Curl command example.
I have a server application written in ASP.
Curl command example May 19, 2024 · In this tutorial, we have discussed the most common examples of curl commands in Linux. Naturally, you might want to use cURL in your PowerShell scripts as well. Dec 3, 2024 · In this beginner curl tutorial, I‘ll go over: What curl is and why it‘s useful Making GET and POST requests Passing data and headers Debugging and timing requests Common use cases for curl And more curl tips for beginners! Follow along with plenty of examples to make your first curl calls. It was designed for interactive text-oriented communications and there is no encrypted or secure version of Telnet. Below are some of the most commonly used options. This Sep 7, 2023 · This page contains a comprehensive curl command-line reference and guide based on the Mastering the Curl Command Line master class as well additional usage notes and examples on using curl. Curl is a command-line utility for transferring data from or to a remote server. It works with various protocols, but it’s most commonly used with HTTP and HTTPS. Understand differences between cURL and Invoke-WebRequest, remove aliases, and see common command examples with JSON and POST requests. cURL is a very useful command line tool used to transfer data from or to a server. The tool is commonly used in scripting or to automate tasks. It supports various types of protocols. Jun 7, 2022 · As an example, using basic auth to authenticate with curl, run the following command: curl --user username:password https://example. The curl command can handle a wide range Aug 14, 2023 · Learn how to use the Linux curl command and its most commonly used options. Nov 22, 2021 · A curl command is a tool used to transfer data between different hosts. Essentially, Curl prints the web response to the terminal. (dot, period, full stop) might mean in computer science: Dot is a placeholder for the current directory in Unix File Systems; Jul 12, 2019 · Tutorial on Linux curl command with practical examples. One of the most versatile and powerful tools for this purpose is cURL. Oct 21, 2016 · We’ll show you 5 basic cURL command examples, and explain them in detail. The simplest form of a cURL command is: curl [options] [URL] Dec 3, 2023 · How to send a POST request using Curl? You can send a POST request with Curl by explicitly specifying the POST method with the -X POST command line parameter or passing data to Curl using the -d or --data command line parameter. But if you’re new to it: curl (short for “Client URL”) is a lightweight yet powerful command-line tool for transferring data across URLs. Download a Single File The following command I have a server application written in ASP. If you’d like to find out more about cURL Aug 13, 2024 · The curl command is a powerful and versatile tool used to transfer data to or from a server using various protocols, such as HTTP, HTTPS, FTP, and more. This is handy if you want to send data to API endpoints encoded as regular text. If you want both Apple SecTrust and your own file to be considered, use: Nov 4, 2024 · cURL, short for Client URL, is a command-line tool that allows you to transfer data to or from a server. Getting Started with curl Installing curl Most Linux distributions come with curl pre-installed. I have a URL to which I Nov 22, 2025 · How to Send GET Requests With cURL – Full Guide With Examples cURL is a lightweight command-line tool and “client url” that lets you run HTTP commands from any terminal. Dec 28, 2023 · This article explains how to use curl to make POST requests. curl then commands the server to connect back to the client's specified address and port, while passive mode asks the server to setup an IP address and port for it to connect to. Perhaps you could force it with the curl parameter --cacert file or --cert. ) Explicitly sending the output to stdout seems a bit redundant, since that's the default anyway. Learn how to view the HTTP response of a website, download or transfer a file. For example, curl -L ip. cURL supports various protocols like, DICT, FILE, FTP, FTPS, Gopher, HTTP, HTTPS, IMAP, IMAPS, LDAP, LDAPS, POP3, POP3S, RTMP, RTSP, SCP, SFTP, SMTP, SMTPS, Telnet and TFTP. Oct 21, 2022 · Curl (client URL) is a command-line tool powered by the libcurl library to transfer data to and from the server using various protocols, such as HTTP, HTTPS, FTP, FTPS, IMAP, IMAPS, POP3, POP3S, SMTP, and SMTPS. curl supports sending data to an SMTP server, which combined with the right set of command line options makes an email get sent to a set of receivers of your choice. Learn how to use curl and its options. Apr 25, 2025 · The Linux cURL command lets you transfer data with systems. For example: The above command does a POST request to the “/post_endpoint” endpoint while passing the data "key1=value1&key2=value2". Jul 23, 2025 · One can send the post data using curl (Client for URLs), a command line tool, and a library for transferring data with URLs. Learn common HTTP request patterns for GET, POST, PUT, DELETE with