Many of the Web proxies recommended in this article encrypt urls and page content for increased security. Many of them offer options to block scripts and objects, increasing the risk of malware infection. Some people also disable cookies to minimize the storage space for their browsing history.Such tools can help you get the most out of Web proxies without paying a reasonable protection fee. But the same tools can often be made more powerful with paid upgrades. If you want the best protection, there's nothing better than a fully tested VPN.If you need multiple different proxy IP, we recommend using RoxLabs proxy：https://www.roxlabs.io/?, including global Residential proxies, with complimentary 500MB experience package for a limited time.

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Common Problem
16-09-2021

What is a proxy server? How does it work?

An Agent server is a machine that converts communication between networks or protocols. This is an intermediate server that separates the end-user client from the browsing target. The Agent server provides different levels of functionality, security, and privacy based on use cases, requirements, or company policies. If a proxy server is used, traffic reaches the desired address through the proxy server. The request is returned through the same proxy server (there are exceptions to this rule), which then forwards the data it receives from the web site to you.Why use a proxy server? Why not return directly from site access?Proxy servers today not only forward Web requests, but also in the name of data security and network performance. Proxy servers act as firewalls and network filters, providing shared network connections and caching data to accelerate common requirements. A good proxy server can protect users and the internal network from network madness. Finally, proxy servers can provide advanced privacy.How do I run the proxy server?Every computer on the Internet needs a unique Internet protocol (IP) address. Make this IP address the street address of your computer. Just as the post office knows how to send your mail to your address, the Internet knows how to send the right data to the right computer via AN IP address.A proxy server is basically a computer on the Internet, and your computer knows your IP address. After a network request is sent, the request reaches the proxy server first. The proxy server then issues the web request for you, collects the web server's response, and forwards the web page data to you so that you can see the page in your browser.When a proxy server forwards your network request, it changes the data you send and still gives you the information you want. The proxy server can change your IP address, so the web server cannot determine your address. The software encrypts the data so that your data cannot be read during transmission. Proxy servers can block access to certain web pages based on IP addresses.If you need multiple different proxy IP, we recommend using RoxLabs proxy：https://www.roxlabs.io/, including global Residential proxies, with complimentary 500MB experience package for a limited time.

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Common Problem
14-09-2021

How to choose high-quality agency service providers

 There are so many proxy server IP addresses on the network, how to analyze and judge? There are so many proxy IP addresses out there. When choosing, how to develop to accurately analyze and judge which agency service providers are quality education professional? Meet the following requirements first.1. Node resources The richer the nodes are, the wider the national distribution is, and the easier it is to simulate real user behavior. The identification of a single node is often limited.2. Proper management ensures stable operation of the IP address pool. Although there are some limitations in use, these are to ensure the stable operation of the IP pool, like traffic lights on the highway.Strong technical force of technology is difficult to fully develop good products. Today there are such problems, tomorrow there are such problems. Users not only have low learning efficiency, but also affect the development progress of the enterprise and the mood of students.4, humanized pre-sale service is of course very important, but after-sales service is more important, no induction, no exaggeration, appearance is consistent, seek truth from facts, try to help users solve problems, rather than talk about him. All of the above can be used as proxy service providers, so you can choose IP tools with confidence.If you need multiple different proxy IP, we recommend using RoxLabs proxy, including global Residential proxies, with complimentary 500MB experience package for a limited time.

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Common Problem
09-09-2021

Can dynamic IP proxy collect data?

How to use dynamic IP proxy to collect data? Web data crawl is the process of getting special content from a web site without requiring the site's API jack to get the content. As part of the website customer experience, web data information, such as a web page of text, images, noise, video and animation, etc., are treated as web data information, but in the whole process, if many applications the same IP practice repeatedly, would be limited, must have application agent to assist at this time, to maximize the efficiency and effect.It's easy and fun for programmers or developers to have the ability to write programs that force them to build a web data crawler flow. But for most people who don't have all the programming expertise, it's best to use some Internet crawler to get specific content from specific web pages.1. Get content from dynamic websites.Web pages can be static or dynamic. Generally speaking, the pages you want to get will change depending on the time you spend browsing the site. Typically, the site is a dynamic web page that uses AJAX techniques or other techniques to instantly upgrade the page. AJAX is a scripting technique for timed loading and multithreading upgrades. Depending on background administration and a small amount of data transfer from the server virtual machine, you can upgrade a portion of a web page without reloading all of them. The main performance is to click an option in the web page, most of the website url remains unchanged; Web pages are not fully loaded, only partially loaded, with some changes.2.Crawl hidden content from web pages.Do you want to get special data information from a website, but if you open a link or hover over a certain point, the content appears? Web sites must be moved by the computer mouse over the selection to display information for classification, so you can set the computer mouse over the connection to crawl hidden content in the web page.3. Get content from endless flipping pages.After flipping to the bottom of the page, some data information you need always appears on some websites. For today's top page, for example, you have to keep flipping to the bottom of the page to load more articles. Endless flipping sites often use AJAX or JavaScript to request additional content from the site. In this case, you can set the AJAX request timeout and choose how and when to flip to get the content from the web page.4. Grab all links from the web page.The average website contains at least one hyperlink. If you want to get all the links from a web page, you can use the proxy mobile software to get all the links posted on the web page.If you need multiple different proxy sevrers, we recommend using RoxLabs proxy, including global Residential proxies, with complimentary 500MB experience package for a limited time.

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Common Problem
08-09-2021

How do I bypass IP ban on Facebook?

You can remove Facebook's IP restrictions by proxy switching IP addresses.If you need to use proxy services, we recommend using Roxlabs agents,RoxLabs not only provides millions of high-quality and stable residential IP resources every day, but also pays more attention to the protection of user privacy and user information security.Proxy services may be needed when you use Facebook in any of the following scenarios:1. Multiple accounts need to be createdTo carry out marketing campaigns, many brands create multiple accounts on Facebook. The platform will limit this behavior, first by IP, so in order to perform multiple account operations, you need to use proxy services.2. Geographical restrictions need to be liftedAlthough Facebook is one of the large social platforms, it is not allowed to be used in many countries. Therefore, the only way to access the social media platform from these locations is to change the IP location. In this case, the role of proxy service becomes particularly important.3. Crawler collection dataSome crawler activities need to visit the platform for many times or with high frequency, and the prohibition of non-user operations on the platform will limit the number of visits within a single IP address. In this case, proxy service is required to constantly change IP addresses for access.4. Check your platform's AD rankingsIf you want to see whether your advertising series ranking is accurate, it is best to change the IP address for query, so that the query results are more accurate.If the IP needs to be an e-commerce platform or social media, consider selecting roxlabs dedicated computer room IP. Fast IP, easy to set, unlimited traffic.More on: Roxlabs proxy 

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Common Problem
02-09-2021