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This article mainly introduces the python crawler http agent how to use, has a certain reference value, interested friends can refer to, I hope you can learn a lot after reading this article, the following let Xiaobian take you to understand.

At present, many websites have set up the corresponding anti-crawler mechanism. This is because some people collect or attack maliciously in the process of actual anti-crawler sovereignty. Generally speaking, reptile developers are relatively slow to collect data normally, or some reptile developers search the web for free http agents.

However, because the stability and speed of this free http agent are not ideal, how to collect data normally without infringing upon the interests of the other party becomes a problem.

Solution.

1. Use the http proxy to improve the access speed, and the http agent store can increase the buffer to improve the access speed. Usually, the proxy server sets a large buffer.

Through the site information through, save the corresponding information, the next time you visit the same site or the same information, directly call the last information. Secondly, you can hide your real ip to prevent you from being maliciously attacked.

2. Use http proxy to break the IP limit.

When the use of IP resources is too high, continue to collect a large number of stable IP resources, there are many free http proxy resources on the Internet, first of all, it takes time to find, secondly, find a lot, but not necessarily available. Therefore, it is recommended that http agent-51 agent ip crawler agent

The above is about the role of web crawlers using http agent, of course, some people will recommend the use of dialing network or off-network dialing method, but this method ip repetition is more likely.

Expansion of knowledge points:

Agent category

1Jer FTP proxy server: mainly used to access FTP server, generally have upload, download and cache functions, ports are generally 21, 2121 and so on.

2Jing HTTP proxy server: mainly used for accessing web pages, generally has content filtering and caching functions, and ports are generally 80, 8080, 3128, etc.

3TLS proxy: mainly used to access encrypted websites, generally have SSL or TLS encryption function (up to 128bit encryption strength), port is generally 443s.

4Jing RTSP proxy: mainly used to access Real streaming media server, generally has cache function, port is generally 554.

5Telnet agent: mainly used for telnet remote control (hackers often used to hide the identity of the computer), the port is generally 23.

6Gore POP3CompSMTP proxy: it is mainly used for sending and receiving email in POP3/SMTP mode. It generally has caching function. The port is generally 110Comp25.

7Perfect socks proxy: just simply deliver data packets, do not care about the specific protocol and usage, so the speed is much faster, generally has the cache function, the port is generally 1080. SOCKS proxy protocol is divided into SOCKS4 and SOCKS5. The former only supports TCP, while the latter supports TCP and UDP, as well as various authentication mechanisms and server-side domain name resolution. To put it simply, SOCKS5 can do what SOCK4 can do, but SOCK4 can not do what SOCKS5 can do.

Thank you for reading this article carefully. I hope the article "how to use python crawler http Agent" shared by the editor will be helpful to everyone. At the same time, I also hope you will support us and pay attention to the industry information channel. More related knowledge is waiting for you to learn!

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