Web Crawler Tools: Proxy Web Crawler Tools

Why is your crawler always blocked? Try this wild trick

Crawler old iron must have encountered such a situation: obviously the code is written smoothly, the results of running the target site will give you a pinch line. At this time do not rush to doubt life, eighty percent of your IP address was targeted by others. Like going to the supermarket to try to eat can not always use the same face, crawl data must also learn to "change face".

To give a real case: last year there is a small team of e-commerce price comparison, they use a fixed IP to catch the price of a platform, the first three days of smooth sailing, the fourth day suddenly found the return of all 404. later replaced with a dynamic proxy IP pool, the amount of data obtained directly five times. Here to say the doorway is -A good crawler is a good crawler that can change its face.The

Hands-On Masking of Reptiles

Add proxy IP to the crawler is actually the same as a cell phone to change the SIM card a reason, here to Python's requests library as an example:

import requests

 Proxy address from ipipgo
proxy = {
    "http": "http://username:password@gateway.ipipgo.com:9020",
    "https": "http://username:password@gateway.ipipgo.com:9020"
}

response = requests.get('destination URL', proxies=proxy, timeout=10)

Note that there are two potholes here:timeout settingNever forget, 5-10 seconds is recommended;Certification InformationYou have to fill in the format given by the service provider. If you have used ipipgo, you should know that the format of their proxy address is special, with an exclusive gateway address, this design is really more convenient than some platforms.

Choosing a proxy IP is like buying groceries. It's all about freshness.

Here I want to praise ipipgo's intelligent switching function, which can automatically match the IP type according to the anti-climbing strategy of the target website. The last time I helped a customer do real estate data collection, using their dynamic residential IP pool, ran continuously for 72 hours without triggering any verification, it is really something.

A practical guide to avoiding the pit

Three common mistakes newbies make:

1. IP reuse overkillDon't catch an IP and use it to death, it is recommended to visit a single IP for at least 30 seconds.
2. Incomplete header informationRemember to bring your User-Agents. It's best to have more than 10 groups ready to rotate.
3. No verification of agent quality: It is recommended to use httpbin.org/ip to check whether the IP is valid before each request

Recently found ipipgo background new IP health monitoring, can real-time display IP response speed and success rate, this feature is particularly useful to do distributed crawler team.

QA time

Q: What should I do if my proxy IP fails frequently?
A: It is recommended to use dynamic proxy pools, like ipipgo's enterprise version supports automatic IP switching per second, and can also set up a failure automatic retry mechanism.

Q: How do I break the CAPTCHA when I encounter it?
A: Prioritize reducing the frequency of requests and use it with residential proxy IPs. ipipgo's residential IP library has a pass rate of more than 90%, which is more reliable than ordinary IPs in the server room.

Q: Slower data capture?
A: Check the geographic location of the proxy server and select the proxy node in the region where the target website is located. For example, don't use overseas IP if you catch domestic websites, this can be directly filtered geography in ipipgo background.

Finally, a word of truth.The market agent service providers are a mixed bag, some cheap packages look cost-effective, the actual use of all the pits. It is recommended to try before you buy, like ipipgo newcomer 3 yuan experience package, enough to measure the quality of service. After all, the success or failure of the reptile project, sometimes in the proxy IP on this link.