authentication. Here's the syntax of curl command with examples. curl is a command line tool used to transfer data to and from a server. The protocol is not done to handle plain uploads or downloads so the usual curl paradigms have had to be stretched somewhat to make curl deal with As in: curl https://example. Mar 31, 2024 · The curl command in Linux stands for “ C lient URL ”. This in-depth guide will teach you how to fully utilize curl with examples of common use cases. pem. Discover the versatility of Curl for port-related tasks. What it does depends on the server logic and is out of the curl command scope. . The response bodies are printed to standard out, which is fine, but I can't see from the man page how to get curl to print the Dec 6, 2022 · The link I gave was for curl, so it's supposed to work. Jul 23, 2025 · Curl is a command-line tool for making web requests, often used directly from the terminal. Let’s explore 20 essential tips that will help you become proficient with cURL. com In this situation, Apple SecTrust is not used and verification is done only with the trust anchors found in mycerts. Dec 16, 2024 · Explore 20 essential curl commands for developers and sysadmins. Curl commands work without user interaction and are therefore ideal for use in automation scenarios. Check out this article to learn more about its usage and its real-world examples. Curl runs on 92 operating systems and has over 20 billion installations worldwide. 8 Fetch a Web Page In its most basic form, curl fetches a URL and displays its contents on your terminal: curl info. Learn about its limitations and alternatives for viewing full HTTP requests. In this article, we will learn how to make REST API requests using Curl. <address> should be one of: Explore the versatile curl command in Linux, learn how to fetch web page content, download files, and more through practical examples. Jun 20, 2025 · Learn how to use PowerShell curl commands with our tutorial covering Invoke-WebRequest, Invoke-RestMethod, aliases, authentication, and real-world examples. Basically, I need to test connectivity over https from one machine to another machine. Most of the use cases of the curl command are posting JSON data to a server endpoint. 2. character as ASCII data to the server. Sep 13, 2023 · To post a simple key-value form data to the server, use the -d option and pass the data string to send. ba3a. In this guide, I use Ubuntu and installed cURL on it. It is highly popular for automation and scripts due to its wide range of features and protocol support. TELNET Telnet is an ancient application protocol for bidirectional clear-text communication. The most common uses of the curl command include file downloading, uploading, troubleshooting, etc. cURL supports various protocols, such as FILE, HTTP, HTTPS, IMAP, IMAPS, LDAP, DICT, LDAPS, TELNET, FTP, FTPS, GOPHER, RTMP, RTSP, SCP, SFTP, POP3, POP3S, SMB, SMBS, SMTP, SMTPS, and TFTP. Mar 24, 2021 · Send a JSON string to the server. TELNET is not a perfect match for curl. com You may still provide your own certificates on the command line, such as: curl --cacert mycerts. com Where --user is followed by the username and password (colon delimited) with basic auth being the default, then followed by the URL you are sending the authenticated request to. It is a versatile utility with a wide range of applications, making it a valuable asset for developers, system administrators, and anyone who needs to interact with web servers. The most common way developers use it is with a curl get command, a powerful tool for retrieving data from web servers over HTTP and other protocols. Nov 20, 2025 · the json format requires a bunch of extra quoting curl will send form urlencoded by default, so for json the Content-Type header must be explicitly set This gist provides examples for using both formats, including how to use sample data files in either format with your curl requests. In this tutorial we Sep 4, 2023 · Curl by example: Interactive guide Curl (c lient for URL s) is a tool for client-side internet transfers (uploads and downloads) using a specific protocol (such as HTTP, FTP or IMAP), where the endpoint is identified by a URL. curl also supports user and password in HTTP URLs, thus you can pick a file like: or specify user and password separately like in. Using curl's option --verbose (-v as a short option) displays what kind of commands curl sends to the server, as well as a few other informational texts. curl is a powerful tool that has a wide range of options. Using Curl on z/OS Curl (Client URL) is a powerful command-line tool that allows you to transfer data to and from servers that use various protocols. Mar 12, 2025 · To allow receiving compressed data, used the --compressed option, or define the Accept-Encoding header. Typically, curl automatically extracts the public key from the private key file, but in cases where curl does not have the proper library support, a matching public key file must be specified using the --pubkey option. Tagged with curl, api, beginners, webdev. Let’s make a request using curl for calling an HTTPS endpoint: curl https://www. cURL is a computer software project providing the libcurl library and curl command-line tool for transferring data such as downloads and uploads using various network protocols. Trusted CA Signed SSL Certificates The simplest syntax to use with curl is curl <URL>. I wrote my POST code at the Java side. Jan 30, 2019 · `curl -v` displays HTTP headers but not the complete request body. It is a file transfer command-line tool powered by libcurl, a free client-side URL transfer library. Jul 14, 2023 · In this article we have explained a brief history of the origins of curl and explained how to use curl command through 15 practical examples in Linux. 