Curl flag. 1 day ago · List of `curl` options.

Curl flag However, with the flag --request, you are setting the HTTP method from POST to PROPFIND and sending the request to url. If you just activate it, you can have curl receive and send cookies exactly as mandated in the specs. There's nothing wrong with being able to find quick answer to succinct question on SO in general. Syntax: curl -o [file_name] [URL] Example: Many options and URLs As mentioned above, curl supports hundreds of command-line options and it also supports an unlimited number of URLs. / en / cheatsheets / curl Cheatsheet - curl Common options Related to headers: -I: get header only. Read this tutorial for detailed instructions on sending POST requests with cURL. Learn how to use curl to view web pages, download files, display response headers, and download and upload files to an FTP server. number 1462299217 - expires at - seconds since Jan 1st 1970, or 0 string person - name of the cookie string daniel - value of the cookie Cookies with curl the command line tool curl has a full cookie "engine" built in. curl supports over two hundred different options. Name curl - transfer a URL Synopsis curl [options / URLs] Description curl is a tool for transferring data from or to a server using URLs. Like you can ask curl to switch on verbose mode with the -v The one-page guide to Curl: usage, examples, links, snippets, and more. curl parses the entire command line first, apply the wishes from the command-line options used, and then go over the URLs one by one May 15, 2024 · Curl supports over 380 command-line flags that can be used to customize every aspect of Curl. In this tutorial, we will show you how to use the curl tool through practical examples and detailed explanations of the most common curl options. js, Curl/Bash, Python, Java, C#/. Learn Linux's curl command with real-world examples. In this article, we’ll guide you through using cURL to test your website and explain three common flags: -v, -i, and -k. From GET requests to file uploads and HTTP headers, this guide covers practical examples to enhance your command-line skills. If all recipients trigger RCPT TO failures and this flag is specified, curl still aborts the SMTP conversation and returns the error received from to the last RCPT TO command. Requests to web resources are served over the http protocol via curl. Essential cURL options and flags guide: data, headers, methods, output, authentication, redirects, forms, timeouts, and cookies for developers. This is an alternative option to -f, --fail which makes curl fail for the same circumstances but without saving the content. I get the http headers with the command Verbose If your curl command does not execute or return what you expected it to, your first gut reaction should always be to run the command with the -v / --verbose option to get more information. com Retry on any and all errors The most aggressive form of retry is for the cases where you know that the URL is supposed to work and you do not tolerate any failures. Your machine may have several IP-addresses and/or network interfaces and curl allows you to select which of them to use. Command line options: -b Jan 26, 2025 · In conclusion, using cURL to ignore SSL certificate validation is a straightforward process that involves the -k flag. The man pages explains it, but it doesn't make a lot of sense to me. Example Make a curl request to google. The following are some of the most used syntaxes with an example to help you. It can download a URL from a web server over HTTP, and supports a variety of other network protocols, URI schemes, multiple versions of HTTP, and proxying. This page covers some essential cURL commands, common flags, and their usage. The curl command, a versatile tool for making HTTP requests, offers the -u option to simplify the process of including user credentials in your requests. Download the newest version of Postman, make any http request configuration as you wish at user interface level (post, put, get. First, curl --help or simply curl -h get you a list of the most important Mar 16, 2025 · Name curl - transfer a URL Synopsis curl [options / URLs] Description curl is a tool for transferring data from or to a server using URLs. e: curl hos 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. This flag tells Curl to resend the request to the new address. However, most are not useful for everyday tasks. If the response code was any other 3xx code, curl will re-send the following request using the same unmodified method. curl is also libcurl, used in cars, television sets, routers, printers, audio equipment, mobile phones, tablets, medical devices, settop boxes, computer games, media players and is the Internet transfer engine for countless software applications in over twenty billion installations. Like you can ask curl to switch on verbose mode with the -v curl is used in command lines or scripts to transfer data. In situations like this, you can use the --proxy-insecure flag together with the -k / --insecure flag above to Mar 22, 2023 · As cURL was celebrating its 25th birthday, I was reading Daniel Stenberg’s story behind the project, and discovered a neat little feature I hadn’t heard of before: the --json flag! Daniel even blogged about it when it landed in cURL 7. This guide covers syntax, authentication, HTTP/FTP downloads, headers, and resume tips. Covering a wide range of curl options, tricks, and tips. I