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Как запустить cURL POST с командной строки MacOS

Mac (который не L2)

1 минута чтения

CURL это мощный инструмент командной строки, который позволяет тестировать различные API интерфейсы, отправлять данные на URL методом POST/GET и прочее. Как минимум для разработчика это необходимый инструмент.

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Если вам нужно протестировать CURL, а вы не хотите устанавливать Postman, например, то из терминала (командной строки) на MacOS можно лего инициировать CURL.

В статье мы покажем несколько полезных примеров cURL и терминала.

Отправка POST запрос через cURL

Сделать POST легко: можно с данными, а можно и без них. Смотрите какой синтаксис использования:

CURL запрос без дополнительных данных

CURL запрос с дополнительными параметрами

CURL с передаче полей

CURL с передачей файла

Отправка CURL с JSON

Ловите пример отправки JSON

Вам мало примеров?

Если так, то вы легко можете изучить все возможности CURL в консоли:

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macOS Terminal Download File Command

I often need to download files using the Terminal. However, I am unable to find the wget command on OS X. How do download files from the web via the Mac OS X bash command line option?

You need to use a tool (command) called curl. It is a tool to transfer data from or to a server, using one of the following supported protocols:

Tutorial details
Difficulty level	Easy
Root privileges	No
Requirements	curl
Est. reading time	10m

1. FTP
2. HTTP
3. HTTPS
4. FTPS
5. POP3
6. SFTP
7. SMTPS
8. SMTP and more.

macOS Terminal Download File Command

The following command is designed to work without user interaction.

curl command syntax for downloading files on your macOS

Examples

Open the Terminal and then type the following command to grab “Mastering vim” in pdf format from www.cyberciti.biz server:

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Fig.01: curl command in action

How do I specify multiple URLs or parts of URLs?

You can get sequences of alphanumeric series by using []. In this example, grab invoices-1.pdf, invoices-2.pdf, …, invoices-1000.pdf using curl command:

You can grab urls with leading zeros as follows:

You can combine various techniques to build complex download url structure as follows:

You can set a step counter for the ranges to get every Nth number or letter:

Displaying a progress bar

You can force curl to show progress as a simple progress bar instead of the standard, more informational, meter:

Dealing with url redirection

The following is recommended syntax for servers that may do http redirect before downloading files. Other servers may hide actual download file names.

Consider the following filezilla download url from sourceforge foss hosting platform:

To avoid problems, use the following syntax:

Fig.02: Put the URL in single-quotes and accept url redirection with the -L option

Save bandwidth

You can pass the —compressed option to http based urls to request a compressed response using one of the algorithms curl supports, and save the uncompressed document. If this option is used and the server sends an unsupported encoding, curl will report an error:

Download a file using username and password

Security alert : Anything (username/password) done over HTTP/FTP is completely open to interception. Do not pass username/passwords using ftp/http protocols.

Installing wget on macOS to download files

First, install Homebrew on macOS and then type the following brew command:
brew install wget
Now all you have to do is:
wget url

Summing up

You learned how to download file on macOS using terminal commands such as wget and curl.

Recommended readings

• More – Linux / Unix: curl Command Download File Examples
• Linux / Unix: curl Command Pass Host Headers
• See curl command man page for more information.

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Comments on this entry are closed.

While it is nice to know alternative ways to do tasks without wget on OS X, it is available for OS X.
https://www.macupdate.com/app/mac/33951/wget

If you are already familiar with wget why not install it using mac ports?

And then install wget through it:
Install command: brew install wget

Hey my names Adam,
i would like to know how to download Comand Prompt for mac IOS

I like using also ‘axel’ to download multiple parts from the same file at the same time, increasing the speed 🙂

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curl intro and installation

While Postman is convenient, it’s hard to use it to represent how to make calls with it in your documentation. Additionally, different users probably use different GUI clients, or none at all (preferring the command line instead).

Instead of describing how to make REST calls using a GUI client like Postman, the most conventional method for documenting request syntax is to use curl.

About curl

curl is a command-line utility that lets you execute HTTP requests with different parameters and methods. Instead of going to web resources in a browser’s address bar, you can use the command line to get these same resources, retrieved as text.

Sometimes curl is written as cURL. It stands for Client URL. “curl” is the more common convention for its spelling, but both refer to the same thing.