1. First of all, I see c Dec 19, 2024 · The Linux cURL command lets you transfer data with systems. Apr 26, 2025 · cURL Command-line Options The cURL command supports a vast array of command-line options, providing flexibility for various tasks. Feb 1, 2024 · In this tutorial, we will go over how to add headers and parameters to your cURL requests to interact with HTTP-based services effectively. Multiple options are possible using a comma as separator. I am trying to post a JSON d I am new to Curl and Cacerts world and facing a problem while connecting to a server. It supports numerous protocols including HTTP, HTTPS, FTP, and many more. With over 25 million estimated downloads per year, curl is likely the most widely used data transfer tool in the world. Get Help About PowerShell cURL (Invoke-WebRequest) Although I have discussed the syntax and parameters of the cURL command, it is useful to know how to find help for this cmdlet. Oct 24, 2023 · The curl command line tool is used by developers, sysadmins, and power users to transfer data to and from servers. com Jan 17, 2025 · If you are working as a developer or in the support function, you must be aware of cURL command usage to troubleshoot web applications. Let‘s get started! Curl Tutorial for Beginners 1. In this tutorial, we’ll look at how to use curl to invoke an HTTPS endpoint. It supports many protocols Oct 15, 2025 · Curl is a command-line tool in Linux that's used to transfer data over different protocols. It stands for "Client URL" and is commonly utilized for web requests, enabling users to download files, send data via POST requests, and even interact with RESTful APIs directly from the command line. In this tutorial, we’ll Aug 1, 2021 · cURL GET request guide with the most common examples and a description of what each command sample does. The curl supports protocol types like FTP, FTPS, HTTP, HTTPS, IMAP, SCP, SFTP, SMB, TFTP, etc. May 20, 2025 · Documentation: It‘s thoroughly documented with examples for almost every use case For you as a developer or system administrator, curl is invaluable for testing APIs, downloading files, debugging web applications, and automating network-related tasks. The curl command provides The term "curl X" typically refers to using the command-line tool "curl" with the "-X" option to specify the HTTP request method. What is Curl and Why Use It? Curl is a command Learn how to use cURL commands with these top 5 curl examples for beginners. Apr 20, 2024 · 1. If you request a Feb 7, 2025 · Interacting with web services and APIs is a vital skill for developers, system administrators, and anyone who needs to retrieve data from the internet. Interestingly email protocols lşike IMAP, IMAPS, POP3, etc. Jul 28, 2023 · curl: (35) schannel: next InitializeSecurityContext failed - The revocation function was unable to check revocation for the certificate Ask Question Asked 2 years, 4 months ago Modified 3 months ago Dec 7, 2017 · This option allows curl to proceed and operate even for server connections otherwise considered insecure. Like all PowerShell cmdlets, you can use the Get-Help cmdlet to find information about how to use Invoke-WebRequest. In this tutorial, however, we see some of the most common ones. You need to tell the server at least one recipient with --mail-rcpt. are supported by the curl command too. cURL is a cross-platform utility means you can use on Windows, MAC, and UNIX. NET on Windows that provides a web service. While using APIs, it’s essential to know how to include authentication credentials securely and reliably. Apr 11, 2012 · cURL is a software package which consists of command line tool and a library for transferring data using URL syntax. I have a URL to which I Oct 21, 2016 · We’ll show you 5 basic cURL command examples, and explain them in detail. pem https://example. PowerShell cURL cURL has been around since 1997 and is used to interact with web services, to send or retrieve data. ch What you see will depend on the content type of the URL. It can come in handy when downloading files and troubleshooting connectivity issues from the command line. Using the curl Command The curl command is used to transfer data from or to a server using various protocols like HTTP, HTTPS, FTP, and more. Jul 11, 2025 · This book has given an in-depth elaboration of what curl can do, how it works, and