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Do you know what to pay attention to when designing a web crawler?

A web crawler, also known as a web spider, is actually an automated web robot that takes the place of a human to access information on the Web. The business and strategy of many enterprises need a lot of multidimensional data analysis, which makes crawler more and more popular. Reptiles are a simple thing to say. But often simple things to achieve the best need to overcome a lot of difficulties. To do a good job of reptiles need to pay attention to a few points, let's take a look at ~. 1. Website management and scheduling. If there are many addresses to access, a URL manager is set up to mark all urls that need to be processed. If the logic is not complex, data structures such as arrays can be used, and if the logic is more complex, databases can be used for storage. One advantage of the database is that when a program hangs unexpectedly, execution can continue based on the ID number it is working on, rather than having to start over and crawl back to a previously processed URL. 2. Data analysis: Data analysis refers to the extraction of the required data from the content returned by the server. The initial approach was to use "regular expressions," a common technique that Python's BeautifulSoup and Requests-HTML are great for extracting content from tags. 3. Dealing with anti-crawler strategies. There are many kinds of strategies for the server to contain crawlers. Every HTTP request has a large number of parameters, and the server can judge whether the request is a malicious crawler according to the parameters. For example, if the Cookie value is incorrect, the server needs values other than Referer and user-agent. At this point, we can check the browser to see what values the server accepts, and then modify the various parameters of the request header in the code to disguise normal access.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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FAQ
22-09-2021

Can the proxy speed up my Internet connection?

1.Yes, proxies can speed up your Internet connection, but you won't notice any significant speed improvements. You can rest assured that the agent will not slow down your computer. This happens because your Internet access is typically slower than the agent's data center.2. You can use proxies to speed up Internet surfing. Ok, how does it work? First, you send the request directly to the proxy server. Second, you may or may not get feedback directly from the proxy server. Whether you get a direct response depends on the proxy server. If the server has cached the required resources on its local hard disk through network caching, the proxy server will provide you with the information you need without making any further requests from the target web site. This process is usually faster than direct access.If you need multiple different proxy IP, we recommend using RoxLabs proxy：www.roxlabs.io

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FAQ
22-09-2021

What are the risks of proxy servers

You do need to be careful when choosing a proxy server: some common risks can negate any potential benefits:1. Risk of free proxy serverUsing one of the many free proxy services can be very risky, even for one that uses an advertising-based revenue model.Free usually means they don't spend a lot of money on back-end hardware or encryption. You may see performance issues and potential data security issues. If you find a completely "free" proxy server, be careful. Some of them just want to steal your credit card number.2. View historyThe proxy server stores your raw IP address and Web request information, possibly unencrypted, locally. Be sure to check whether your proxy servers record and store this data -- and what retention or law enforcement cooperation policies they follow.If you wish to use a proxy server to protect privacy, but the provider simply records and sells your data, you may not receive the expected value of the service.3. Without encryptionIf you use an unencrypted proxy server, it is best not to use one. No encryption means that you send the request in plain text. Anyone listening can easily extract username and password as well as account information. Make sure that any proxy server you use provides full encryption capabilities.If you need multiple different proxy IP, we recommend using RoxLabs proxy：www.roxlabs.io

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FAQ
22-09-2021

How do I test proxy server connections?

1.In Windows, most browsers will use the proxy Settings that are set up on your computer. Each browser has a Settings page to tweak proxy Settings, but they usually only link to Windows' own Settings dialog.2. In Windows 10, there are two ways to change Settings: through the Settings application or through the traditional Control Panel. I'll mention both here because Windows 7, 8, or Windows Vista requires the control panel approach.If you need multiple different proxy IP, we recommend using RoxLabs proxy：www.roxlabs.io

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FAQ
22-09-2021

What is the port for proxy server?

1.In the Port text box, enter the port number used by the proxy server to connect to clients. The default port number is 8080.2. When you connect to the Internet through a proxy, the IP address of the proxy server is displayed instead of your home IP address. Proxy IP addresses are designed to give you more privacy when you surf the Web. A port number is the part of the addressing information used to identify the receiver and sender of a network message. These numbers are also commonly associated with TCP/IP network connections. Port numbers allow different applications on the same computer to share network resources. More importantly, port numbers can start from 0 up to 65535.If you need multiple different proxy IP, we recommend using RoxLabs proxy：www.roxlabs.io

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FAQ
22-09-2021

How is VPN different from proxy?

1.Both VPNS and proxy servers protect user identity and are excellent tools for accessing geographically restricted content. Because both services get the job done, people tend to use them interchangeably. However, one protects your privacy, while the other does not.2.Proxy servers and VPNS both work by connecting you to a remote computer to mask your IP address. However, while both provide the same functionality in this sense, VPN and proxy servers are actually very different. VPNS cost money, but they encrypt your data, while proxy servers offer much less security but typically don't charge users. What's more, proxy servers work only at the application level, where as VPNS protect all your traffic.If you need multiple different proxy IP, we recommend using RoxLabs proxy：www.roxlabs.io

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FAQ
22-09-2021