use curl to get http headers to find http status code and also return response. curl How to Use Curl -v Command, A Complete Guide curl is a powerful command-line tool for HTTP requests, supporting various protocols. The "curl" command is a widely used tool for making HTTP requests from the command line. com If you need to add multiple headers, you can repeat the -H flag as many times as necessary BY SETH KENLON Curl is is a tool to transfer data to and from a server, supporting protocols including HTTP, FTP, IMAP, LDAP, POP3, SCP, SFTP, SMB, SMTP, and more. When do you use which of them? As described in the chapters mentioned above, both these options send the specified data to the server. com receiving an HTML object as a response. Often used: -sSL -L follow location change (3XX response code) -S print error -s Silent or quiet mode. This causes curl to POST data using the Content-Type multipart/form-data according to RFC 2388. The project consists of a library (libcurl) and command-line tool (curl), which have been widely ported to Jun 25, 2014 · explanation : -v (--verbose flag) is useful for debugging and getting extra information about the response from server. Learn how to use curl. TLS Certificate Verification Native vs file based If curl was built with Schannel support, then curl uses the Windows native CA store for verification. art The stages to completing the HTB Web Requests Capture The Flag (CTF) challenge will be discussed in this article. mk-ca-bundle is a separate tool, used to get a CA bundle. Nov 7, 2024 · The Linux curl command supports numerous protocols for data transfer to and from a server. To familiarize yourself with a few of curl's options, please read this article. Is there a way I can I make cURL fail with Jan 31, 2024 · Bypassing an insecure proxy with cURL There are situations where you are making a cURL request through a proxy server and the problematic certificate is not from the final endpoint you are requesting, but it is rather a problem with the intermediate proxy-server’s certificate. Auth -u Name curl - transfer a URL Synopsis curl [options / URLs] Description curl is a tool for transferring data from or to a server using URLs. To be able to automatically extract information from the web, to fake users, to post or upload data to web servers are all important tasks The term "curl X" typically refers to using the command-line tool "curl" with the "-X" option to specify the HTTP request method. A similar problem arises if using environment variables with e. You do this by writing first the option and then the argument, separated with a space. Useful for debugging and seeing what's going on "under the hood". Learn how to use curl and its options. Single v is just Enough. I found a command that uses it as a DNS resolver i. Requests to web resources are May 17, 2024 · The cURL tool is a well-known tool for transferring data across networks, based on the libcurl library. I also did manage to find the --data flag in the manual: -d, --data <data> (HTTP) Sends the specified data in a POST request to the HTTP server, in the same way Help curl has more than two hundred and sixty command-line options and the number of options keep increasing over time. To make sure you comprehend the answer, we’ll dissect every facet of the problem in great depth. Apr 25, 2025 · The Linux cURL command lets you transfer data with systems. com. Background cURL is free software that allows you to transfer between servers. The increasing amount of applications moving to the web has made "HTTP Scripting" more frequently requested and wanted. Short options Command line options pass on information to curl about how you want it to behave. While this approach can simplify interactions during development and testing, it is crucial to recognize the associated risks and to limit its use strictly to non-production environments. These flags will help you gather detailed information, view headers, or bypass SSL verification when troubleshooting. Jul 17, 2025 · 4. The -v option activates verbose mode, revealing detailed communication logs between the client and server. For now Mar 17, 2023 · Useful curl flags for HTTP requests 17 Mar 2023 curl As curl is a powerful tool, it also has many flags. curl --retry 5 --retry-connrefused https://example. May 15, 2024 · Curl supports over 380 command-line flags that can be used to customize every aspect of Curl. If you're not familiar with it, allow me to introduce you. -d skips over the carriage returns and newlines so you need to use --data-binary if you rather intend them to be included in the Sep 12, 2023 · quoting the curl documentation: -o, --output Write output to instead of stdout. This article provides a list of the most commonly used Curl flags with short descriptions that you can use in your projects. Using --retry-all-errors makes curl treat all transfers failures as reason for retry. Verification Every trusted server certificate is digitally Arguments to options Not all options are just simple boolean flags that enable or disable features. Features -- what curl can do curl tool config file support multiple URLs in a single command line range "globbing" support: [0-13], {one,two,three} multiple file upload on a single command line redirect stderr parallel transfers libcurl URL RFC 3986 syntax custom maximum download time custom lowest download speed acceptable custom output result after completion guesses protocol from hostname Jul 17, 2023 · Created by Lexia. 