curlPOST Request Example: JSON/Form Submission Example

Hands-on teaching you to send POST requests using proxy IPs

We engage in crawling or interface docking time, often encountered site anti-climbing or request frequency limitations, right? This is the time to ask the proxy IP this magic weapon. Today we take our family ipipgo proxy service as a chestnut, teach you how to use curl to send JSON and form POST request, along with a few common problems.

First, why do you have to be on a proxy IP?

Let's take a real-life scenario: a script you've written is suddenly being used by the target siteIP blockingIf you have ipipgo's proxy pool on hand at this time, you can directly change an IP to revive your blood. Their dynamic residential proxy is particularly suitable for high-frequency requests, a single session automatically switching IP, do not give each other the opportunity to ban.

 Basic proxy settings (all requests go through the proxy)
export http_proxy=http://用户名:密码@gateway.ipipgo.com:端口
export https_proxy=http://用户名:密码@gateway.ipipgo.com:端口

JSON request operation

Now many APIs require JSON data, here's a tip: remember to put theContent-TypeSet it up right or the server may not recognize it. With the ipipgo proxy, it is recommended to use their first in the testing phasetrial packageTo avoid wasting resources.

curl -X POST
  -H "Content-Type: application/json"
  -d '{"username": "test_user", "action": "query"}'
  --proxy http://user123:pass456@proxy.ipipgo.com:9020
  https://api.example.com/v1/data

Third, the form to submit special skills

Old-fashioned websites still prefer to use form submissions, and the easiest pitfall to step into here is theparameter codingThe first thing you need to do is to check the regional settings of your node. When using ipipgo's proxy, if you encounter garbled code, remember to check their node region settings, sometimes change a domestic node will be normal.

curl -X POST
  -d "user=Xiaoming&age=28&city=Beijing"
  --proxy http://user123:pass456@proxy.ipipgo.com:9020
  https://oldwebsite.com/submit

iv. guide to demining common problems

Q: Proxy setting is successful but the request is not responding?
A: First use curl -v parameter to see the detailed logs, check whether the proxy address is wrong. ipipgo address format should pay attention to with port number, their customer service can real-time check the available ports.

Q：How to solve the problem of returning 403 error?
A: The probability is that the IP is recognized as a proxy, change to ipipgo'sDynamic Residential IPPackages, this IP is just as effective as home broadband, and it works in person.

Q: How do I bulk test agent availability?
A: ipipgo backend has ready-made API debugging tools, try their test interface and your target address, much faster than manual testing.

V. The doorway to selecting agency services

There are a variety of agency services on the market, so focus on three things:
1. Connection speed (ipipgo average response <200ms)
2. IP purity (their own residential IP pool)
3. Post-sales response (24/7 work order support)

One last hidden trick: use ipipgo'ssession hold functionTo do operations that require login, the same IP is maintained for 30 minutes without changing, a perfect solution to scenarios that require login state.