its various applications, highlighting the need for Linux users seeking full command line utility. This article provides 15 practical cURL usage examples. Mar 31, 2024 · Learn some essential and some pro tips and tricks about using the Curl command in Linux. Feb 1, 2024 · Introduction cURL is a powerful command-line tool used to transfer data to or from a server. In your example, it just send a . I am new to Curl and Cacerts world and facing a problem while connecting to a server. In this comprehensive […] Dec 10, 2008 · There is a good way to learn how to use curl for http requests by examples. Oct 31, 2022 · Curl is a free and open source software we can use to exchange data with servers using one of the many supported protocols, such as HTTP, HTTPS, FTP, FTP, SFTP. Download the newest version of Postman, make any http request configuration as you wish at user interface level (post, put, get. The HTTP POST method is used to send data to the remote server. com Learn how to use the popular command-line tool Curl to access different ports on your server or network. Basic GET Request The simplest way to use cURL is to fetch a webpage: Use case: Quickly check if […] Jul 14, 2023 · To make a GET request using Curl, run the curl command followed by the target URL. When sending SMTP with curl, there are two necessary command line options that must be used. However, I want to test it with cURL. Curl allows you to download or upload files, interact with APIs, send emails, and automate tasks. cern. PowerShell `curl` is a command that allows you to transfer data using various network protocols, enabling users to interact with REST APIs and download files easily. When specifying multiple -d options on the command line, curl concatenates them and insert ampersands in between, so the above example could also be written like this: Nov 18, 2010 · How would I pass multiple values in the header for a curl request? Apr 25, 2025 · The Linux cURL command lets you transfer data with systems. Apr 26, 2010 · Is there a way to install cURL in windows in order to run cURL commands from the command prompt? Apr 18, 2011 · I'm using curl at the command line on Linux to issue HTTP requests. The Curl command-line tool provides several advanced options such as user authentication, proxy support, resuming transmission, limiting bandwidth and transfer rates, and more. Understanding cURL Syntax Before we add headers and parameters, let’s understand the basic syntax of cURL. curl supports various network protocols and can operate without interacting with the user. Short for "Client URL," curl is an open-source command-line tool and library designed for transferring data using a variety of network protocols. Dec 19, 2023 · To send a Curl POST request, you need to pass the POST data with the -d command line option, and the authorization header and bearer token are passed with the -H command line option. Otherwise, perhaps curl doesn't like the certificate for some reason. In this article, you will learn how to use curl in Windows with various examples Feb 21, 2023 · Curl is a popular command-line utility for transferring data to or from a server using over 25+ protocols. It's a versatile tool for downloading files, testing APIs, and more. --verbose is the single most useful option when it comes to debug or even understand the curl<->server interaction. The curl command can handle a wide range Nov 7, 2024 · The Linux curl command supports numerous protocols for data transfer to and from a server. for instance, with headers and json body ) and then click in "generate code" and choose "curl" option. Oct 9, 2025 · If you’ve ever worked on the command line and needed to test an API, download a file, or just peek under the hood of a website—chances are you’ve met curl. Feb 10, 2023 · Learn how to use curl to make quick and easy REST API requests from the command line in this beginner-friendly guide. Here's a simple code snippet showcasing how to use `curl` in PowerShell to fetch the content of a webpage: curl https://www. May 31, 2022 · 1. Want to test just a specific type of compression, define the header and tell what you support. How can I call the web service in Linux with cURL? May 3, 2024 · How do I pass authorization header using cURL? ( executable in /usr/bin/curl). 5 days ago · Learn the cURL command in Linux with practical examples for downloads, API requests, authentication, debugging, and network control. Aug 13, 2024 · The curl command is a powerful and versatile tool used to transfer data to or from a server using various protocols, such as HTTP, HTTPS, FTP, and more. Nov 14, 2024 · In this article, I will explain how you can use cURL in PowerShell, and give you some examples. Its versatility and comprehensive HTTP implementation mean that, if there’s a URL for it, curl can do it. Overview curl is a command-line tool that supports many web protocols like HTTPS. You need to have your client certificate already Oct 1, 2013 · I used this syntax to post a file along with some parameters: curl -v -include --form "key1=value1" --form