官方网址：
https://curl.se/

command line tool and library for transferring data with URLs

What's curl used for?
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.
curl is used daily by virtually every Internet-using human on the globe.