Curl commands


curl is a command-line utility for transferring data from or to a server designed to work without user interaction. With curl, you can download or upload data using one of the supported protocols including HTTP, HTTPS, SCP , SFTP , and FTP . curl provides a number of options allowing you to resume transfers, limit the bandwidth, proxy support, user authentication, and much more. 



To Print the header:

Use the -I option to fetch only the HTTP headers of the specified resource.

    curl -Is http://linux.com/

    curl -I --http2 https://www.ubuntu.com/


With Proxy:

curl supports different types of proxies, including HTTP, HTTPS and SOCKS. To transfer data through a proxy server, use the -x (--proxy) option, followed by the proxy URL.

    curl -x 192.168.44.1:8888 http://linux.com/


With Proxy & Username/Password:

If the proxy server requires authentication, use the -U (--proxy-user) option followed by the user name and password separated by a colon (user:password):

    curl -U username:password -x 192.168.44.1:8888 http://linux.com/

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