1 day ago · List of `curl` options. It adds informational tests and prefix them with '*'. Simply put, cURL is a command-line tool that allows you to transfer data from one point to another. Oct 16, 2025 · Curl ignore invalid and self signed ssl certificate: Explains how to force curl command to ignore SSL certification warning for domain/IP 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. The curl command is one of the most powerful and useful tools used by web developers as well as by PHP programmers and system administrators. In this article, you will learn how to use curl in Windows with various examples Jun 27, 2025 · cURL is a lightweight yet powerful tool for sending POST requests from CLI. It is highly popular for automation and scripts due to its wide range of features and protocol support. . curl is powered by libcurl for all transfer Nov 27, 2019 · Curl is a command-line utility for transferring data from or to a server designed to work without user interaction. For example: retry up to 12 times for all errors: adapted in part from the blog post Curling - exploring web request options Most times you request data from the web, you should have no problem. Don't show progress meter or error messages. -d, --data <data> (HTTP) Sends the specified data in a POST request to the HTTP cause curl to pass the data to the server using the content-type -d, --data is the same as --data-ascii. Verify if you can connect to the URL Mar 24, 2021 · Whenever your have a doubt use man. This enables uploading of binary files etc. May 10, 2024 · Learning to automate server requests flexibly but don’t know where to start? Pick up this curl cheat sheet and see curl operations in action. Furthermore, we can find curl in the repositories of most distributions. Single page documents with the most important curl options explained Download Download View curl-cheat-sheet on GitHub May 15, 2024 · Curl's possibilities are endless, and it is easy to get lost in many flags. : curl Dec 7, 2017 · When you use curl to access a web page it is actually sending the GET request to the server. GitHub Gist: instantly share code, notes, and snippets. I agree with you, but only because explainshell is perfectly suitable for this type of questioning. Curl is a linchpin for transferring data between local and remote systems. The difference is in how the data is formatted over the wire. The command sends a POST with contents <xml> and MIME type text/xml. Besides the HTTP (S) protocol, many other network protocols are supported, like FTP, IMAP, LDAP, and SMB. For some of them you need to pass on data, like perhaps a username or a path to a file. NET code snippets using the ReqBin code generator. Issue man curl and read about -d switch. In this guide, A single page document with the most important curl options for HTTP explained - curl/curl-cheat-sheet Jul 20, 2023 · Generate Code Snippets for Curl -k Flag Example Convert your Curl -k Flag request to the PHP, JavaScript/AJAX, Node. (SSL) This option explicitly allows curl to perform "insecure" SSL connections and transfers. Chances are the number of options reaches or even surpasses three hundred in the coming years. curl sends exactly the bytes you give it (except that when reading from a file. Jul 11, 2025 · In this case, the `-d` flag is used to send data to be sent with the request. Like, for example, if you want to send an arbitrary string of data in an HTTP POST to a server: Sep 16, 2013 · The --data flag is for defining POST data. or 524 response code. Apr 18, 2019 · When used in Bash scripts or running cURL via the command line manually, you wouldn't want to have to handle these redirects manually, otherwise it could add a lot of unnecessary logic to your script. cURL cURL is an invaluable tool in any webapp pentester's repertoire. Let Jun 2, 2012 · From man curl: -F, --form <name=content> (HTTP) This lets curl emulate a filled-in form in which a user has pressed the submit button. 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. Curl is designed to work without user interaction, supports many popular Internet protocols, and runs on most modern operating systems. Libcurl is a development library while curl is a command-line interface tool. Most of the time, the receiving end is written to expect a What is -u flag on cURL actually doing? Asked 9 years, 9 months ago Modified 3 years, 2 months ago Viewed 32k times Nov 18, 2010 · How would I pass multiple values in the header for a curl request? Organic, nutritious, and completely irresistible curl recipes that show you how to debug curl requests to see what it's sending and receiving. Jan 10, 2023 · Generate Code Snippets for Curl -u Flag Example Convert your Curl -u Flag request to the PHP, JavaScript/AJAX, Node. List options To find out which options you need to perform a certain action, you can get curl to list them. Check out this article to learn more about its usage and its real-world examples. When were each command line option added to curl. However, you eventually will run into problems. 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. 