cURL proxy IP redirection: cURL proxy redirection processing tutorials

Hands-on teaching you to play with cURL proxy IP redirection

The brothers engaged in network development should have encountered this situation: with cURL grab data, the target site gives you a whole redirect, the result of the sudden failure of the proxy IP, the data was not captured but also blocked IP. today we will talk about how to use ipipgo's proxy IP service, the cURL redirection problem of the rule of obedience.

Why does your proxy IP always get redirected to the pits?

Many websites will use 302/301 jumps to counter-crawlers, and at this time, if the proxy IP does not follow the jump, there will beBreak in the request chainThe normal proxies are like dilettantes who just pass the first request. Normal proxies are like dilettantes, they just pass the first request stupidly and get confused when they encounter a jump.

// Typical redirect failures
curl -x 1.2.3.4:8080 http://example.com
// Returns a 302 status code and gets stuck.

First aid kit for cURL proxy setup

Let's start with a combo configuration to tune ipipgo's proxy IP:

curl -x http://username:password@proxy.ipipgo.cc:24000
-L --max-redirs 5
--proxy-anyauth
--connect-timeout 30
http://target-site.com

Parameter descriptions (focus on these):
-L: Automatic tracking redirects (key!)
-max-redirs 5: Up to 5 jumps to prevent deadlock
-proxy-anyauth: Automated Processing Agent Certification

A practical guide to avoiding the pit

Recently, when helping a client do e-commerce price monitoring, I found that a platform uses three levels of jump detection agents. Using ipipgo'sStatic Residential IPIt took working with this configuration to get it done:

curl -x socks5://user:pwd@static.ipipgo.cc:31000
-L --max-redirs 3
-H "User-Agent: Mozilla/5.0 (Windows NT 10.0)"
--retry 2
http://mall.com/product123

It's added here.Customizing the UA headerrespond in singingRetesting mechanismThe reason for this is that some websites will check the integrity of the request header. ipipgo's static IP stability is really top, running for three days without dropping.

Five questions you always ask

Q: What should I do if the proxy IP always fails to authenticate?
A: Check the account package type, dynamic residential IP to bring_geoSuffixes, such asuser_geo

Q: What should I do if I encounter an infinite redirection loop?
A: First withcurl -vLook at the jump path and adjust--max-redirsNumerical value, it is recommended not to exceed 5 times

Q: What should I do with the https website certificate error report?
A: Add in the command--proxy-insecureParameters, or switch to ipipgo's TK line package

Q: What if I need a multi-threaded crawl?
A: Use ipipgo's API to get IP pools in bulk, it is recommended to use the enterprise version of the dynamic residential, remember to bind independent proxies for each thread

Q: Why do you recommend ipipgo?
A: His familycross-border rail lineIt is really stable, the last time to do overseas price comparison project, 200 and sent froze did not trigger the wind control. The package price is also transparent, the cheapest dynamic IP is only 7 yuan more than 1G flow, than self-built proxy pool cost-effective.

There is a way to choose a package

Lastly, a word of caution: encounter complex anti-climbing strategy, directly to the ipipgo technical customer service to be1v1 Customized SolutionsIt saves more time than doing it all by yourself. Last time they gave to do the request header fingerprint simulation program, directly to the collection efficiency increased by 3 times, the key will not be blocked.