-T <\/strong>option like so:<\/p>curl -T \/path\/to\/file ftp:\/\/ftp.example.com\/remote\/path\/<\/pre>For a secure file transfer protocol (SFTP) or protected FTP server, add the authentication credentials before the -T<\/strong> option like so:<\/p>curl -u username:password -T \/path\/to\/file sftp:\/\/sftp.example.com\/remote\/path\/<\/pre>Using custom request headers lets you interact with the web server or API in a specific way. It enables you to add specific metadata for a personalized response, which is useful when testing the endpoint’s functionality.<\/p>
You can set a custom header with the -H <\/strong>option using this syntax:<\/p>curl -H \"Header: value\" <URL><\/pre>For example, you can specify the type of content you want to send in the header. Here’s the command:<\/p>
curl -X POST -H \"Content-Type: application\/json\" -d '{\"form\":\"JSONdata\"}' https:\/\/api.example.com\/<\/pre>You can also set a custom header to define the type of content you accept as a response. For example, if you want the endpoint to respond with JSON, use the following:<\/p>
curl -H \"Accept: application\/json\" https:\/\/api.example.com\/data<\/pre>When testing API, you can set a custom header to specify the version to use. The command looks like this:<\/p>
curl -H \"X-API-Version: 2\" https:\/\/api.example.com\/v2\/data<\/pre>Using different protocols<\/h3>
Depending on the endpoint, you might need to use different protocols with cURL. For example, you might want to use SFTP to transfer files while testing a mailing server requires SMTP.<\/p>
To run cURL using different protocols, simply specify it at the beginning of your endpoint’s URL before :\/\/<\/strong>. For example, this command will transfer data using SMTP:<\/p>curl --url smtp:\/\/smtp.example.com --mail-from \"user@example.com\" --mail-rcpt \"recipient@example.com\" -T email.txt<\/pre>The command will send a message from user@example.com<\/strong> to recipient@example.com<\/strong> via the smtp.example.com<\/strong> mailing server using the SMTP protocol.<\/p>Conclusion<\/h2>
The cURL command in Linux lets your system connect to and transfer data with a server. It is known for its compatibility with various protocols and ability to include additional information, like a custom header.<\/p>
While cURL is pre-installed in most Linux distributions, you can configure it manually using your package manager. The basic usage of this command is to fetch a web page’s content or an API response.<\/p>
You can also download files using cURL with the -O<\/strong> option or upload items by adding the -F <\/strong>flag. Moreover, use -H<\/strong> to specify a custom request header for various purposes, including adding an authentication token and specifying the API version.<\/p>To send form data using cURL, use the -d <\/strong>option. Meanwhile, add the -F<\/strong> flag to upload more complex resources like files.<\/p>
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