Crawler Building Tutorial: A Guide to Building a Crawler from Scratch

Hands-on teaching you to use proxy IP to build a crawler can be small

Engage in crawling is like sending a little brother to borrow things from other people's homes, more often than not, I'm sure to be pulled black. This time you need toproxy IPThis cloak of invisibility, let's take it from our house today.ipipgoof the service as an example to teach you how to play the routine.

Why do I have to use a proxy IP?

Let's take a chestnut: you let the same guy go to the supermarket every day to copy the price 100 times, the third day the security guard absolutely threw him out. The same applies to IP blocking on websites. Using a proxy IP is the same as changing to a different guy to copy prices every day, so you won't be caught out. Especially withipipgoThe dynamic residential IPs live up to the effect of real users surfing the Internet at home.

Proxy Configuration in Four Steps

1. Goipipgo official websiteFor the whole package, newbies are recommended to choosepay per volumeWeed a newcomer's discount to try the water first.
2. get the API interface, Python installed a requests library
3. Add this core configuration to the code:

proxies = {
  "http": "http://用户名:密码@gateway.ipipgo.com:端口",
  "https": "http://用户名:密码@gateway.ipipgo.com:端口"
}

4. Remember the settingsrandom intervalDon't send requests like a machine gun, we recommend using time.sleep to stop randomly for 1-3 seconds.

A practical guide to avoiding the pit

Don't panic when you come across a 403 error, it's 80% that the IP has been recognized. This time to:
- Check if the proxy is working (with the ipipgo backend)connection test(Function)
- Switching IP types, e.g., from a data center IP to a residential IP
- Add a random rotation of User-Agents to disguise different browsers

Here's the kicker.IP Pool ManagementDon't try to use one IP, ipipgo's API supports automatic IP change, set up a 200 requests for IP change strategy, it's very stable.

White Frequently Asked Questions QA

Q: Can't I use a free proxy?
A: Nine out of ten free agents are pits, either as slow as a snail, or the site has long been blacked out. Professional things should be left to theipipgoThis kind of specialized agent, the measured success rate can be ten times worse.

Q: Is it too much trouble to change IP manually every time?
A: Add an auto-switching logic in the code with ipipgo'sDynamic API InterfaceThe specific code templates are readily available in their home documentation.

Q: How can I tell which package to use?
A: Select according to the acquisition frequency:
- Up to 10,000 visits per day: a shared IP pool is sufficient
- High-frequency acquisition: on exclusive IP packages
- Special strict site: on customized residential IPs

How to pick a proxy service provider

There are so many agency service providers on the market, focus on these three things:
1. IP survival time (ipipgo can do it)5-minute automatic replacement)
2. Response speed (measured <80ms for domestic nodes)
3. After-sales support (their technical customer service is still online at 2:00 a.m.)

One final note: Crawling is all about thefig. economy will get you a long wayDon't be greedy and crash people's servers. Use ipipgo's intelligent scheduling strategy, set a reasonable collection frequency, this is the long-term solution. What do not understand directly to the official website to find online customer service, than blindly tossed much stronger.