Installing curl

curl is usually available by default on Macs but requires some installation on Windows. Follow these instructions for installing curl:

Install curl on Mac

If you have a Mac, by default, curl is probably already installed. To check:

Open Terminal (press Cmd + spacebar to open Stoplight, and then type “Terminal”).

In Terminal type curl -V . The response should look something like this:

If you don’t see this, you need to download and install curl.

Install curl on Windows

Installing curl on Windows involves a few more steps. First, determine whether you have 32-bit or 64-bit Windows by right-clicking Computer and selecting Properties. Then follow the instructions in this Confused by Code page. Most likely, you’ll want to choose the With Administrator Privileges (free) installer.

After you install curl, test your version of curl by doing the following:

1. Open a command prompt by clicking the Start button and typing cmd.
2. Type curl -V .

The response should be as follows:

Make a test API call

After you have curl installed, make a test API call:

(In the above code, replace APIKEY with your actual API key.)

You should get minified JSON response back like this:

In Windows, Ctrl+ V doesn’t work; instead, you right-click and then select Paste.

Notes about using curl with Windows

If you’re using Windows, note the following formatting requirements when using curl:

• Use double quotes in the Windows command line. (Windows doesn’t support single quotes.)
• Don’t use backslashes ( \ ) to separate lines. (This is for readability only and doesn’t affect the call on Macs.)
• By adding -k in the curl command, you can bypass curl’s security certificate, which may or may not be necessary.

16/163 pages complete. Only 147 more pages to go.

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Mac Terminal Curl for textfile

I am trying to download a CSV file from a local webserver (the webserver runs on a signal conditioning instrument) with:

The output from curl is only weird symbols. If I put the same url in Safari the CSV File is correctly depicted. Is there any encoding problem with curl?

I tried the verbose option which gives:

Source Code of the webpage (Google Chrome) is a plain cdv file. CSV File is create by http://www.vega.com/en/Signal-conditioning-instrument-VEGAMET391.htm

The —text-ascii option also did not help!

3 Answers 3

It seems the page is sent back compressed (see the header «Content-Encoding: gzip») even though curl didn’t ask for it. If you ask for it, curl will decompress it for you automatically when receiving it. Try:

That command should work, it works correctly on my system (10.6) when serving a csv file locally.

You could try the command with verbose on to see if there is any issue:

How was the CSV created? By Excel or was it always native text? I suspect Safari is rendering while ignoring extraneous binary data.

You could View Source in Safari and make sure it is plain.

Also try curl —trace-ascii to request ASCII context.

Edit: From your verbose output, it looks like the file is gzipped. Try saving it as a .gz file instead and then gunzip crv01.gz

If there are more crv files, you can also download a range of them at once:

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Using cURL with HTTP/2 on Mac OS X

cURL is one of the most powerful tool for testing HTTP requests and responses. Most developers use curl to interact with HTTP APIs or to test a website.

Starting from version 7.43.0 cURL (and libcurl ) supports HTTP/2. You can perform a request using the HTTP/2 protocol passing the —http2 flag:

However, in order to support HTTP/2, cURL must be linked to nghttp and the default cURL version shipped with Mac OS X does not. As a result, if you try to pass the —http2 flag you’ll receive the following error:

To solve the issue and use cURL with HTTP/2 in Mac OS X your need to recompile cURL. This is a very easy task if you use Homebrew. Thanks to this PR you can reinstall cURL via Homebrew and pass the —with-nghttp2 flag to add the HTTP/2 support along with the necessary dependencies.

Almost done. By default, Homebrew will not replace the curl binary shipped with Mac OS X, therefore you need to explicitly «link» it if you want to use the new version without specifying the entire path to the binary (which by the way is /usr/local/Cellar/curl/7.46.0/bin/curl ):

Close/reopen the shell and the curl location should now be:

You can also confirm the version and the custom flag using the command brew info curl :

If it’s still /usr/bin/curl then make sure cURL was properly installed via Homebrew and you restarted your shell.

Instructions

To recap, here’s the list of commands to compile and install cURL with HTTP/2 support in Mac OS X using Homebrew:

A special thanks to Daniel Stenberg for cURL, and to @felixbuenemann for the Homebrew patch that made it possible to install cURL with HTTP/2 with zero effort.

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