cURL -X POST Command: cURL POST Request Explained

Journeyman's Rescue! Hands-on teaching you to play with cURL POST request

Attention all coders! Today, let's talk about how to use cURL to send a POST request to a proxy IP, which is easy to say simple, but also difficult to say easy to step on the pit. Don't panic, I'll put the bottom of the box of practical experience to shake out, to ensure that you can immediately get started after reading.

I. POST request basic operation

First of all, the whole basic skills, curl this thing to send a POST request in fact, on the three axes:

curl -X POST https://example.com/login
  -d "username=Lao Wang&password=123456"

Watch this.-X POSTIt can actually be omitted, because when using the-dThe default parameter is POST, but we old drivers are used to write it in full, so it makes more sense, right?

Second, the correct way to open the proxy IP

Here's the kicker! To send a request through a proxy IP, remember this Goldilocks parameter:

curl --proxy http://代理IP:端口 -X POST Destination URL

As a real case in point, let's say we use ipipgo's proxy service (their dynamic residential IPs are genuinely solid):

curl --proxy http://z123.ipipgo.com:9021
  -X POST https://api.example.com/data
  -d "keyword=cell phone review"

Third, the actual battle in the tawdry operation

1. timeout setting: Put a safety pin on the request. Disconnect in more than 5 seconds.

--connect-timeout 5

2. Fake Browser: Some websites love to check User-Agent!

-H "User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64)"

3. File Upload: a must for transferring pictures/documents

-F "file=@/home/user/订单表.xlsx"

IV. QA time (demining of frequently asked questions)

Q: Why doesn't the proxy IP take effect after I set it?
A: First check three elements: IP address, port, protocol type. It is recommended to use the test interface provided by ipipgo to verify, their API returns the currently used IP, which is convenient for troubleshooting.

Q: What should I do if my POST request returns 403?
A: Eighty percent of the site is anti-climbing. Try these two strokes: ① change ipipgo's high stash of proxies ② add Referer and Cookie in the request header.

Q: How to go proxy for HTTPS website?
A: Just change the proxy protocol from http to https, for example:

--proxy https://z123.ipipgo.com:9021

V. Proxy IP selection doorway

The market is a mixed bag of agency services, so here's a heads up for newbies:

Like ipipgo's dynamic residential IP pool, measured single IP survival time in 6-24 hours, suitable for the need to frequently switch IP scenarios. Quietly, they have recently newly on the Mexico/Turkey node, do cross-border business old iron can try.

Finally, a nagging word: proxy IP is not a panacea, with a reasonable request frequency and request header settings in order to get twice the result with half the effort. Don't be deadlocked when you encounter difficult problems, timely technical support to find ipipgo, their 7 × 24 online customer service is really able to solve the problem.