What is cURL: A Practical Manual for Command Line Transport Tools

This thing is called cURL? Don't panic. Here's how to play it.

Programmers will have seen this black window with the command curl -x http://..... In fact, it is our daily operation of the Swiss Army knife, can quietly move data from the server down. But today we are not going to talk about that, we are going to talk about how to make it work with proxy IPs.

Proxy IP meets cURL, how flavorful is that combination?

To give a chestnut, your company to catch the price of competing products, directly on the people's website wild brush, minutes to be pulled black. At this time it is necessary to let the proxy IP as a stand-in actor, each time to change a vest to visit. With ipipgo's proxy pool, you can get theExclusive High Speed IP, much more reliable than the ones that are shared for free.

Don't Shake Your Hands! Three Steps to Matching Agents

Using the HTTP proxy provided by ipipgo as an example, remember this foolproof formula:

curl -x http://用户名:密码@gateway.ipipgo.com:端口 Destination URL

Focus on three pits:
1. When encountering https sites, you have to use-proxy-anyauthparameters
2. Remember to add the -c parameter if you want to save cookies.
3. Don't set the timeout to exceed the length of time given by the proxy service provider (ipipgo defaults to 3 minutes).

When you test it yourself, try httpbin.org/ip first, and it will only be successful if it can return the proxy IP address.

Practical: using ipipgo agent to grab limited shoes

I just wrote the script for a friend last week, and the core code is just four lines:

for i in {1..50}
do
curl -x http://vip123:abcdef@us-west.ipipgo.com:8899 -H "Cookie: session=xxx" https://sneaker.com/new-release
done

The key point is the use of ipipgo'sDynamic session holdThe same agent session can maintain the login status. If you encounter a CAPTCHA, don't be tough, they also have the value-added service of AI coding.

You ask, I answer.

Q: What should I do if the agent suddenly fails to connect?
A: First check ipipgo background usage statistics, if the traffic burst hurry to renew. If not, use curl -v to check the details of the error, common is 407 authentication error, may be the password has a special symbol in the URL code!

Q: How do I measure proxy speed?
A: This combination of commands is recommended:
time curl -x proxy address -o /dev/null -s -w '%{speed_download}' destination URL
ipipgo actually has a latency monitoring panel in the backend, which is a lot less work than measuring manually.

Q: How is enterprise crawler deployed?
A: Buy their houseEnterprise Customized EditionIt supports 500+ proxy connections at the same time. Remember to add -limit-rate 50K speed limit in curl, don't make other people's servers hang!

Honestly, it's hard to move an inch without a proxy these days. Having used 7 or 8 service providers, ipipgo is in theresponsivenessrespond in singingAfter-sales supportOn the really can play. Recently, they are engaged in activities, new users to send 10G flow, fill in the invitation code [CURL666] when registering can also lead to an additional 5G, wool should be gripped on the gripping.