0 last year. Note that we cannot cover all of the available options as there are over 170 curl command-line flags. How to use libcurl. g. The cURL project offers two sub-p Name CURLOPT_UPLOAD_FLAGS - upload flags for IMAP Synopsis #include <curl/curl. It’s pre-installed on many Linux distributions. Commonly used cURL flags. Command line options When telling curl to do something, you invoke curl with zero, one or several command-line options to accompany the URL or set of URLs you want the transfer to be about. To download a file, you simply provide the URL of the file as the argument: -o: saves the downloaded file to the local host with the specified name in parameters. Feb 1, 2024 · To add a header to your HTTP request, you can use the -H or --header flag followed by the header you’d like to add. How to build them from source or perhaps how the curl project accepts contributions. Mar 22, 2021 · Name curl - transfer a URL Purpose To craft HTTP(s) requests and receive HTTP(s) responses allowing transference of data to or from a server. In this guide, we’ll delve into cURL’s capabilities and cURL request formatting Depending on the command line tool you use, the format in which you use cURL to make API requests will differ. Below is a cheat sheet of the most common flags with simple examples: -d, --data <data> - to add add to POST body curl --data "ok" https Installing and using curl On this page Using curl Using curl in Windows Replace line-ending backslashes Move JSON data to a file Installing curl macOS Windows 10, version 1803 or later Windows Testing your curl installation Common curl flags When curl follows a redirect and the request is not a plain GET (for example POST or PUT), it will do the following request with a GET if the HTTP response was 301, 302, or 303. curl options Scott Chamberlain 2025-07-17 adapted in part from the blog post Curling - exploring web request options Most times you request data from the web, you should have no problem. Nov 12, 2022 · How to make Curl follow redirects? To follow redirect with Curl, use the -L or --location command-line option. Mar 12, 2025 · This curl cheat sheet contains commands and examples of common tasks that can be performed with curl. From Curl documentation : -v, --verbose Makes curl verbose during the operation. May 14, 2024 · cURL is a versatile command-line tool for transferring data with URLs, supporting various protocols like HTTP, FTP, and more. In addition, there are advanced things you can do modifying requests to web resources that fall in the advanced stuff category. In pentesting, it is mostly used in the context of interacting with web servers. Overrides -n, --netrc and --netrc-optional. The use of the -k or –insecure flag and similar settings in programming environments should be approached with caution and a deep cURL (pronounced like "curl", [6] / kɜːrl /) is a free and open source CLI app for uploading and downloading individual files. Feb 23, 2024 · Conclusion In conclusion, bypassing SSL/TLS certificate verification with curl, while necessary in certain development, testing, and troubleshooting scenarios, carries significant security risks such as Man-in-the-Middle attacks and compromised data integrity. Challenge Overview The HTB Web Requests CTF challenge consists of several tasks that involve interacting with a web server using cURL and browser devtools. By using --retry-delay you disable this exponential backoff algorithm. h> CURLcode curl_easy_setopt (CURL *handle, CURLOPT_UPLOAD_FLAGS, long bitmask); Description Pass a long as parameter, which is set to a bitmask, to tell libcurl which flags to send the server relating to uploaded files. Getting started with cURL cURL is typically pre-installed on Linux and macOS systems. 82. () Specifying the output as '-' (a single dash) passes the output to stdout. In this article, we'll explore the curl -u command, its syntax, and how it enhances the efficiency of handling authentication. Usage curl [url] Make and receive web requests. All SSL connections are attempted to be made secure by using the CA certificate bundle installed by default. Here is the most basic syntax you should follow when using it: curl <option> <URL> May 15, 2024 · Curl supports over 380 command-line flags that can be used to customize every aspect of Curl. Overview This article explains how to use the command-line curl tool at DreamHost. If you are working as a developer or in the support function, you must be aware of cURL command usage to troubleshoot web applications. This post will provide a concise exploration of the "curl -o" command in Linux. Bash Windows command line Terminal (macOS) Bash When using bash command line, format your cURL requests according to the following guidelines. Here’s the general syntax: curl -H "Header-Name: header value" [URL] For instance, to add a custom user-agent, you could use: curl -H "User-Agent: MyCustomAgent" https://example. May 26, 2025 · Learn how to download files using cURL from the command line. --data-raw is almost the ter. Bonus Outside of making general web requests curl is great for debugging and troubleshooting web application servers and APIs. When curl is about to retry a transfer, it first waits one second and then for all forthcoming retries it doubles the waiting time until it reaches 10 minutes, which then remains the set fixed delay time between the rest of the retries. cURL is a cross-platform utility means you can use on Windows, MAC, and UNIX. The book: Everything curl This is a detailed and totally free book, available online (and as a PDF as a link from there) that explains everything there is to know about curl, libcurl and the associated project. To force the 'content' part to be a file, prefix the file name with an @ sign. curl is powered