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This article will explain in detail how to use curl in linux. The editor thinks it is very practical, so I share it with you as a reference. I hope you can get something after reading this article.

What is curl?

Curl is a command-line tool for constructing HTTP requests. I like to use curl because it can easily test whether the server or API behaves as expected, but it can confuse you when you first come into contact with it!

Here is a cartoon that explains the common command-line parameters of curl (on page 6 of my Bite Size Networking magazine).

Practice makes perfect

I think it's helpful to be proficient in using any command-line tool, and it's great to be able to enter only the necessary commands. For example, I've been testing Gumroad API recently, and I just need to type:

Curl https://api.gumroad.com/v2/sales\-d "access_token="\-X GET-d "before=2016-09-03"

You can get the desired results from the command line.

21 curl exercises

These exercises are used to understand how to use curl to construct different kinds of HTTP requests, they are deliberately a little repetitive, and basically include everything I need curl to do.

For simplicity, we will make a series of HTTP requests to https://httpbin.org. Httpbin accepts HTTP requests, and then echoes your HTTP requests in the response.

Request https://httpbin.org

Request https://httpbin.org/anything, which will parse your request and echo it in the response. Curl initiates a GET request by default

Initiate a GET request to https://httpbin.org/anything

Initiate a GET request to https://httpbin.org/anything, but this time you need to add some query parameters (set value=panda)

Request the robots.txt file (www.google.com/robots.txt) of Google

Initiate a GET request to https://httpbin.org/anything and set the request header to User-Agent: elephant

Initiate a DELETE request to https://httpbin.org/anything

Request https://httpbin.org/anything and get response header information

Initiate a POST request to https://httpbin.com/anything with the request body JSON {"value": "panda"}

Initiate the same POST request as the previous one, but this time set the Content-Type field in the request header to application/json (because the POST request requires a Content-Type request header field that matches the request body). Check the json field in the response body and compare the response body obtained last time

Make an GET request to https://httpbin.org/anything and set Accept-Encoding: gzip in the request header (what will happen? Why is this? )

Put some JSON in the file, and then make a POST request to https://httpbin.org/anything for the file.

Set the request header to Accept: image/png and initiate a request to https://httpbin.org/image, save the output as a PNG file, and then open it using a picture browser. Try to request this URL using a different Accept: field

Initiate a PUT request to https://httpbin.org/anything

Request https://httpbin.org/image/jpeg and save it as a file, then use your picture editor to open the file

Request https://www.twitter.com and you will get an empty response. Let curl display the response header information and try to find out why the response content is empty

Make any request to https://httpbin.org/anything and set some meaningless request headers (for example: panda: elephant)

Request https://httpbin.org/status/404 and https://httpbin.org/status/200, then request them again and have curl display the response header information

Request https://httpbin.org/anything and set user name and password (using-u username:password)

Set the request header of Accept-Language: es-ES to download Twitter's Spanish homepage (https://twitter.com))

Use curl to make a request to Stripe API (see https://stripe.com/docs/development for how to use it, and they will give you an API key for testing). Try to make the same request to https://httpbin.org/anything

This is the end of the article on "how to use curl in linux". I hope the above content can be of some help to you, so that you can learn more knowledge. if you think the article is good, please share it for more people to see.

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