Proxy IP to get cURL response header: cURL uses proxy IP to get header

Hands-on with cURL to grab site header information

As all developers know, sometimes you want to see what kind of tricks the web server is hiding, and it's most direct to use cURL to check the response header. But directly with their own IP to dislike, may be blacklisted by the site. This time you need a proxy IP as a "stand-in actor", not only to protect themselves, but also stable access to data.

Why do I have to use a proxy IP?

To give a chestnut, just like you go to the supermarket to try to eat, if you catch the same counter even eat 20 times, the clerk must roll their eyes. Similarly, the site found that a certain IP frequently request header information, light flow restriction, heavy blocking. If you use ipipgo's proxy IP pool, you can easily bypass these restrictions by changing your IP to a different one for each request.

curl -x http://username:password@proxy.ipipgo.cc:8080 -I https://example.com

Four Steps to Real-World Configuration

Step one:To ipipgo official website to get a proxy package, the newbie is recommended to choose to pay by the amount, how much to use how much not waste!

Step two:Remember these three elements: proxy address, port, account password. Note that the http and socks5 protocols do not get confused, ipipgo background has detailed documentation!

Step Three:Splicing parameters on the command line, the -x parameter is followed by the proxy information, and the -I parameter means just the header information

Step Four:After running the command to see the return HTTP status code, 200 is successful, 403/429 indicates the need to change the proxy IP

lit. look inside the response header to see the doorway (idiom); fig. understand the meaning of a word or phrase

Treadmill Guide QA

Q: What should I do if I can't connect to the proxy IP?
A: First check whether the network can ping through the proxy server, and then confirm that the account password has not lost the wrong. ipipgo background has a "connection test" function, it is recommended that you use this test first!

Q：What is the situation of returning 502 Bad Gateway?
A: Eighty percent of the proxy server to pump the wind, change a ipipgo node to try. Their nodes have a survival rate of 99%, so changing a few more will work.

Q: What if I want to get header information in bulk?
A: Write a shell script to call cURL cyclically, and remember to change the proxy IP of ipipgo before each request. their API supports on-demand IP extraction, and automatic switching is not too convenient!

Choosing the right agent is important

Proxy services on the market are mixed, some free agents look at the money, the actual use of high latency, instability. ipipgo exclusive proxy line, the measured response speed can be controlled within 200ms, but also support the geographical selection of nodes. Especially their intelligent routing function, automatic selection of the optimal line, than manual switching to save a lot of trouble.

Lastly, I would like to remind you to pay attention to the frequency control when you use cCMD to check the header information. Even if you use a proxy IP, don't glean to death, set a -max-time parameter to limit the timeout time, do people leave a line in the future good to see you.