When we run a crawler, it sends requests to target websites and collects data in response. However, some websites may prevent crawlers from accessing their data. At this time, crawlers will return "508 restriction error" for us. So, what does this error code mean? How do we solve it?
In fact, the 508 error code is because our access frequency to the server is too high, so the server rejected our request. This is usually to protect the website from excessive traffic and data loads. Many websites currently in the market place such restrictions to protect their servers and data from malicious crawlers or attacks.
How can we solve this problem? The method is also very simple.
Slow down the request speed of crawlers
Judging from the principle of this error code, it is because the crawler accesses the website too fast, exceeding the carrying capacity of the website, causing the website to fail to respond to the crawler's request normally. In this case, the simplest and straightforward method is to slow down the request speed of the crawler, so as to relieve the pressure on the server from our crawler and avoid exceeding the access limit of the website.
How to slow down crawler requests specifically?
In fact, there are many ways to slow down the speed of crawler requests.
1. You can set a time interval so that your crawler only sends a few requests per second instead of sending a large number of requests in a short period of time. This can reduce the pressure on the server and avoid access restriction errors.
2. You can also control the request speed by adding a delay. For example, you can wait a random amount of time between each request, which can make your crawler look more like a specific user's access behavior.
3. Use a better proxy server. In order to avoid the problem that a certain HTTP proxy is prohibited from accessing, choose a more high-quality HTTP proxy service provider's products.