There are many businesses or web pages on the Internet that do not require users to log in. These no-log pages often contain a lot of aggregated information, such as news portals. Video portal. Search engine. This information is public and can be captured by crawlers.
Why should the website be anti-crawler?
1. Crawler accounts for a high proportion of total PV, resulting in a waste of server resources.
The cost of using the program to make URL request to obtain data is very low, which leads to a large number of low-quality web crawlers running rampant on the network, resulting in a large number of visits to the target website, resulting in a large consumption of server resources, at least affecting the access speed of normal users, and at worst leading to the unavailability of website services.
2. The resources that the company can query for free are acquired in batches, losing competitiveness.
The price of many software can be directly queried in non-login state, if no worries, competitors can batch copy web page information, grab the price of software. Resources and other information, over a long period of time, the competitiveness of enterprises will be greatly reduced.
What kind of reptile are we fighting?
1, malicious competition, scalpers use malicious reptilian cross Airlines low ticket, at the same time launched a batch of machine requests to occupy seats.
As a result, the continuous occupation of flight seat resources leads to waste, and eventually leads to the high vacancy rate of flights, which brings business losses to airlines and damages the interests of normal users.
2. No one wants to stop themselves. Nearly 60% of Internet traffic is caused by crawlers.
The site has placed restrictions on these crawlers. To prevent crawlers from retrieving data. The reptile works tirelessly even as it grabs data. That's because some crawlers reside on a server and are unclaimed.
3. Competitors: Companies need data to analyze user behaviors, defects of their own products and information about competitors.
Will crawl through the information of competitors, such as e-commerce sites. Recruitment websites will crawl competitors' product information. In order to ensure the competitiveness of their products, enterprises often target such crawler products.
4. Website clicks.
The purpose of advertising is often to reach potential consumers in line with website positioning. However, due to click fraud caused by malicious crawler, the click rate of advertisement is inflated, so that the website bears the click cost that should not be borne, and brings the actual profit loss to the website.
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