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Tutorials

HOW TO USE CURL WITH REST API

Yelyzaveta Nechytailo

2023-05-164 min read
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cURL, also known as Client URL, is a command line utility. This CLI tool
facilitates data exchange between a device and a server through a terminal. By
using cURL, you can make network requests and send or receive data directly from
the command prompt without needing a GUI.

cURL also has various options which enable users to add custom headers, specify
timeouts and authentication details, etc. The simplicity of using cURL from the
command line attracts a lot of developers to use it as their go-to tool for
testing APIs and microservices. Additionally, its support for the HTTP protocol
makes it convenient for testing REST APIs.

In this tutorial, you’ll learn how to interact with the REST API using cURL.
You’ll also see how to set up and use a proxy with cURL. Let's get started.

TUTORIAL: USING CURL WITH APIS

In this section, you’ll explore various cURLs commands by interacting with the
REST API. If interested, you can also check our cURL converter tool to transform
cURL commands into your preferred programming languages. You’ll also learn how
to utilize Oxylabs’ Web Unblocker with cURL. It’s an AI-powered proxy solution
that enables you to send network requests without exposing your IP address and
other personal tracking information.

1. PREPARING THE ENVIRONMENT

First, install cURL if you don’t have it already. You can install it with the
following command in Linux:

apt install curl

If you’re using a different operating system, you can download and install the
latest version from the official website. Once you’ve installed cURL, try
running the below command in your terminal:

curl --version

The above command shows the version, release date, supported protocols, and
features of your cURL executable.

2. CREATE AN OXYLABS ACCOUNT

To get started, take advantage of the 1-week free trial. It’ll give you
sufficient time to explore various Web Unblocker features and ensure it meets
your needs. If you decide to continue using Web Unblocker after the trial
period, you can easily upgrade to a preferred plan without any interruptions in
your service.

Upon selecting your preferred plan, you’ll receive sub-user credentials that’ll
enable you to send network requests through the proxy.

3. SET UP WEB UNBLOCKER

Set Web Unblocker as a proxy using the -x flag of cURL. The proxy address should
be unblock.oxylabs.io and the port 60000. It also requires the “ignore SSL
certificate” flag to work properly, which is --ignore or the short form -k.
Lastly, you’ll also have to pass the sub-user credentials that you’ve got in the
previous step. Use the -U flag to pass user credentials. It’ll look similar to
this:

curl -k -x unblock.oxylabs.io:60000 -U "USERNAME:PASSWORD" "WEBSITE_URL"

Note that you’ll have to replace the USERNAME, and PASSWORD with the appropriate
credentials to make it work.

4. SEND A GET REQUEST TO THE API

Next, you’ll have to replace WEBSITE_URL with the API url. Let’s use the
ip.oxylabs.io/location API for now. You can replace it with the REST API of your
preference if you want. So, the command will be:

curl -k -x unblock.oxylabs.io:60000 -U "USERNAME:PASSWORD" "https://ip.oxylabs.io/location"

If you run this command, it’ll send a GET request to the url and retrieve the
response. The website https://ip.oxylabs.io/location shows the IP address of the
user’s device. Web Unblocker automatically rotates proxy IP addresses for you.
If everything is working properly, you should see a different IP address than
that of your device’s. If you run the command again, you’ll see another IP
address different from the previous one. We've delved deeper into sending GET
requests with cURL on another post, so feel free to check it out.

You can also create a unique session id by passing a special header
X-Oxylabs-Session-Id with your requests. This will make sure the proxy IP
address remains the same for multiple network requests sent through the session
id:

curl -k -x unblock.oxylabs.io:60000 -U "USERNAME:PASSWORD" -H "X-Oxylabs-Session-Id: session-1" https://ip.oxylabs.io/location

Notice the flag for setting a custom header is -H. You can also change the
string session-1 to something else; it'll work as long as the string is valid
and always remains the same.

Web Unblocker has some more features such as Javascript rendering, custom
cookies, headers, and geo-location. Check out the documentation to learn more.

5. SEND A POST REQUEST TO THE API

To send a POST request using cURL, you’ll have to set a new flag --request to
POST. Along with this flag, you’ll also have to pass another flag --data with
the data that you want to post to the API:

curl -k -x unblock.oxylabs.io:60000 -U "USERNAME:PASSWORD" --request POST --data '{"name": "John"}' https://ip.oxylabs.io/location

As you can see, we’re passing a JSON object containing a single field named name
with a value of John. If the API supports multiple fields, you can pass them all
together in a single JSON object. For example:

curl -k -x unblock.oxylabs.io:60000 -U "USERNAME:PASSWORD" --request POST --data '{"name": "John Doe", "email": "jd@example.com"}' https://example.com/api/post

Here, you’re passing two fields name and email.

