curl view response header: curl proxy view response header

Hands-on teaching you to use curl to check the response header of proxy IPs

Engaged in the development of small partners must often encounter the need to check the server response header. Directly bare access to the target site is easy to expose the real IP not to mention, may also be intercepted by the anti-climbing mechanism. This time the proxy IP will come in handy, today we will use theProxy services for ipipgoto demonstrate how to play around with curl to view response headers.

Why do I need to hook up a proxy to see the response header?

For example, if you want to check whether a CDN has been deployed in a batch, you will be blacklisted in minutes if you directly use your own IP to make crazy requests. If you use a proxy IP:

• Hide the real IP address
• Avoid triggering visit frequency limits
• Simulate the access of users from different regions

 Normal curl to view response headers
curl -I https://example.com

 Using the ipipgo proxy pose
curl -x http://username:password@gateway.ipipgo.com:9023 -I https://example.com

What do I need to know about proxy parameter settings?

Many newcomers planted in the proxy configuration, these pits must be avoided:

Recommended direct copySample code for curl provided by ipipgo backendTheir proxy address is gateway.ipipgo.com and supports multiple protocols. Don't mess around with it yourself, it's easy to match the wrong parameters.

Real-world case studies

Assuming that you want to check the security policy header of a website, with ipipgo's rotating proxy pool you can do this:

for i in {1..5}
do
  curl -x http://user:pass@gateway.ipipgo.com:9023 -I https://target-site.com | grep 'Content-Security-Policy'
  sleep 1
done

This allows for continuous detection with different IPs.ipipgo has an IP survival rate of 99%You don't have to worry about request interruptions. If you find that the response header is missing a security policy, notify the ops guy to harden it.

Common Rollover Scene QA

Q: Proxy setting is successful but I don't see the response header?
A: 80% of them are using redirection, try to add -L parameter to make curl auto jump. Or use ipipgo's session hold function to avoid changing IP in the middle.

Q: What should I do if I return a 407 agent authentication error?
A: Check three elements: 1. username and password right 2. is not used https proxy but with http port 3. account balance is sufficient. ipipgo background real-time usage statistics, you can take a look.

Q: Want to see the request process in more detail?
A: Add the -v parameter to enable detailed mode to see the whole process of proxy handshake. However, be careful not to use it in the production environment, as it may leak authentication information in the logs.

Why do you recommend ipipgo?

Having personally tested more than a dozen proxy service providers, I finally locked ipipgo for three main reasons:

• responsivenessWithin 200msCheck the header information without delay
• Support on-demand customized agent packages, small projects with no physical pain
• There is a special curl configuration document, newbies can also get started in seconds!

Recently, they had aFree 1G traffic for new usersThe activity of the registration can be white whoring. Use it to practice checking the response header is completely enough, we suggest that the guys go to woolgathering to try.

Lastly, although it is convenient to use a proxy to check the response header, you have to be careful not to hang people's websites. Control the frequency of requests and be a civilized data mover.