upload=localfilename URL The file is around 500K in size. There are many use-cases Curl can cover. com What is Curl? `curl` is a command-line tool that enables users to transfer data to or from a Oct 9, 2025 · cURL is a powerful command-line tool for transferring data with URLs. Since Curl is a command line tool, we can use it in our scripts, to automatize repetitive tasks, for example. Explore curl command examples and converted code samples. This Curl cheat sheet contains commands and examples of some common Curl tricks. It supports many common internet protocols including HTTP, HTTPS, FTP, FTPS, SFTP, SCP, SMTP, POP3, IMAP, LDAP, MQTT, TELNET and more. May 26, 2025 · Learn how to download files using cURL from the command line. It gives you the equivalent command line. From GET requests to file uploads and HTTP headers, this guide covers practical examples to enhance your command-line skills. The following are some of the most used syntaxes with an example to help you. See full list on linuxize. Feb 1, 2024 · For many developers and system administrators, cURL is an invaluable tool for testing HTTP requests, including POST requests, and for uploading files to a server. tech fetches IP address details in JSON format, just like visiting the site in a browser. However, the man page does mention using multiple -o options for multiple URLs to download, so it might be more useful in that context. A command line that uses a client certificate specifies the certificate and the corresponding key, and they are then passed on the TLS handshake with the server. <address> should be one of: This Curl cheat sheet contains commands and examples of some common Curl tricks. May 27, 2020 · In this article, we're going to discuss how to use Curl to interact with RESTful APIs. CURL to download a directory Ask Question Asked 15 years, 1 month ago Modified 4 years, 2 months ago Nov 3, 2024 · Learn how to troubleshoot and resolve the "Curl error (6): Couldn't resolve host name" issue on Super User forum. The "curl" command is a widely used tool for making HTTP requests from the command line. Feb 22, 2025 · The curl command-line tool is one of the most useful and versatile programs you can learn. Sep 17, 2008 · The cURL tutorial on HTTP Scripting is also helpful for emulating a web browser. If you’d like to find out more about cURL Jun 22, 2025 · Learn 9 powerful curl command examples with syntax, options & real use cases. example. The server connection is verified by making sure the server's certificate contains the right name and verifies successfully using the cert store. -s or --silent: This option runs the command in the background silently, without displaying progress, but the result of the command will be shown. cURL, which stands for ‘Client URL’, is a command-line tool and library that can send requests to and fetch data from servers, using a number of different protocols such as HTTP Learn how to use cURL on Windows and PowerShell. This said, we can guess what a . This option makes curl use active mode. baeldung. I want to test my Spring REST application with cURL. Mar 28, 2021 · (curl -o- and curl -o - act the same. The curl command is a useful tool for transferring data to and from a server. With libcurl, use the curl_formadd() function to build your form before submitting it in the usual way. Nov 7, 2024 · The Linux curl command supports numerous protocols for data transfer to and from a server. These hosts are generally called servers where different protocol types are supported by curl. It supports […] Jan 7, 2025 · Linux curl Command: Syntax, Options, and Examples Introduction In the realm of command-line utilities, few tools are as versatile and powerful as curl. When specifying multiple -d options on the command line, curl concatenates them and insert ampersands in between, so the above example could also be written like this: Nov 18, 2010 · How would I pass multiple values in the header for a curl request? To ensure curl's behaviour is not affected by any environment variables - you should run the command prefixed with env -i which will clear the environment for the invocation of curl: Jan 4, 2024 · In this article we learned how to properly perform a curl POST request with practical examples Client certificates TLS client certificates are a way for clients to cryptographically prove to servers that they are truly the right peer (also sometimes known as Mutual TLS or mTLS). Dec 17, 2024 · Each example above demonstrates how curl can be harnessed to perform specific tasks efficiently, making it a must-have for professionals dealing with web technologies. This guide covers syntax, authentication, HTTP/FTP downloads, headers, and resume tips. Perfect for mastering curl in Linux, terminal, or bash scripts. Curl automatically selects the HTTP GET request method unless you use the -X, --request, or -d command-line option. CURL cURL stands for ( Client for URLs) and is a command line tool and library for transferring data with URLs. gejoqrjosvejpolxhhhptakhxdjiqlmzjjplqbqoygdxhjtgflhelltxqkropofoknafzks