curl POST Request Example: Form Submission Example

Hands on teaching you to send POST forms using proxy IPs

When you are doing data collection or interface testing, you often encounter situations where the target website limits the frequency of requests. This time you need to use the proxy IP to disperse the pressure of the request, today we take the most commonly used curl command to demonstrate how to send a POST form with a proxy IP.

First of all, why do we need to use a proxy IP, for example, you continuously use the same IP to send a request to the site, just like in the supermarket checkout line by the security guards, minutes to pull you blacklisted. With ipipgo's proxy pool, it's equivalent to changing your face every time you stand in line, so the security guards won't recognize you at all.

Naked version of curl POST request

Look at the basic operation of not using proxies first, so that adding proxies later is understandable:

curl -X POST
  -d "username=testuser"
  -d "password=Test1234"
  https://example.com/login

This command throws two parameters into the login interface, the -d parameter is the form field. However, it is easy to be blocked by the IP address, so let's put a "vest" on it.

Putting a proxy vest on curl

Here's the kicker! To add a proxy to curl, remember these two key parameters:

A real example using ipipgo's proxy service:

curl -x http://proxy.ipipgo.com:8000
  --proxy-user vipuser:9A8sdp2!
  -X POST
  -d "keyword=cellphone"
  -d "page=1"
  https://item-search.com/products

Here are a few points that are easy to plant:

1. Port number in the proxy addressDon't miss it.The ports for ipipgo are available on the console.
2. The special symbols in the account password should be wrapped in English quotes, otherwise the command line will report an error
3. It is recommended to run through the test environment first, and then on the production environment

Practical anti-blocking techniques three companies

It's not enough to know how to use an agent, share a few life-saving tricks:

1. IP Rotation StrategyDon't use a single IP, ipipgo's API can get new IPs in real time!
2. Stochastic dormancy mechanism: Add a sleep to the script to mimic a real person's intervals.
3. request header masquerading as: Remember to include the User-Agent, don't use the curl defaults!

curl -x http://dynamic.ipipgo.com:8021
  --proxy-user vipuser:9A8sdp2!
  -H "User-Agent: Mozilla/5.0 (Windows NT 10.0)..."
  -X POST
  -d "city=Shanghai"
  https://weather-api.com/data

Guidelines on demining of common problems

Q: The proxy IP is configured correctly but the request fails?

• Check if the proxy service is valid
• Try configuring the proxy with your browser first to see if it works
• Contact ipipgo customer service for the latest access documentation

Q: POST request returns 405 error?

• Confirm that the destination address supports the POST method
• Check that the GET parameter format is not being used by mistake
• Remove the proxy to test if the direct connection works

Q: How is the ipipgo proxy pool maintained?

• The system automatically rejects failed nodes
• IP pool updated every 5 minutes
• Supports IP filtering by region/carrier

Choosing an agency service depends on the doorway

The market is a mixed bag of proxy services, ipipgo can dothree highs and three lows::

Finally, we remind you that data collection should comply with the robots agreement of the website and reasonably control the frequency of requests. Use a good proxy IP this tool, not only can enhance the efficiency of work, but also to avoid the burden on the target site, which is a win-win situation of the proper use.