Application of the cURL -d parameter to proxy IPs: The cURL -d parameter is submitted using proxy IPs.

Hands-on with proxy IP to play with the -d parameter of cURL

The old iron have engaged in data submission know that the -d parameter of cURL is like a courier, specifically responsible for the data package to the target server. But sometimes the target site on the courier to check strictly, this time you need to give the courier to wear a "cloak" - that is, proxy IP.ipipgoThe proxy service is specifically tailored to this scenario.

Why do you have to use a proxy IP to send data?

Let's take a chestnut: you want to send a login request to a certain website, directly use your own IP to send dozens of times, and you will be blacklisted in minutes. If you useipipgoThe proxy pool, each request for a new IP, like playing Sichuan opera face, the site simply can not feel your real way.

curl -X POST -d "user=admin&pass=123456" http://example.com/login
--proxy http://user:password@proxy.ipipgo.io:9020

The Three Minefields of Configuring Proxies

The easiest place for a novice to fall:

1. Wrong proxy format: don't write socks5 as an http protocol, it's like filling up a gasoline car with diesel fuel!
2. Omission of authentication information::ipipgoThe agents are required to bring the account password, missing the direct 403
3. Timeout set too short: It is recommended to set at least 30 seconds to give the proxy server enough time to react.

Practical case: simulated form submission

Suppose you want to send a product review to an e-commerce site, using theipipgoof the dynamic residential IP polling operation:

for i in {1..10}
do
  curl -d "rating=5&comment=good" https://shop.com/review
  --proxy http://user:pass@rotate.ipipgo.io:9021
  sleep $((RANDOM%5+1))
done

QA time: the pitfalls you may have encountered

Q：Why does it still show the real IP after I set the proxy?
A: 80% is that the agent is not effective, first use thecurl --proxy "" ifconfig.meCheck to see if you're going through a proxy.

Q: What should I do if the POST request returns a 405 error?
A: Remove the proxy first and test the -d parameter alone, sometimes the target server limits the request method

Q: WithipipgoDo I need to configure a special proxy for the
A: Remember to fill in the authorization information in the proxy address in a format like this: http://账号:密码@gateway address:port

The doorway to choosing a proxy service

Not all proxies are suitable for sending POST requests, focusing on three metrics:

ipipgos business-grade agents excel in these three areas, and are especially suited to scenarios that require consistent data submission.

The ultimate reminder: safe operating positions

1. Sensitive data remember to do URL encoding first
2. Important operations to open proxy + HTTPS double insurance
3. Long-term missions should be configured for automatic IP changes
4. Don't be tough when encountering CAPTCHA, don't hesitate to go to a coding service.

If you're still confused after reading this, go straight to theipipgoThe technical manuals are written in more detail than the recipes. Remember that playing around with the -d parameter of cURL is like stir-frying a dish, you can't do it without fire (proxy quality) and seasoning (parameter configuration).