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How to use curl custom HTTP header in Linux system. For this problem, this article introduces the corresponding analysis and solution in detail, hoping to help more partners who want to solve this problem to find a more simple and easy way.

Curl is a powerful command-line tool that can pass information to or retrieve data from a server over the network. He supports many transport protocols, especially HTTP/HTTPS and other protocols such as FTP/FTPS, RTSP, POP3/POP3S, SCP, IMAP/IMAPS and so on. When you use curl to send a HTTP request to a URL, it uses a HTTP header that contains only the necessary header fields (such as User-Agent, Host, and Accept) by default.

In some cases, you may want to override the default HTTP header or add a new custom header field in a HTTP request. For example, you may want to rewrite the "HOST" field to test a load balancer, or by rewriting the "User-Agent" string to impersonate a specific browser to solve some access restrictions.

To solve all these problems, curl provides a simple way to fully control the HTTP headers of outgoing HTTP requests. The parameter you need is "- H" or "--header".

To define multiple HTTP header fields, the "- H" option can be specified multiple times in the curl command.

For example: the following command sets three HTTP header fields. That is, the "HOST" field is rewritten and two fields ("Accept-Language" and "Cookie") are added

The code is as follows:

$curl-H'Host: 157.166.226.25'-H 'Accept-Language: es'-H'Cookie: ID=1234' http://cnn.com

For standard HTTP header fields such as "User-Agent", "Cookie" and "Host", there is usually another way to set them. The curl command provides specific options to set these header fields:

-A (or-- user-agent): set the "User-Agent" field.

-b (or-- cookie): set the "Cookie" field.

-e (or-- referer): set the "Referer" field.

For example, the following two commands are equivalent. Both commands also make changes to the "User-Agent" string in the HTTP header.

The code is as follows:

$curl-H "User-Agent: my browser" http://cnn.com

$curl-A "my browser" http://cnn.com

Wget is another command-line tool similar to curl that can be used to get URL. And wget also allows you to use a custom HTTP header. Click here to view the details of the wget command.

This is the answer to the question about how to use the curl custom HTTP header in the Linux system. I hope the above content can be of some help to everyone. If you still have a lot of doubts to be solved, you can follow the industry information channel to learn more about it.

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