by libcurl for all transfer -d vs -F Previous chapters talked about regular POST and multipart formpost, and in your typical command lines you do them with -d or -F. Most commonly, it is used to transfer data between remote and local systems. for instance, with headers and json body ) and then click in "generate code" and choose "curl" option. All other TLS libraries use a file based CA store by default. One of the most versatile and powerful tools for this purpose is cURL. When verbose mode is enabled, curl gets more talkative and explains and shows a lot more of its doings. -o- is equivalent to -o - and means write the output to stdout (writing to stdout is the default anyway, but it allows you to be explicit about writing to stdout, instead of writing to curl default, which happens to be stdout The -P flag to curl supports a few different options. curl is also generally used to download a file from the web. curl is a powerful tool, please use it responsibly, regularly and repeatedly downloading files from the same website can result in your IP being automatically flagged/blocked. If your shell or command-line system supports it, there is really no limit to how long a command line you can pass to curl. Jan 17, 2025 · cURL is a command-line tool to get or send data using URL syntax. curl is powered by libcurl for all transfer Dec 10, 2008 · There is a good way to learn how to use curl for http requests by examples. Curl's possibilities are endless, and it is easy to get lost in many flags. See your command line tool below for the cURL syntax to use when making requests to Oracle Eloqua's APIs. It supports these protocols: DICT, FILE, FTP, FTPS, GOPHER, GOPHERS, HTTP, HTTPS, IMAP, IMAPS, LDAP, LDAPS, MQTT, POP3, POP3S, RTMP, RTMPS, RTSP, SCP, SFTP, SMB, SMBS, SMTP, SMTPS, TELNET, TFTP, WS and WSS. For example, let's see what curl might Dec 16, 2024 · Explore 20 essential curl commands for developers and sysadmins. A line starting with '>' means "header data" sent by curl, '<' means "header data" received by curl that This curl method keeps credentials out of the history and process status, but leaves username and password in cleartext in the my-password-file creating another attack vector - worse than than having info in the history file: bash, for example, automatically restricts permissions of the history file. This flag allows curl to output and save that content but also to return error 22. This Curl cheat sheet contains commands and examples of some common Curl tricks. Because of this, cURL offers a command line flag that tells it to automatically follow the redirect and return the resolved endpoint and its data: curl is a tool to transfer data from or to a server, using one of the supported protocols (HTTP, HTTPS, FTP, FTPS, SCP, SFTP, TFTP, DICT, TELNET, LDAP or FILE). On Apple operating systems, it is possible to use Apple's "SecTrust" services for certain TLS backends, details below. In this tutorial, we’ll learn how to use the curl command curl HTTP cheat sheet Curl is the swiss army knife for gathering information while troubleshooting websites. When you send a POST request, and the server responds with one of the codes 301, 302, or 303, Curl will make the subsequent request using the GET method. There are other kinds of request that can be used and -X is the way to specify this. There are many ways to use curl and this guide is simply documenting the ones I often use, but can never seem to remember the specific flags. The current supported flags are CURLULFLAG_ANSWERED, which sets the Answered flag for IMAP While the server might assume that the data is encoded in some special way, curl does not encode or change the data you tell it to send. -H: send with extra header. a script to set the username I was always assuming that when curl got an HTTP 500 response it was returning an exit code that meant failure (!= 0), but that seems to be not the case. -sS: disable progress meter but still show error messages. Read the full reference man page, read the tutorial or learn how to do HTTP scripting with curl. From cUrl docs: -u, --user <user:password;options> Specify the user name, password and optional login options to use for server authentication. The main tool to know and learn here is of course curl. To post data purely binary, you should instead use the [] It allows you to send ASCII data, eg. See how curl compares to alternative tools. When telling curl to do something, you invoke curl with zero, one or several command-line options to accompany the URL or set of URLs you want the transfer to be about. According to ChatGpt, it has over 240 options. Oct 10, 2023 · I feel like this is a new flag, there's not much about it online. It gives you the equivalent command line. So what’s so cool about it? The Art Of Scripting HTTP Requests Using curl Background This document assumes that you are familiar with HTML and general networking. Jun 16, 2022 · curl &ndash;insecure example If you&rsquo;re trying to access a website over https URL and curl shows you that certificate has expired or may not be trusted, … Dec 5, 2021 · This article explains how to use curl in Linux with 15 examples. To just get the content part from a file Mar 31, 2024 · Learn some essential and some pro tips and tricks about using the Curl command in Linux. Aug 13, 2017 · Well - this is probably a meta type discussion. clusb pkdbu gztwm dcnufv fcfmi hfmw fipuy wdcc gskinj vnu sgptl kqpb hqfe hoex amul