cURL POST request body: Example of sending form/JSON data from the command line

Hands-on with Proxy IP to send POST requests

Brothers engaged in development must have encountered this scenario: to batch test interfaces or collect data, the results of the IP is blocked by the target site to death. At this time, you have to use proxy IP torotational identityToday, we will take cURL as a command-line artifact to practice, teach you how to send forms and JSON data with proxy IP.

Get ready for your stuff.

First, make sure you have the latest version of cURL installed on your computer (version 7.18.0 or above), open the terminal and type incurl -versionJust look at the version number. Then go toipipgo official websiteGet a couple of dynamic residential proxies, they have a large pool of proxies and a simple authentication method, which is especially good for this scenario where you need to switch IPs frequently.

Real-world form submission

Suppose you want to submit product reviews to an e-commerce platform in bulk, and use ipipgo's proxy server to relay the requests. The command looks like this:

curl -x http://user:pass@proxy.ipipgo.com:8080
-d "product_id=12345&rating=5&comment=well used"
-X POST https://example.com/api/review

Pay attention here.-x parameterSpecify the proxy server, ipipgo authentication information directly in the address. If you encounter a connection timeout, you can add a-connect-timeout 30parameter to stretch the timeout a bit.

JSON Data Delivery

Many APIs are now switching to JSON to pass data, for example to do user registration automation:

curl -x http://user:pass@proxy.ipipgo.com:8080
-H "Content-Type: application/json"
-d '{"username": "test_user", "email": "test@ipipgo.com"}'
-X POST https://example.com/api/signup

There are two potholes to watch out for here:
1. JSON data must be wrapped in single quotes
2. The request header must specify the Content-Type
With ipipgo.Long-term agency packagesIt can save you the hassle of changing agents frequently, and their session hold feature does a solid job.

Frequently asked questions on demining

Q: Does proxy IP affect the request speed?
A: It's important to pick the right type of proxy, ipipgo'sDynamic Residential AgentsLatency is generally within 200ms, which is perfectly adequate for data collection

Q: How do I know if the proxy is active?
A: First request httpbin.org/ip without proxy, then request it again with proxy to compare whether the two IP addresses are different or not

Q: Do I need special settings for HTTPS requests?
A: ipipgo's proxy supports HTTPS tunneling mode by default, directly configured according to the HTTP proxy on the line, without additional effort!

Lastly, I'd like to remind you to remember to add random delays to your code when batch operating with ipipgo'sIntelligent switching strategyIt can automatically match the optimal line. Don't panic when you get a 403 error, check if the User-Agent in the request header is too fake, and use a real browser UA to significantly reduce the risk of being broken.