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How do crawlers get data from web pages?

To build a web crawler, web page download is an essential step. This is not easy because there are many factors to consider, such as how to make better use of local bandwidth, how to optimize DNS queries, and how to allocate network requests to free up traffic on the server. 1. Complex analysis of HTML pages. In fact, we can't directly access all HTML web pages. There is also the problem of retrieving javascript-generated content in a dynamic web site using AJAX. In addition, crawler traps often occur on the network, causing numerous requests or crawler crashes. 2. While there are many things you should know when building a Web crawler, most of the time you just want to create a crawler for a specific site. Not generic programs like Google crawlers. Therefore, it is best to do in-depth research on the target site, select valuable links to track, and avoid the extra cost of redundant or spam urls. In addition, if the right web crawl path can be found, the content of interest to the target site can be captured in a predefined order. The above mentioned is how to crawl data on the web page, crawler crawl data need to break the IP limit, you can consider using proxy IP.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
24-09-2021

What are the VPN types

Here are some important VPN types:1. Remotely access the VPNA remote access VPN helps users connect to a virtual private network and remotely access all of its services and resources.The connection tunnel between the user and the virtual private network is established over the Internet. This makes the connection completely private and secure. This type of VPN is useful for both home and business users.2. Site-to-site VPNSite-to-site VPNS are also known as router-to-router VPNS. It is mainly used by large companies or organizations with offices in different locations. This helps companies connect networks from one office to another.3. OpenVPN:OpenVPN is an open source VPN that allows the use of a wide range of encryption algorithms.4. The PPTP:PPTP is a VPN that is fast and easy to set up but very insecure.5. L2TP:It is secure and easy to start, but slower than OpenVPN.6. LKEV2:Compared with PPTP and L2TP, this type of VPN server is faster. It supports AES 128, AES 192, AND AES G56. However, it is not supported on many platforms.If you need multiple different proxy IP, we recommend using RoxLabs proxy：www.roxlabs.io

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FAQ
24-09-2021

What is proxy?

1.A proxy server is a computer that acts as an intermediary between your computer and the Internet. Any traffic routed through the proxy server appears to come from its IP address, not from your computer. Your browser connects to the proxy, and the proxy connects your browser to the Internet. Proxy servers communicate with the Internet using one of two different protocols: HTTP or SOCKS.2. Proxy servers act as a bridge between the Web site you are visiting and your computer system. Your network traffic goes through a middleman, a remote machine that helps you connect to the host server.If you need multiple different proxy IP, we recommend using RoxLabs proxy：www.roxlabs.io

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FAQ
24-09-2021

What is a VPN?

1.Virtual private networks create an encrypted "tunnel" between computer devices and host servers. A VPN is a private network that uses a public network to connect to remote sites or users. VPN networks use "virtual" connections routed over the Internet to remote sites from corporate private networks or third-party VPN services.2. Your ISP or government agency can only see that you are connected to a VPN server, but cannot track your activities or IP addresses that you have accessed. With the help of 128-bit encryption, all data is completely hidden.If you need multiple different proxy IP, we recommend using RoxLabs proxy：www.roxlabs.io

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FAQ
24-09-2021

Can proxy and VPN be used together?

1.If you have a VPN, you do not need to use a proxy server. Both proxy servers and VPNS mask your IP identity.2. So there's no reason to use them together. In fact, if you're already using a VPN, connecting to a website or application via a proxy server just adds an unnecessary extra step and may even slow down without adding any additional security.That being said, if you feel the need to take additional steps to protect your anonymity, you can use both.If you need multiple different proxy IP, we recommend using RoxLabs proxy：www.roxlabs.io

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FAQ
24-09-2021

Which is more secure, proxy or VPN?

1.VPNS are much more secure than proxy servers. While both mask your IP address, the VPN actually encrypts all the data you send and receive. As a result, VPNS are much better at providing online protection than proxy servers that don't provide any encryption.2. All the broker does is pass your traffic through the mediation server. Therefore, this does not necessarily provide you with any additional protection. And you will have no way of knowing what the proxy server will do with any data it collects during your online activities. But the information could be sold to third parties.3. It's also worth noting that VPNS, unlike proxies, work at the operating system level to protect all your traffic, making them more secure than using proxy servers.If you need multiple different proxy IP, we recommend using RoxLabs proxy：www.roxlabs.io

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FAQ
24-09-2021