( like me :) ) - curl official site
curl is used in command lines or scripts to transfer data. curl is also used in cars, television sets, routers, printers, audio equipment, mobile phones, tablets, settop boxes, media players and is the Internet transfer engine for thousands of software applications in over ten billion installations.
oltre che a trasferire è molto utile per debug dialogo client/server http/s
curl -v -I -H "Testing: Test header so you see this works" http://stackoverflow.com/-I, –head
(HTTP FTP FILE) Fetch the headers only! HTTP-servers feature the command HEAD which this uses to get nothing but the header of a document. When used on an FTP or FILE file, curl displays the file size and last modification time only.
-H, –header <header/@file>
eventualmente -X HEAD, mostra intestazioni come tipo richiesta http