6. SEND A PUT REQUEST TO THE API

Similarly, you can use cURL to send a PUT request to an API. The PUT method is
used for updating data. You’ll have to change the argument of the --request flag
to PUT. Let’s say you want to update the email address of the previous example
and replace jd@example.com with johndoe@example.com. Then, the command will
become:

curl -k -x unblock.oxylabs.io:60000 -U "USERNAME:PASSWORD" --request PUT --data '{"name": "John Doe", "email": "johndoe@example.com"}' https://example.com/api/update

Once you run the above command, cURL will use a proxy to send a PUT request to
the API. After receiving the PUT request, the API will update the email address
of the entry with the name John Doe.

7. SEND A DELETE REQUEST TO THE API

cURL also supports the DELETE request of the HTTP protocol. This can be set with
the flag --request DELETE. Let’s remove the previous entry by running the
following command:

curl -k -x unblock.oxylabs.io:60000 -U "USERNAME:PASSWORD" --request DELETE --data '{"name": "John Doe", "email": "johndoe@example.com"}' https://example.com/api/remove

This will remove the entry with the name John Doe.

CURL ALTERNATIVES

There are multiple alternatives to cURL that offer similar functionality and
capabilities. One of them is Postman, a popular API testing tool that offers a
comprehensive graphical interface for testing and debugging APIs. And if you’re
familiar with programming, then Python scripts can also be useful to test APIs.
Alternatively, cURL can be run in Python itself by utilizing the PycURL library.

If you’re looking for a command line alternative, then you might find HTTPie and
Wget helpful. They both are robust and powerful and have all the necessary
features to test or interact with REST APIs.

CONCLUSION

Establishing a well-defined development process that includes thorough testing
is crucial for maintaining the quality and reliability of microservices and REST
APIs. Tools like cURL are essential for supporting this process by providing an
efficient way to test various scenarios and analyze responses. These tools can
significantly improve the development process, ensuring the system's reliability
and quality.

By combining cURL with Web Unblocker, you can send network requests in bulk
without leaving any trace of the tracking information on your device.

FREQUENTLY ASKED QUESTIONS

WHAT IS CURL USED FOR?

cURL is commonly used for testing APIs and microservices during the development
process. cURL provides a simple and efficient way to send HTTP requests and view
the responses, allowing developers to debug issues, test different scenarios,
and optimize the performance of their APIs and microservices.

HOW TO CHECK THE API USING CURL?

cURL supports around 22 protocols including HTTP. Also, cURL has all the
necessary command options to send GET, POST, PUT, and DELETE requests to a REST
API. You can take advantage of all these options to check the API. The below
command checks the status of Github REST API and shows the output on the
terminal.

curl "https://api.github.com/status"

WHAT IS THE DIFFERENCE BETWEEN CURL AND REST API?

cURL is a command line tool without any graphical user interface, on the other
hand, REST API is an application programming interface deployed on a server or a
device. cURL can make network requests and receive responses, and REST API can
receive network requests and respond accordingly. If you’re developing a REST
API, you can utilize cURL as a testing tool for REST API.

About the author

Yelyzaveta Nechytailo

Senior Content Manager

Yelyzaveta Nechytailo is a Senior Content Manager at Oxylabs. After working as a
writer in fashion, e-commerce, and media, she decided to switch her career path
and immerse in the fascinating world of tech. And believe it or not, she
absolutely loves it! On weekends, you’ll probably find Yelyzaveta enjoying a cup
of matcha at a cozy coffee shop, scrolling through social media, or
binge-watching investigative TV series.

Learn more about Yelyzaveta Nechytailo

All information on Oxylabs Blog is provided on an "as is" basis and for
informational purposes only. We make no representation and disclaim all
liability with respect to your use of any information contained on Oxylabs Blog
or any third-party websites that may be linked therein. Before engaging in
scraping activities of any kind you should consult your legal advisors and
carefully read the particular website's terms of service or receive a scraping
license.

Tutorials

HOW TO SEND POST REQUESTS WITH CURL

cURL is a lightweight yet powerful tool for sending POST requests from CLI. Read
this tutorial for detailed instructions on sending POST requests with cURL.

Yelyzaveta Nechytailo

2023-06-09

TutorialsData acquisition

HOW TO SEND GET REQUESTS WITH CURL

Read this article to learn sending simple cURL GET requests or with parameters
effortlessly. Find out how to retrieve JSON data and the main request arguments.

Iveta Vistorskyte

2023-06-09

Data acquisitionTutorials

HOW TO SEND HTTP HEADERS WITH CURL

This guide covers various aspects of sending and receiving HTTP headers using
cURL. The content discloses tips for use cases and discusses troubleshooting
cURL header issues.

Augustas Pelakauskas

2023-05-25

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IN THIS ARTICLE:

* Tutorial: Using cURL with APIs
* cURL alternatives
* Conclusion

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