How python crawlers use http agents

Editor to share with you how the python crawler uses the http agent, I believe most people do not know much about it, so share this article for your reference, I hope you can learn a lot after reading this article, let's learn about it!

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

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