curl-post option: Example of sending data from the command line

Why do I need a proxy IP to send a POST request?

Folks with curl send data, often encounter the target site to limit the IP situation. To give a chestnut, do data collection when the site found that you frequently request, click on the IP blocked. This time you need to find anegotiatorHelp us to pass the word - that's what proxy IP exists for.

For example, if we want to submit form data to a website, we may be intercepted if we use our own IP directly. Through the proxy IP relay provided by ipipgo, it is like wearing a mask to knock on the door, the site can not recognize our true identity, naturally more secure and stable.

How do I use the -post option of curl?

Remember this universal formula:

curl -X POST -d "parameter1=value1&parameter2=value2" destination URL

Highlight a few common parameters:
– -X POST: Specify the POST method
– -d: followed by the data to be passed
– -H: add request headers (e.g. Content-Type)
– -x: Specify a proxy server (key!)

Real-world: sending data with a proxy IP

Let's say we want to submit our login information through ipipgo's proxy:

curl -x http://user:pass@proxy.ipipgo.io:8080
-X POST
-d "username=test&password=123456"
https://example.com/login

Note a few details here:
1. The proxy address format isUsername:Password@Proxy Address:Port
2. Use ipipgo's proxy to go to the official website to generate authorization information first
3. It is recommended that the password be changed to a dynamic key (which can be generated at any time by the ipipgo back office).

Common Rollover Scene QA

Q: What should I do if I can't connect to the agent?
A: First check whether the proxy address is expired, ipipgo's proxy validity is divided into 1 hour/24 hours/monthly. Then try to access the target website without proxy, to exclude network problems.

Q: What should I do if the POST data is truncated?
A: Try using-data-binaryInstead of the -d parameter, especially when passing files. Remember to add Content-Type to the request header, for example:

-H "Content-Type: application/json"

Q: How can I confirm that the request went through the proxy?
A: In the command add a-vparameter, look at the return message in theConnected to proxy.ipipgo.ioWords.

Tips for using ipipgo

Recommended to use theirIntelligent Switchingfunction, written like this in the curl command:

curl --proxy-anyauth
-x http://动态密钥@smart.ipipgo.io:31000
...

This intelligent proxy pool will automatically switch available nodes, much more stable than fixed IP. The actual test at the same time open 5 tasks, continuous running 12 hours without dropping.

As a final reminder, be careful about sending POST requests with proxies:

Encountered other moths, directly to ipipgo official website to find 24 hours online technical customer service, reported errors in the information screenshot a picture, minutes to give you a whole understanding.