curl submit JSON | API interface testing essential commands

Don't let interface testing drag your feet! Hands-on with curl to play with proxy IPs

Do interface testing brothers understand that sometimes the request is dead, eighty percent of the IP is the target site pulled the black. At this time the proxy IP is your lifesaver, today we will use the most popular way to teach you how to use the curl command with the proxy IP to do the test.

Survival rules for curl commands

Let's start by straightening out a few mandatory parameters:
-x parameter to specify a proxy server (don't tell anyone it's a proxy, this is a serious test)
-H parameter to set the request header, especially Content-Type should be set to application/json
-d Arguments directly stuffed json data, note that special characters have to be escaped with backslashes.

curl -x http://user:pass@proxy.ipipgo.com:8080
-H "Content-Type: application/json"
-d '{"username": "test", "password": "123456"}'
http://api.example.com/login

The Three Iron Laws of Proxy IP

Especially recommend the use of ipipgo home proxy, their IP survival time can be customized, do the stress test when you know how worrying. Remember to replace the proxy address in the code with your own account, don't be silly copy and paste ah!

Real-world example: simulating multi-geography requests

Need to test interface response in different regions? Try this script:

for zone in Beijing Shanghai Guangzhou
do
   curl -x http://your_account@proxy-${zone}.ipipgo.com:8899
   -H "X-Auth-Token: your_token"
   -d '{"region":"'${zone}'"}'
   https://your-api-endpoint
done

Use ipipgo's region-specific portal to easily switch between different geographic nodes, and remember to replace your_account with your registered account name.

Common Rollover Scene QA

Q: Why does it return a 407 error?
A: 80% of the authentication information is not transmitted correctly, check the user name password format is not user:pass@ip:port

Q: How to determine whether the proxy IP is effective?
A: Try the request without a proxy, then compare the X-Forwarded-For field in the response header with a proxy

Q: What if I need to change IP frequently?
A: Directly use ipipgo's per-volume billing package, their API supports a random change of IP per request, the document has a detailed sample code

The Ultimate Debugging Secret

Add the -v parameter to see the detailed communication process, and look at these three steps first when you encounter problems:
1. Is the proxy server not connecting (check network and ports)
2. whether the target interface has changed the parameter format (packet capture comparison)
3. whether the proxy IP is blacklisted (try changing ipipgo's high stash of IPs)

Lastly, I would like to say a few words, don't just look at the price when choosing a proxy service. Like ipipgo can provide a complete debugging log, out of the problem can double the efficiency of troubleshooting. Their technical customer service response is also fast, the last time I raised a work order at two o'clock in the middle of the night actually have someone back, this service is really top.